Publications (64)
Electronic structure of the SrTiO/LaAlO interface revealed by resonant soft x-ray scattering
H. Wadati, D. G. Hawthorn, J. Geck +11
We investigated the electronic structure of the SrTiO/LaAlO superlattice (SL) by resonant soft x-ray scattering. The (003) peak, which is forbidden for our "ideal" SL struc…
An in-vacuum diffractometer for resonant elastic soft x-ray scattering
D. G. Hawthorn, F. He, L. Venema +13
We describe the design, construction and performance of a 4-circle in-vacuum diffractometer for resonant elastic soft x-ray scattering and reflectivity. The diffractometer, install…
Relation between the one-particle spectral function and dynamic spin susceptibility in superconducting BiSrCaCuO
D. Inosov, S. Borisenko, I. Eremin +9
Angle resolved photoemission spectroscopy (ARPES) provides a detailed view of the renormalized band structure and, consequently, is a key to the self-energy and the single-particle…
Orbital textures and charge density waves in transition metal dichalcogenides
T. Ritschel, J. Trinckauf, K. Koepernik +6
Low-dimensional electron systems, as realized naturally in graphene or created artificially at the interfaces of heterostructures, exhibit a variety of fascinating quantum phenomen…
Ba2YIrO6: A cubic double perovskite material with Ir5+ ions
T. Dey, A. Maljuk, D. V. Efremov +13
Materials with a 5d4 electronic configuration are generally considered to have a nonmagnetic ground state (J=0). Interestingly, Sr2YIrO6 (Ir5+ having 5d4 electronic configuration)…
Electronic structure of Pr_{2-x}Ce_xCuO_4 studied via ARPES and LDA+DMFT+Σ_k
I. A. Nekrasov, N. S. Pavlov, E. Z. Kuchinskii +10
The electron-doped Pr(2-x)Ce(x)CuO(4) (PCCO) compound in the pseudogap regime (x~0.15) was investigated using angle-resolved photoemission spectroscopy (ARPES) and the generalized…
Resonant elastic soft x-ray scattering in oxygen-ordered YBa_2Cu_3O_{6+delta}
D. G. Hawthorn, K. M. Shen, J. Geck +11
Static charge-density wave (CDW) and spin-density wave (SDW) order has been convincingly observed in La-based cuprates for some time. However, more recently it has been suggested b…
The incommensurate magnet iron monophosphide FeP: Crystal growth and characterization
I. O. Chernyavskii, S. E. Nikitin, Y. A. Onykiienko +14
We report an optimized chemical vapor transport method, which allows growing FeP single crystals up to 500 mg in mass and 80 in volume. The high quality of the crystals ob…
Pressure-dependent Electronic Superlattice in the Kagome-Superconductor CsVSb
F. Stier, A. -A. Haghighirad, G. Garbarino +9
We present a high-resolution single crystal x-ray diffraction study of kagome-superconductor \cvs, exploring its response to variations in pressure and temperature. We discover tha…
Intrinsic versus extrinsic orbital and electronic reconstructions at complex oxide interfaces
R. J. Green, V. Zabolotnyy, M. Zwiebler +10
The interface between the insulators LaAlO and SrTiO accommodates a two-dimensional electron liquid (2DEL) -- a high mobility electron system exhibiting superconductivity a…
Structural modulations in and their relation to charge ordering
M. v. Zimmermann, J. Geck, S. Kiele +2
Structural properties of the spin chain and ladder compound SrCuO have been studied using diffraction with hard x-rays. Strong incommensurate modulation reflec…
Stripe correlations in NaCoO
J. Geck, M. v. Zimmermann, H. Berger +5
We unambiguously demonstrate, based on high-energy x-ray diffraction data and LDA calculations, that sodium-density stripes are formed in Na0.75CoO2 at low temperatures and rule ou…
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…
The electronic structure of CeCoIn5 from angle-resolved photoemission spectroscopy I: Comparison to LDA
A. Koitzsch, I. Opahle, S. Elgazzar +12
We have investigated the low-energy electronic structure of the heavy fermion superconductor CeCoIn5 by angle-resolved photoemission and band structure calculations. We measured th…
Observation of Devil's Staircase in the Novel Spin Valve System SrCoO
T. Matsuda, S. Partzsch, T. Tsuyama +7
Using resonant soft x-ray scattering as a function of both temperature and magnetic field, we reveal a large number of almost degenerate magnetic orders in SrCo6O11. The Ising-like…
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…
Anisotropic quasiparticle renormalization in Na0.73CoO2: role of inter-orbital interactions and magnetic correlations
J. Geck, S. V. Borisenko, H. Berger +8
We report an angular resolved photoemission study of Na0.73CoO2 where it is found that the renormalization of the quasiparticle (QP) dispersion changes dramatically upon a rotation…
The role of the nominal iron content in the structural, compositional and physical properties of BaFeS
M. L. Amigó, Q. Stahl, A. Maljuk +6
BaFeS is a quasi-one-dimensional antiferromagnetic insulator that becomes superconducting under hydrostatic pressure. The magnetic ordering temperature, , as well as t…
Pressure-induced melting of the orbital polaron lattice in La1-xSrxMnO3
R. Klingeler, J. Geck, S. Arumugam +5
We report on the pressure effects on the orbital polaron lattice in the lightly doped manganites , with . The dependence of the orbital pol…
Interface reconstruction in V-oxide heterostructures determined by x-ray absorption spectroscopy
H. Wadati, D. G. Hawthorn, J. Geck +7
We present an x-ray absorption study of the dependence of the V oxidation state on the thickness of LaVO (LVO) and capping LaAlO (LAO) layers in the multilayer structure of…
Magnetic frustration, phase competition and the magneto-electric effect in NdFe3(BO3)4
J. E. Hamann-Borrero, S. Partzsch, S. Valencia +9
We present an element selective resonant magnetic x-ray scattering study of NdFe3(BO3)4 as a function of temperature and applied magnetic field. Our measurements show that the magn…
Probing the role of Co substitution in the electronic structure of iron-pnictides
G. Levy, R. Sutarto, D. Chevrier +10
The role of Co substitution in the low-energy electronic structure of Ca(FeCo)As is investigated by resonant photoemission spectroscopy and density func…
The electronic structure of CeCoIn5 from angle-resolved photoemission spectroscopy II: Hybridization effects
A. Koitzsch, S. V. Borisenko, D. Inosov +9
We have investigated the low-energy electronic structure of the heavy fermion superconductor CeCoIn5 by angle-resolved photoemission. We focus on the dispersion and the peak width…
A Comparison of Stripe Modulations in LaBaCuO and LaNdSrCuO
S. B. Wilkins, M. P. M. Dean, Jörg Fink +10
We report combined soft and hard x-ray scattering studies of the electronic and lattice modulations associated with stripe order in LaBaCuO and LaN…
Parity of the Pairing Bosons in a High-Temperature Superconductor
S. V. Borisenko, A. A. Kordyuk, A. Koitzsch +10
We report the observation of a novel effect in the bilayer Pb-Bi2212 high-TC superconductor by means of angle-resolved photoemission with circularly polarized excitation. Different…
A hard X- ray probe to study doping-dependent electron redistribution and strong covalency in La_{1-x}Sr_{1+x}MnO_4
Javier Herrero-Martin, A. Mirone, Javier Fernández-RodrÃguez +4
The effect of doping on the electronic structure at the Mn sites in the La_{1-x}Sr_{1+x}MnO_4 series (x=0, 0.3 and 0.5) was studied by means of non-resonant hard X- ray emission sp…
Resonant X-Ray Scattering Measurements of a Spatial Modulation of the Cu 3d and O 2p Energies in Stripe-Ordered Cuprate Superconductors
A. J. Achkar, F. He, R. Sutarto +4
A prevailing description of the stripe phase in underdoped cuprate superconductors is that the charge carriers (holes) phase segregate on a microscopic scale into hole rich and hol…
Comment on `Oxygen vacancy-induced magnetic moment in edge-sharing CuO chains of LiCuO'
R. O. Kuzian, R. Klingeler, W. E. A. Lorenz +23
In a recent work devoted to the magnetism of LiCuO, Shu et al. [New J. Phys. 19 (2017) 023026] have proposed a "simplified" unfrustrated microscopic model that differs…
Local mechanism of valence bond formation in IrTe
T. Ritschel, Q. Stahl, M. Kusch +7
Doped IrTe is considered a platform for topological superconductivity and therefore receives currently a lot of interest. In addition, the superconductivity in these materials…
Femtosecond Time-resolved MeV Electron Diffraction
Pengfei Zhu, H. Berger, J. Cao +9
We report the experimental demonstration of femtosecond electron diffraction using high-brightness MeV electron beams. High-quality, single-shot electron diffraction patterns for b…
Electronic phase transitions in PrCaMnO epitaxial thin films revealed by resonant soft x-ray scattering
H. Wadati, J. Geck, E. Schierle +7
We report the study of magnetic and orbital order in PrCaMnO epitaxial thin films grown on (LaAlO)-(SrAlTaO) (LSAT) (011…
Unidirectional Diagonal Order and 3D Stacking of Charge Stripes in Orthorhombic Pr1.67Sr0.33NiO4 and Nd1.67Sr0.33NiO4
M. Huecker, M. v. Zimmermann, R. Klingeler +9
The interplay between crystal symmetry and charge stripe order in Pr1.67Sr0.33NiO4 and Nd1.67Sr0.33NiO4 has been studied by means of single crystal x-ray diffraction. In contrast t…
Magnetic Superstructure and Metal-Insulator Transition in Mn-Substituted Sr3Ru2O7
M. A. Hossain, B. Bohnenbuck, Y. -D. Chuang +18
We present a temperature-dependent resonant elastic soft x-ray scattering (REXS) study of the metal-insulator transition in Sr3(Ru1-xMnx)2O7, performed at both Ru and Mn L-edges. R…
"Kinks", Nodal Bilayer Splitting and Interband Scattering in YBCO
S. V. Borisenko, A. A. Kordyuk, V. Zabolotnyy +13
We apply the new-generation ARPES methodology to the most widely studied cuprate superconductor YBCO. Considering the nodal direction, we found noticeable renormalization effects k…
Electronic depth profiles with atomic layer resolution from resonant soft x-ray reflectivity
M. Zwiebler, J. E. Hamann-Borrero, M. Vafaee +8
The analysis of x-ray reflectivity data from artificial heterostructures usually relies on the homogeneity of optical properties of the constituent materials. However, when the x-r…
Non-Resonant X-ray Magnetic Scattering on Rare-Earth Iron Borates RFe(BO)
J. E. Hamann-Borrero, M. Philipp, O. Kataeva +7
Hard x-ray scattering (HXS) experiments with a photon energy of 100keV were performed as a function of temperature and applied magnetic field on selected compounds of the RFe(B…
Emergence of charge density wave domain walls above the superconducting dome in TiSe2
Y. I. Joe, X. M. Chen, P. Ghaemi +11
Superconductivity (SC) in so-called "unconventional superconductors" is nearly always found in the vicinity of another ordered state, such as antiferromagnetism, charge density wav…
Charge order in La_{1.8-x}Eu_{0.2}Sr_xCuO_4 studied by resonant soft X-ray diffraction
J. Fink, E. Schierle, E. Weschke +8
Resonant soft X-ray scattering with photon energies near the O K and the Cu L3 edges was used to study charge ordering in the system La_{1.8-x}Eu_{0.2}Sr_xCuO_4 as a function of te…
Signatures of electronic polarons in LaSrMnO observed by electron energy-loss spectroscopy
R. Kraus, M. Schrade, R. Schuster +4
The dielectric properties of LaSrMnO single crystals with x = 0, 0.125, 0.25, and 0.5 were studied by means of electron energy-loss spectroscopy as a function o…
Electronic confinement and ordering instabilities in colossal magnetoresistive bilayer manganites
J. Trinckauf, T. Hänke, V. Zabolotnyy +11
We present angle-resolved photoemission studies of (La1-zPrz)2-2xSr1+2xMn2O7 with x=0.4 and z=0.1,0.2 and 0.4 along with density functional theory calculations and x-ray scattering…
Orbital symmetry of charge density wave order in La1.875Ba0.125CuO4 and YBa2Cu3O6.67
A. J. Achkar, F. He, R. Sutarto +9
Recent theories of charge density wave (CDW) order in high temperature superconductors have predicted a primarily d CDW orbital symmetry. Here, we report on the orbital symmetry of…
Pressure-induced dimerization and valence bond crystal formation in the Kitaev-Heisenberg magnet alpha-RuCl3
G. Bastien, G. Garbarino, R. Yadav +17
Magnetization and high-resolution x-ray diffraction measurements of the Kitaev-Heisenberg material alpha-RuCl3 reveal a pressure-induced crystallographic and magnetic phase transit…
Bond disorder and breakdown of ballistic heat transport in the spin-1/2 antiferromagnetic Heisenberg chain as seen in Ca-doped SrCuO2
N. Hlubek, P. Ribeiro, R. Saint-Martin +9
We study the impact of a weak bond disorder on the spinon heat transport in the S=1/2 antiferromagnetic (AFM) Heisenberg chain material Sr_{1-x}Ca_xCuO_2. We observe a drastic supp…
About the relation between the quasiparticle Green's function in cuprates obtained from ARPES data and the magnetic susceptibility
D. S. Inosov, S. V. Borisenko, I. Eremin +7
Angle resolved photoemission spectroscopy (ARPES) provides a detailed view of the renormalized band structure in cuprates and, consequently, is a key to the self-energy and the qua…
Quasi-1D Spin Textures: From Chiral Soliton Lattice to Fan State
M. Winter, A. Pignedoli, A. S. Sukhanov +18
In most helimagnets, an applied magnetic field aligns the propagation direction of a helical spin texture with the field, resulting in a conical state and obscuring the unwinding p…
Coexistence of metallicity and superconductivity in adjacent bilayers of a high-Tc superconductor
V. B. Zabolotnyy, S. V. Borisenko, A. A. Kordyuk +10
Experimental studies of the electronic structure remain the basic means for understanding the nature of high-temperature superconductivity (HTSC) and testing relevant theoretical m…
Observation of charge accumulation and onsite Coulomb repulsion at transition metal impurities in the iron pnictides
R. Kraus, V. Bisogni, L. Harnagea +7
We report a combined valence band photoemission and Auger spectroscopy study of single crystalline Ca(Fe,Co)2As2 and Ba(Fe,TM)2As2 with TM=Ni or Cu. The valence band photoemission…
A reevaluation of the coupling to a bosonic mode of the charge carriers in (Bi,Pb)SrCaCuO at the antinodal point
J. Fink, A. Koitzsch, J. Geck +5
Angle-resolved photoemission spectroscopy (ARPES) is used to study the spectral function of the optimally doped high-T superconductor (Bi,Pb)SrCaCuO in the…
Nematicity in stripe ordered cuprates probed via resonant x-ray scattering
A. J. Achkar, M. Zwiebler, Christopher McMahon +12
In underdoped cuprate superconductors, a rich competition occurs between superconductivity and charge density wave (CDW) order. Whether rotational symmetry breaking (nematicity) oc…
Effect of Zn and Ni impurities on the quasiparticle renormalization in Bi-2212
V. B. Zabolotnyy, S. V. Borisenko, A. A. Kordyuk +10
The Cu substitution by Zn and Ni impurities and its influence on the mass renormalization effects in angle resolved photoelectron spectra (ARPES) of Bi-2212 is addressed. We show t…
Observation of Electronic Ferroelectric Polarization in Multiferroic YMnO
S. Partzsch, S. B. Wilkins, J. P. Hill +5
We report the observation of a magnetic polarization of the O\,-states in YMnO through the use of soft X-ray resonant scattering at the oxygen -edge. Remarkably, we…
Pressure dependence of the charge density wave in 1T-TaS2 and its relation to superconductivity
T. Ritschel, J. Trinckauf, G. Garbarino +5
We present a state-of-the-art x-ray diffraction study of the charge density wave order in 1T-TaS2 as a function of temperature and pressure. Our results prove that the charge densi…
Disentangling surface and bulk photoemission using circularly polarized light
V. B. Zabolotnyy, S. V. Borisenko, A. A. Kordyuk +10
We show that in the angle resolved photoemission spectroscopy (ARPES) near-surface induced fields can be useful for disentangling the surface and bulk related emission. The jump of…
Temperature-driven reorganization of electronic order in CsVSb
Q. Stahl, D. Chen, T. Ritschel +3
We report a temperature dependent x-ray diffraction study of the electronic ordering instabilities in the kagome material CsVSb. Our measurements between 10 K and 120 K rev…
Surface and bulk electronic structure of unconventional superconductor Sr_2RuO_4: unusual splitting of the beta-band
V. B. Zabolotnyy, E. Carleschi, T. K. Kim +10
We present an angle resolved photoemission study of the surface and bulk electronic structure of the single layer ruthenate SrRuO. As the early studies of its electronic st…
Current spinon-holon description of the one-dimensional charge-transfer insulator SrCuO2: Angle-resolved photoemission measurements
A. Koitzsch, S. V. Borisenko, J. Geck +6
We have investigated the low-energy electronic structure of the strongly correlated one-dimensional copper oxide chain compound SrCuO2 by angle resolved photoemission as a function…
Octahedral tilts and electronic correlations in La_7/8Sr_1/8MnO_3
J. Geck, P. Wochner, S. Kiele +3
We present a resonant x-ray scattering study of the octahedral tilt order between 50K and 310K in La_7/8Sr_1/8MnO_3. At the La L_II-edge the resonant (300) reflection probes cooper…
Influence of Ti doping on the incommensurate charge density wave in 1T-TaS2
X. M. Chen, A. J. Miller, C. Nugroho +10
We report temperature-dependent transport and x-ray diffraction measurements of the influence of Ti hole doping on the charge density wave (CDW) in 1T-Ta(1-x)Ti(x)S(2). Confirming…
Resonant Elastic Soft X-Ray Scattering
J. Fink, E. Schierle, E. Weschke +1
Resonant (elastic) soft x-ray scattering (RSXS) offers a unique element, site, and valence specific probe to study spatial modulations of charge, spin, and orbital degrees of freed…
Cu -edge Resonant Inelastic X-Ray Scattering in Edge-Sharing Cuprates
F. Vernay, B. Moritz, I. Elfimov +4
We present calculations for resonant inelastic x-ray scattering (RIXS) in edge-shared copper oxide systems, such as CuGeO and LiCuO, appropriate for hard x-ray sc…
Field-induced condensation of to 2 soliton lattices in chiral magnets
M. Winter, A. Pignedoli, M. C. Rahn +19
Chiral soliton lattices (CSLs) are nontrivial spin textures that emerge from the competition between Dzyaloshinskii-Moriya interaction, anisotropy, and magnetic fields. While well…
Control of the magnetic phase coexistence in NdFe(BO) by electric fields
S. Partzsch, J. E. Hamann-Borrero, C. Mazzoli +5
We present a resonant x-ray diffraction study of the magnetic order in NdFe(BO) and its coupling to applied electric fields. Our high-resolution measurements reveal A c…
X-ray absorption spectroscopy on layered cobaltates Na_xCoO_2
T. Kroll, M. Knupfer, J. Geck +7
Measurements of polarization and temperature dependent soft x-ray absorption have been performed on Na_xCoO_2 single crystals with x=0.4 and x=0.6. They show a deviation of the loc…
Orbital polaron lattice formation in lightly doped La1-xSrxMnO3
J. Geck, P. Wochner, S. Kiele +4
By resonant x-ray scattering at the Mn K-edge on La7/8Sr1/8MnO3, we show that an orbital polaron lattice (OPL) develops at the metal-insulator transition of this compound. This orb…