Publications (312)
Neutron spin-echo study of the critical dynamics of spin-5/2 antiferromagnets in two and three dimensions
K. F. Tseng, T. Keller, A. C. Walters +2
We report a neutron spin-echo study of the critical dynamics in the antiferromagnets MnF and RbMnF with three-dimensional (3D) and two-dimensional (2D) spin sys…
Nanoscale layering of antiferromagnetic and superconducting phases in Rb2Fe4Se5
A. Charnukha, A. Cvitkovic, T. Prokscha +10
We studied phase separation in a single-crystalline antiferromagnetic superconductor Rb2Fe4Se5 (RFS) using a combination of scattering-type scanning near-field optical microscopy (…
Ni impurity induced enhancement of the pseudogap in cuprate high T_c superconductors
A. V. Pimenov, A. V. Boris, Li Yu +5
The influence of magnetic Ni and non-magnetic Zn impurities on the normal state pseudogap (PG) in the c-axis optical conductivity of NdBa\{Cu(Ni,Zn)O$_{…
Bond Randomness Induced Magnon Decoherence in a Spin-1/2 Ladder Compound
B. Náfrádi, T. Keller, H. Manaka +3
We have used a combination of neutron resonant spin-echo and triple-axis spectroscopies to determine the energy and linewidth of the magnon resonance in IPA-Cu(ClBr$_{0.05…
Evolution of spin excitations in superconducting LaCaCuO from the underdoped to the heavily overdoped regime
S. Hameed, Y. Liu, M. Knauft +8
We investigate high-energy spin excitations in hole-doped LaCaCuO films across a broad Ca doping range using resonant inelastic x-ray scatter…
Spin-controlled Mott-Hubbard bands in LaMnO_3 probed by optical ellipsometry
N. N. Kovaleva, A. V. Boris, C. Bernhard +5
Spectral ellipsometry has been used to determine the dielectric function of an untwinned crystal of LaMnO_3 in the spectral range 0.5-5.6 eV at temperatures 50 K < T < 300 K. A pro…
Neutron diffraction study of spin and charge ordering in SrFeO(3-delta)
M. Reehuis, C. Ulrich, A. Maljuk +5
We report a comprehensive neutron diffraction study of the crystal structure and magnetic order in a series of single-crystal and powder samples of SrFeO in the vacancy ra…
Imprinted atomic displacements drive spin-orbital order in a vanadate perovskite
P. Radhakrishnan, K. S. Rabinovich, A. V. Boris +6
Perovskites with the generic composition ABO exhibit an enormous variety of quantum states such as magnetism, orbital order, ferroelectricity and superconductivity. Their flexi…
Competing exchange interactions on the verge of a metal-insulator transition in the two-dimensional spiral magnet SrFeO
J. -H. Kim, Anil Jain, M. Reehuis +12
We report a neutron scattering study of the magnetic order and dynamics of the bilayer perovskite SrFeO, which exhibits a temperature-driven metal-insulator transition…
Incommensurate magnetic order and dynamics induced by spinless impurities in YBaCuO
A. Suchaneck, V. Hinkov, D. Haug +8
We report an inelastic-neutron-scattering and muon-spin-relaxation study of the effect of 2% spinless (Zn) impurities on the magnetic order and dynamics of YBaCuO,…
Constituents of the "kink" in high-Tc cuprates
A. A. Kordyuk, S. V. Borisenko, V. B. Zabolotnyy +9
Applying the Kramers-Kronig consistent procedure, developed earlier, we investigate in details the formation of the quasiparticle spectrum along the nodal direction of high-Tc cupr…
Ferromagnetism and Lattice Distortions in the Perovskite YTiO
W. Knafo, C. Meingast, H. v. Löhneysen +7
The thermodynamic properties of the ferromagnetic perovskite YTiO are investigated by thermal expansion, magnetostriction, specific heat, and magnetization measurements. The lo…
Backfolded acoustic phonons in metal-oxide superlattices
F. Lyzwa, A. Chan, J. Khmaladze +5
We report the observation of low-frequency modes in the Raman spectra of thin-film superlattices of the high-temperature superconductor YBaCuO and variou…
Absence of an isotope effect in the magnetic resonance in high- superconductors
S. Pailhès, P. Bourges, Y. Sidis +4
An inelastic neutron scattering experiment has been performed in the high-temperature superconductor to search for an oxygen-isotope shift of the well-known…
Peculiarities of neutron waveguides with thin Gd layer
Yu. Khaydukov, E. Kravtsov, V. Progliado +5
Peculiarities of the formation of a neutron enhanced standing wave in the structure with a thin highly absorbing layer of gadolinium are considered in the article. An analogue of t…
Anomalous electronic Raman scattering in Na_xCoO_2 H_2O
P. Lemmens, K. Y. Choi, V. Gnezdilov +5
Raman scattering experiments on Na_{x}CoO_2 yH_2O single crystals show a broad electronic continuum with a pronounced peak around 100 cm-1 and a cutoff at approximately 560 cm-1ove…
C-axis lattice dynamics in Bi-based cuprate superconductors
N. N. Kovaleva, A. V. Boris, D. Munzar +8
We present results of a systematic study of the c axis lattice dynamics in single layer Bi2Sr2CuO6 (Bi2201), bilayer Bi2Sr2CaCu2O8 (Bi2212) and trilayer Bi2Sr2Ca2Cu3O10 (Bi2223) cu…
Superconductivity drives magnetism in delta-doped La2CuO4
A. Suter, G. Logvenov, A. V. Boris +7
The understanding of the interplay between different orders in a solid is a key challenge in highly correlated electronic systems. In real systems this is even more difficult since…
Momentum and excitation energy dependence of the "waterfalls" in cuprates
D. S. Inosov, J. Fink, A. A. Kordyuk +11
Using high-resolution angle-resolved photoemission spectroscopy we have studied the momentum and photon energy dependence of the anomalous high-energy dispersion, termed "waterfall…
Quantum Impurities and the Neutron Resonance Peak in : Ni versus Zn
Y. Sidis, P. Bourges, H. F. Fong +9
The influence of magnetic (S=1) and nonmagnetic (S=0) impurities on the spin dynamics of an optimally doped high temperature superconductor is compared in two samples with almost i…
Competing spin-orbital singlet states in the 4 honeycomb ruthenate AgLiRuO
T. Takayama, M. Blankenhorn, J. Bertinshaw +25
When spin-orbit-entangled -electrons reside on a honeycomb lattice, rich quantum states are anticipated to emerge, as exemplified by the Kitaev materials. Distinct yet equ…
Electronic and phononic Raman scattering in detwinned YBaCuO and YCaBaCuO: s-wave admixture to the -wave order parameter
M. Bakr, A. P. Schnyder, L. Klam +5
Inelastic light (Raman) scattering has been used to study electronic excitations and phonon anomalies in detwinned, slightly overdoped YBaCuO and moderately overdo…
Comment on "Raman spectroscopy study of NaxCoO2 and superconducting NaxCoO2 yH2O"
P. Lemmens, P. Scheib, Y. Krockenberger +5
The effect of surface degradation of the thermolectric cobaltite on Raman spectra is discussed and compared to experimental results from Co3O4 single crystals. We conclude that on…
From perovskite to infinite-layer nickelates: hole concentration from x-ray absorption
R. Pons, M. Flavenot, K. Fürsich +12
The difficulty of determining cation concentrations and oxygen stoichiometry in infinite-layer nickelate thin films has so far prevented clear experimental identification of the ni…
Odd and even magnetic resonant modes in highly overdoped Bi_2 Sr_2 Ca Cu_2 O_{8+delta}
L. Capogna, B. Fauque, Y. Sidis +9
We present inelastic neutron scattering data on highly overdoped Bi_2 Sr_2 Ca Cu_2 O_{8+δ} single crystals with superconducting transition temperature T_C=70 K and, for comparison…
Neutron scattering study and analytical description of the spin excitation spectrum of twin-free YBa(2)Cu(3)O(6.6)
V. Hinkov, B. Keimer, A. Ivanov +3
We present a comprehensive inelastic neutron scattering study of the magnetic excitations in twin-free YBa(2)Cu(3)O(6.6) (Tc=61 K) for 5 K < T < 290 K. Taking full account of the i…
Electronic phase separation in the slightly underdoped iron pnictide superconductor Ba(1-x)K(x)Fe(2)As(2)
J. T. Park, D. S. Inosov, Ch. Niedermayer +14
Here we present a combined study of the slightly underdoped novel pnictide superconductor Ba(1-x)K(x)Fe(2)As(2) by means of X-ray powder diffraction, neutron scattering, muon spin…
Optical response of ferromagnetic YTiO_3 studied by spectral ellipsometry
N. N. Kovaleva, A. V. Boris, P. Yordanov +8
We have studied the temperature dependence of spectroscopic ellipsometry spectra of an electrically insulating, nearly stoichiometric YTiO_3 single crystal with ferromagnetic Curie…
The magnetic phase diagram of underdoped YBa2Cu3Oy inferred from torque magnetization and thermal conductivity
Fan Yu, Max Hirschberger, Toshinao Loew +11
Strong evidence for charge-density correlation in the underdoped phase of the cuprate YBa2Cu3Oy was obtained by nuclear magnetic resonance (NMR) and resonant x-ray scatter- ing. Th…
Magnetic Proximity Effect in Perovskite Superconductor/Ferromagnet Multilayers
J. Stahn, J. Chakhalian, C. Niedermayer +8
superconducting/ferromagnetic (SC/FM) multilayers have been studied by neutron reflectometry. Evidence for a characteristic difference…
Phonon anomalies in pure and underdoped R{1-x}K{x}Fe{2}As{2} (R = Ba, Sr) investigated by Raman light scattering
M. Rahlenbeck, G. L. Sun, D. L. Sun +3
We present a detailed temperature dependent Raman light scattering study of optical phonons in Ba{1-x}K{x}Fe{2}As{2} (x ~ 0.28, superconducting Tc ~ 29 K), Sr{1-x}K{x}Fe{2}As{2} (x…
Magnetic Order and Dynamics in an Orbitally Degenerate Ferromagnetic Insulator
C. Ulrich, G. Khaliullin, S. Okamoto +6
Neutron scattering was used to determine the spin structure and the magnon spectrum of the Mott--Hubbard insulator YTiO. The magnetic structure is complex, comprising substanti…
Spin and charge excitations in the correlated multiband metal Ca3Ru2O7
J. Bertinshaw, M. Krautloher, H. Suzuki +5
We use Ru -edge resonant inelastic x-ray scattering (RIXS) to study the full range of excitations in CaRuO from meV-scale magnetic dynamics through to the eV-scale…
Magnetic field-enhanced spin freezing in YBa2Cu3O6.45 at the verge of the competition between superconductivity and charge order
T. Wu, H. Mayaffre, S. Krämer +8
Using 63Cu NMR, we establish that the enhancement of spin order by a magnetic field H in YBa2Cu3O6.45 arises from a competition with superconductivity because the effect occurs for…
All-Optical and Microwave-Free Detection of Meissner Screening using Nitrogen-Vacancy Centers in Diamond
D. Paone, D. Pinto, G. Kim +9
Microscopic studies on thin film superconductors play an important role for probing non-equilibrium phase transitions and revealing dynamics at the nanoscale. However, magnetic sen…
Interplay between charge, orbital and magnetic order in Pr_{1-x}Ca_xMnO_3
M. v. Zimmermann, J. P. Hill, Doon Gibbs +6
We report resonant x-ray scattering studies of charge and orbital order in Pr_{1-x}Ca_{x}MnO_3 with x=0.4 and 0.5. Below the ordering temperature, T_O=245 K, the charge and orbital…
Neutron scattering study of the magnetic phase diagram of underdoped YBa(2)Cu(3)O(6+x)
D. Haug, V. Hinkov, Y. Sidis +6
We present a neutron triple-axis and resonant spin-echo spectroscopy study of the spin correlations in untwinned YBCO crystals with x= 0.3, 0.35, and 0.45 as a function of temperat…
Spin-Wave Lifetimes Throughout the Brillouin Zone
S. P. Bayrakci, T. Keller, K. Habicht +1
We use a neutron spin-echo method with eV resolution to determine the lifetimes of spin waves in the prototypical antiferromagnet MnF over the entire Brillouin zone. A theo…
Symmetry of spin excitation spectra in the tetragonal paramagnetic and superconducting phases of 122-ferropnictides
J. T. Park, D. S. Inosov, A. Yaresko +16
We study the symmetry of spin excitation spectra in 122-ferropnictide superconductors by comparing the results of first-principles calculations with inelastic neutron scattering (I…
Energy Gaps and Kohn Anomalies in Elemental Superconductors
P. Aynajian, T. Keller, L. Boeri +2
The momentum and temperature dependence of the lifetimes of acoustic phonons in the elemental superconductors Pb and Nb was determined by resonant spin-echo spectroscopy with neutr…
Optically induced coherent transport far above Tc in underdoped YBa2Cu3O6+x
S. Kaiser, C. R. Hunt, D. Nicoletti +8
We report on a photo-induced transient state of YBa2Cu2O6+x in which transport perpendicular to the Cu-O planes becomes highly coherent. This effect is achieved by excitation with…
Dispersion of the odd magnetic resonant mode in near-optimally doped Bi2Sr2CaCu2O8+d
B. Fauqué, Y. Sidis, L. Capogna +6
We report a neutron scattering study of the spin excitation spectrum in the superconducting state of slightly overdoped Bi2Sr2CaCu2O8+d system (Tc=87 K). We focus on the dispersion…
Magnetic circular dichroism of THz modes and selection rules of Raman-active optical phonons in the polar altermagnet candidate \ce{Mn2Mo3O8}
F. Schilberth, K. Vasin, M. Knauft +14
We investigated the magnetic and vibrational excitations in the collinear altermagnet candidate \ce{Mn2Mo3O8} by temperature dependent Raman scattering and magneto-optical THz time…
Magnetic neutron scattering study of YVO3: Evidence for an orbital Peierls state
C. Ulrich, G. Khaliullin, J. Sirker +5
Neutron spectroscopy has revealed a highly unusual magnetic structure and dynamics in YVO, an insulating pseudocubic perovskite that undergoes a series of temperature induced p…
Superconductivity-Induced Anomalies in the Spin Excitation Spectra of Underdoped YBa_2 Cu_3 O_{6+x}
H. F. Fong, B. Keimer, D. L. Milius +1
Polarized and unpolarized neutron scattering has been used to determine the effect of superconductivity on the magnetic excitation spectra of YBa_2 Cu_3 O_{6.5} (T_c = 52K) and YBa…
Distinct Charge Orders in the Planes and Chains of Ortho-III-Ordered YBaCuO Superconductors Identified by Resonant Elastic X-ray Scattering
A. J. Achkar, R. Sutarto, X. Mao +15
Recently, charge density wave (CDW) order in the CuO planes of underdoped YBaCuO was detected using resonant soft x-ray scattering. An important question remai…
Doping-Dependent Raman Resonance in the Model High-Temperature Superconductor HgBa2CuO4+d
Yuan Li, M. Le Tacon, Y. Matiks +11
We study the model high-temperature superconductor HgBa2CuO4+d with electronic Raman scattering and optical ellipsometry over a wide doping range. The resonant Raman condition whic…
Squeezed Josephson plasmons in driven YBaCuO
N. Taherian, M. Först, A. Liu +10
The physics of driven collective modes in quantum materials underpin a number of striking non-equilibrium functional responses, which include enhanced magnetism, ferroelectricity a…
Plasmon dispersion in bilayer cuprate superconductors
M. Bejas, V. Zimmermann, D. Betto +11
The essential building blocks of cuprate superconductors are two-dimensional CuO sheets interspersed with charge reservoir layers. In bilayer cuprates, two closely spaced CuO$_…
Emergent topological spin structures in a centrosymmetric cubic perovskite
S. Ishiwata, T. Nakajima, J. -H. Kim +18
The skyrmion crystal (SkX) characterized by a multiple-q helical spin modulation has been reported as a unique topological state that competes with the single-q helimagnetic order…
Anisotropic optical response of the mixed-valent Mott-Hubbard insulator NaCu2O2
Y. Matiks, A. N. Yaresko, K. Myung-Whun +4
We report the results of a comprehensive spectroscopic ellipsometry study of NaCu2O2, a compound composed of chains of edge-sharing Cu2+O4 plaquettes and planes of Cu1+ ions in a O…
Thermodynamic evidence for nematic phase transition at the onset of pseudogap in YBaCuO
Y. Sato, S. Kasahara, H. Murayama +8
A central issue in the quest to understand the superconductivity in cuprates is the nature and origin of the pseudogap state, which harbours anomalous electronic states such as Fer…
Phonon scattering and stability of Na_0.5CoO_2
X. N. Zhang, P. Lemmens, V. Gnezdilov +5
Raman scattering experiments have been performed on Na_xCoO_2 as function of temperature at the composition x=0.5 where a structural instability and a metal-insulator transition ha…
Neutron diffraction study of YVO3, NdVO3, and TbVO3
M. Reehuis, C. Ulrich, P. Pattison +7
The structural and magnetic properties of YVO3, NdVO3 and TbVO3 were investigated by single-crystal and powder neutron diffraction. YVO3 shows a structural phase transition at 200…
Spin waves and spin-state transitions in a ruthenate high-temperature antiferromagnet
H. Suzuki, H. Gretarsson, H. Ishikawa +16
Ruthenium compounds play prominent roles in materials research ranging from oxide electronics to catalysis, and serve as a platform for fundamental concepts such as spin-triplet su…
Higgs mode and its decay in a two dimensional antiferromagnet
A. Jain, M. Krautloher, J. Porras +9
Condensed-matter analogs of the Higgs boson in particle physics allow insights into its behavior in different symmetries and dimensionalities. Evidence for the Higgs mode has been…
Doping induced magnetic clusters and Co spin state transition in Na_xCoO_2 with 0.78<x<.97
C. Bernhard, Ch. Niedermayer, A. Drew +7
By muon spin rotation we investigated the magnetic properties of a series of highly Na doped NaxCoO2 single crystals with 0.78(1)<x<0.97(1). Our data provide evidence for an intrin…
Two-fluid dynamics in driven YBaCuO
A. Ribak, M. Buzzi, D. Nicoletti +5
Coherent optical excitation of certain phonon modes in YBaCuO has been shown to induce superconducting-like interlayer coherence at temperatures higher than .…
Two-Dimensional Confinement of 3d1 Electrons in LaTiO3/LaAlO3 Multilayers
S. S. A. Seo, M. J. Han, G. W. J. Hassink +12
We report spectroscopic ellipsometry measurements of the anisotropy of the interband transitions parallel and perpendicular to the planes of (LaTiO3)n(LaAlO3)5 multilayers with n =…
Pseudogap in the chain states of YBCO
V. B. Zabolotnyy, A. A. Kordyuk, D. Evtushinsky +9
As established by scanning tunneling microscopy (STM) cleaved surfaces of the high temperature superconductor YBaCuO develop charge density wave (CDW) modulations…
Two-Dimensional Geometry of Spin Excitations in the High Temperature Superconductor YBa2Cu3O6+x
V. Hinkov, S. Pailhes, P. Bourges +7
The fundamental building block of the copper oxide superconductors is a Cu4O4 square plaquette. In most of these materials, the plaquettes are slightly distorted and form a rectang…
Observation of spin-orbit excitations and Hund's multiplets in CaRuO
H. Gretarsson, H. Suzuki, Hoon Kim +6
We use Ru -edge (2838.5 eV) resonant inelastic x-ray scattering (RIXS) to quantify the electronic structure of CaRuO, a layered -electron compound that exhibits a…
Spectroscopic distinction between the normal state pseudogap and the superconducting gap of cuprate high T_{c} superconductors
Li Yu, D. Munzar, A. V. Boris +6
We report on broad-band infrared ellipsometry measurements of the c-axis conductivity of underdoped RBa_{2}Cu_{3}O_{7-d} (R=Y, Nd, and La) single crystals. Our data provide a detai…
Tailoring the electronic properties of CaRuO via epitaxial strain
C. Dietl, S. K. Sinha, G. Christiani +9
We report the synthesis of CaRuO thin films on NdCaAlO (110), LaAlO (100) and LaSrAlO (001) substrates and show that epitaxial strain induces a transition fro…
Giant phonon anomalies and central peak due to charge density wave formation in YBaCuO
M. Le Tacon, A. Bosak, S. M. Souliou +7
The electron-phonon interaction is a major factor influencing the competition between collective instabilities in correlated-electron materials, but its role in driving high-temper…
Cu-NMR study of oxygen disorder in ortho-II YBa2Cu3Oy
T. Wu, R. Zhou, M. Hirata +12
We show that 63Cu NMR spectra place strong constraints on both the nature and the concentration of oxygen defects in ortho-II YBa2Cu3Oy. Systematic deviation from ideal ortho-II or…
Magnetic excitations and phonons in the spin-chain compound NaCu2O2
K. -Y. Choi, V. P. Gnezdilov, P. Lemmens +6
We report an inelastic light scattering study of single-crystalline NaCuO, a spin-chain compound known to exhibit a phase with helical magnetic order at low temperatures. P…
Structural, magnetic and superconducting characterization of the CuNi/Nb bilayers of the S/F type using Polarized Neutron Reflectometry and complementary techniques
Yu. Khaydukov, R. Morari, L. Mustafa +8
Structural, magnetic, and superconducting properties of S/F bilayers Nb/Cu40Ni60 deposited on silicon substrate have been characterized using Polarized Neutron Reflectometry and co…
Momentum-dependent charge correlations in YBaCuO superconductors probed by resonant x-ray scattering: Evidence for three competing phases
S. Blanco-Canosa, A. Frano, T. Loew +10
We have used resonant x-ray scattering to determine the momentum dependent charge correlations in YBaCuO samples with highly ordered chain arrays of oxygen accepto…
Photoinduced phase switching at a Mott insulator-to-metal transition
K. S. Rabinovich, A. N. Yaresko, R. D. Dawson +5
Achieving fundamental understanding of insulator-to-metal transitions (IMTs) in strongly correlated systems and their persistent and reversible control via nonequilibrium drive are…
Nonlinear lattice dynamics as a basis for enhanced superconductivity in YBa2Cu3O6.5
R. Mankowsky, A. Subedi, M. Först +13
THz-frequency optical pulses can resonantly drive selected vibrational modes in solids and deform their crystal structure. In complex oxides, this method has been used to melt elec…
Enhanced low energy fluctuations and increasing out-of-plane coherence in vacancy ordered NaxCoO2
P. Lemmens, V. Gnezdilov, G. J. Shu +4
We report Raman scattering experiments on the strongly correlated electron system NaxCoO2 with x= 0.71 and ordered Na vacancies. In this doping regime, NaxCoO2 exhibits a large and…
Magnetic-field and doping dependence of low-energy spin fluctuations in the antiferroquadrupolar compound Ce(1-x)La(x)B(6)
G. Friemel, H. Jang, A. Schneidewind +6
CeB(6) is a model compound exhibiting antiferroquadrupolar (AFQ) order, its magnetic properties being typically interpreted within localized models. More recently, the observation…
Two resonant magnetic modes in an overdoped high- superconductor
S. Pailhes, Y. Sidis, P. Bourges +8
A detailed inelastic neutron scattering study of the overdoped high temperature copper oxide superconductor reveals two distinct magnetic resonan…
Single crystal synthesis, structure, and magnetism of PbCu(PO)O
P. Puphal, M. Y. P. Akbar, M. Hepting +4
The recent claim of superconductivity above room temperature in PbCu(PO)O with 0.9 < < 1 (referred to as LK-99) has sparked considerable interest. To minim…
High Temperature Superconductivity in the Cuprates
B. Keimer, S. A. Kivelson, M. R. Norman +2
The discovery of high temperature superconductivity in the cuprates in 1986 triggered a spectacular outpouring of creative and innovative scientific inquiry. Much has been learned…
In-plane anisotropy of spin excitations in the normal and superconducting states of underdoped YBaCuO
V. Hinkov, P. Bourges, S. Pailhes +5
A detailed inelastic neutron scattering study of the in-plane anisotropy of magnetic excitations in twin-free YBaCuO ( 61 K) reveals that the spin excitation…
Crystal structure and high-field magnetism of La2CuO4
M. Reehuis, C. Ulrich, K. Prokes +6
Neutron diffraction was used to determine the crystal structure and magnetic ordering pattern of a La2CuO4 single crystal, with and without applied magnetic field. A previously unr…
Intense paramagnon excitations in a large family of high-temperature superconductors
M. Le Tacon, G. Ghiringhelli, J. Chaloupka +17
In the search for the mechanism of high-temperature superconductivity, intense research has been focused on the evolution of the spin excitation spectrum upon doping from the antif…
Perovskite Substrates Boost the Thermopower of Cobaltate Thin Films at High Temperatures
P. Yordanov, P. Wochner, S. Ibrahimkutty +7
Transition metal oxides are promising candidates for thermoelectric applications, because they are stable at high temperature and because strong electronic correlations can generat…
Strain and composition dependence of the orbital polarization in nickelate superlattices
M. Wu, E. Benckiser, M. W. Haverkort +14
A combined analysis of x-ray absorption and resonant reflectivity data was used to obtain the orbital polarization profiles of superlattices composed of four-unit-cell-thick layers…
Light-Induced Metastable State in Charge-Ordered YBaCuO
H. Gretarsson, S. M. Souliou, S. Jeong +6
We report temporal changes in Raman-scattering spectra of detwinned YBaCuO single crystals under exposure to red laser light polarized along the crystallographic $a…
Helicoidal magnetic order in a clean copper oxide spin chain compound
L. Capogna, M. Mayr, P. Horsch +6
We report susceptibility, specific heat, and neutron diffraction measurements on NaCuO, a spin-1/2 chain compound isostructural to LiCuO, which has been extensively…
Magnetism, Charge Order and Giant Magnetoresistance in SrFeO Single Crystals
A. Lebon, P. Adler, C. Bernhard +6
The electronic and magnetic properties of SrFeO single crystals with controlled oxygen content () have been studied systematically by susceptibility, t…
Lattice dynamical signature of charge density wave formation in underdoped YBa2Cu3O6+x
M. Bakr, S. M. Souliou, S. Blanco-Canosa +10
We report a detailed Raman scattering study of the lattice dynamics in detwinned single crystals of the underdoped high temperature superconductor YBa2Cu3O6+x (x=0.75, 0.6, 0.55 an…
Electric-field-induced pyroelectric order and localization of the confined electrons in LaAlO3/SrTiO3 heterostructures
M. Rössle, K. W. Kim, A. Dubroka +13
With infrared ellipsometry, x-ray diffraction, and electric transport measurements we investigated the electric-field-effect on the confined electrons at the LaAlO3/SrTiO3 interfac…
Optical Characteristics of Charge Carrier Transfer across Interfaces between YBaCuO and LaCaMnO
A. Seo, A. V. Boris, G. Cristiani +2
We report a spectral ellipsometry study of multilayers composed of superconducting YBaCuO (YBCO) and ferromagnetic LaCaMnO in the spectral rang…
Mott versus Slater-type metal-insulator transition in Mn-substituted Sr3Ru2O7
M. A. Hossain, B. Bohnenbuck, Y. D. Chuang +15
We present a temperature-dependent x-ray absorption (XAS) and resonant elastic x-ray scattering (REXS) study of the metal-insulator transition (MIT) in Sr3(Ru1-xMnx)2O7. The XAS re…
Electronic superlattice revealed by resonant scattering from random impurities in Sr3Ru2O7
M. A. Hossain, I. Zegkinoglou, Y. -D. Chuang +16
Resonant elastic x-ray scattering (REXS) is an exquisite element-sensitive tool for the study of subtle charge, orbital, and spin superlattice orders driven by the valence electron…
Oxygen sublattice disorder and valence state modulation in infinite-layer nickelate superlattices
R. A. Ortiz, N. Enderlein, K. Fürsich +9
The family of infinite-layer nickelates promises important insights into the mechanism of unconventional superconductivity. Since superconductivity has so far only been observed in…
Doping Dependence of the Magnetic Resonance Peak in YBa_2 Cu_3 O_{6+x}
B. Keimer, H. F. Fong, S. H. Lee +2
We report inelastic neutron scattering experiments on the doping dependence of the energy and spectral weight of the sharp magnetic resonance peak in YBa_2 Cu_3 O_{6+x}. These meas…
High field charge order across the phase diagram of
F. Laliberté, M. Frachet, S. Benhabib +8
In hole-doped cuprates there is now compelling evidence that inside the pseudogap phase, charge order breaks translational symmetry leading to a reconstruction of the Fermi surface…
Chirality of Bloch domain walls in exchange biased CoO/Co bilayer seen by waveguide-enhanced neutron spin-flip scattering
Yu. Khaydukov, D. Lenk, V. Zdravkov +7
Magnetic state of exchanged biased CoO(20nm)/Co() bilayer (=5-20nm) was studied by means of polarized neutron reflectometry. By spacing of CoO/Co bilayer and AlO…
Magnetic phase diagram of
D. C. Peets, J. -H. Kim, P. Dosanjh +5
Magnetometry, electrical transport, and neutron scattering measurements were performed on single crystals of the Fe^{4+}-containing perovskite-related phase Sr_3Fe_2O_7-x as a func…
The resonant magnetic mode: a common feature of high- superconductors
Ph. Bourges, B. Keimer, S. Pailhès +3
Inelastic neutron scattering experiments in high- cuprates have evidenced a new magnetic excitation present in the superconducting state. In particular, recent experiments on…
Conformity of spin fluctuations in alkali-metal iron selenide superconductors inferred from the observation of a magnetic resonant mode in K(x)Fe(2-y)Se(2)
G. Friemel, W. P. Liu, E. A. Goremychkin +6
Spin excitations stemming from the metallic phase of the ferrochalcogenide superconductor K(0.77)Fe(1.85)Se(2) (T_c=32 K) were mapped out in the ab plane by means of the time-of-fl…
Evidence for spin-triplet superconducting correlations in metal-oxide heterostructures with non-collinear magnetization
Yu. N. Khaydukov, G. A. Ovsyannikov, A. E. Sheyerman +9
Heterostructures composed of ferromagnetic La0.7Sr0.3MnO3, ferromagnetic SrRuO3, and superconducting YBa2Cu3Ox were studied experimentally. Structures of composition Au/La0.7Sr0.3M…
Short-range cluster spin glass near optimal superconductivity in BaFeNiAs
Xingye Lu, David W. Tam, Chenglin Zhang +9
High-temperature superconductivity in iron pnictides occurs when electrons are doped into their antiferromagnetic (AF) parent compounds. In addition to inducing superconductivity,…
Low-energy Mott-Hubbard excitations in LaMnO_3 probed by optical ellipsometry
N. N. Kovaleva, Andrzej M. Oles, A. M. Balbashov +4
We present a comprehensive ellipsometric study of an untwinned, nearly stoichiometric LaMnO_3 crystal in the spectral range 1.2-6.0 eV at temperatures 20 K < T < 300 K. The complex…
Studying Critical Parameters of Superconductor via Diamond Quantum Sensors
Kin On Ho, Wai Kuen Leung, Yiu Yung Pang +11
Critical parameters are the key to superconductivity research, and reliable instrumentations can facilitate the study. Traditionally, one has to use several different measurement t…