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Publications (40)

cond-mat.supr-con2010

CeFePO: f-d hybridization and quenching of superconductivity

M. G. Holder, A. Jesche, P. Lombardo +11

Being homologue to the new, Fe-based type of high-temperature superconductors, CeFePO exhibits magnetism, Kondo and heavy-fermion phenomena. We experimentally studied the electroni…

cond-mat.supr-con2021

Charge and spin order dichotomy in NdNiO $_{2}$ driven by SrTiO $_{3}$ capping layer

G. Krieger, L. Martinelli, S. Zeng +10

Superconductivity in infinite-layer nickelates holds exciting analogies with that of cuprates, with similar structures and $3 d$ -electron count. Using resonant inelastic x-ray scatt…

physics.optics2024

Confocal Raman Microscopy with Adaptive Optics

J. D. Munoz-Bolanos, P. Rajaeipour, K. Kummer +4

Confocal Raman microscopy, a highly specific and label-free technique for the microscale study of thick samples, often presents difficulties due to weak Raman signals. Inhomogeneou…

cond-mat.supr-con2015

High-energy magnetic excitations in overdoped La $_{2 - x}$ Sr $_{x}$ CuO $_{4}$ studied by neutron and resonant inelastic X-ray scattering

S. Wakimoto, K. Ishii, H. Kimura +7

We have performed neutron inelastic scattering and resonant inelastic X-ray scattering (RIXS) at the Cu- $L_{3}$ edge to study high-energy magnetic excitations at energy transfers of…

cond-mat.str-el2026

Contrasting Spin Excitations in Octahedral and Square-Planar n=8 Ruddlesden-Popper Nickelates

K. Scott, H. LaBollita, G. A. Pan +15

The discovery of superconductivity in reduced square-planar nickelates marked a major advance in identifying structural and electronic analogs to the high- $T_{c}$ cuprates. The more…

cond-mat.supr-con2013

Persistence of magnetic excitations in La2-xSrxCuO4 from the undoped insulator to the heavily overdoped non-superconducting metal

M. P. M. Dean, G. Dellea, R. S. Springell +11

One of the most intensely studied scenarios of high-temperature superconductivity (HTS) postulates pairing by exchange of magnetic excitations [1]. Indeed, such excitations have be…

cond-mat.str-el2018

Similar temperature scale for valence changes in Kondo lattices with different Kondo temperatures

K. Kummer, C. Geibel, C. Krellner +4

The Kondo model predicts that both the valence at low temperatures and its temperature dependence scale with the characteristic energy T_K of the Kondo interaction. Here, we study…

cond-mat.mes-hall2020

Observation of a cubic Rashba effect in the surface spin structure of rare-earth ternary materials

D. Yu. Usachov, I. A. Nechaev, G. Poelchen +17

Spin-orbit interaction and structure inversion asymmetry in combination with magnetic ordering is a promising route to novel materials with highly mobile spin-polarized carriers at…

cond-mat.supr-con2016

Direct observation of charge order in underdoped and optimally doped Bi $_{2}$ (Sr,La) $_{2}$ CuO $_{6 + I^´}$ by resonant inelastic x-ray scattering

Y. Y. Peng, M. Salluzzo, X. Sun +10

Charge order in underdoped and optimally doped high- $T_{c}$ superconductors Bi $_{2}$ Sr $_{2 - x}$ La $_{x}$ CuO $_{6 + I^´}$ (Bi2201) is investigated by Cu $L_{3}$ edge resonant inelastic…

cond-mat.str-el2024

Strain-Tuned Magnetic Frustration in a Square Lattice $J_{1}$ - $J_{2}$ Material

I. BiaÅo, L. Martinelli, G. De Luca +16

Magnetic frustration is a route that can lead to the emergence of novel ground states, including spin liquids and spin ices. Such frustration can be introduced through either the g…

cond-mat.str-el2019

Metamagnetic texture in a polar antiferromagnet

D. A. Sokolov, N. Kikugawa, T. Helm +8

The notion of a simple ordered state implies homogeneity. If the order is established by a broken symmetry, elementary Landau theory of phase transitions shows that only one symmet…

cond-mat.str-el2017

GdRh $_{2}$ Si $_{2}$ : An exemplary tetragonal system for antiferromagnetic order with weak in-plane anisotropy

K. Kliemt, M. Hofmann-Kliemt, K. Kummer +3

The anisotropy of magnetic properties commonly is introduced in textbooks using the case of an antiferromagnetic system with Ising type anisotropy. This model presents huge anisotr…

cond-mat.supr-con2021

Novel magnetic stoichiometric superconductor EuRbFe4As4

T. K. Kim, K. S. Pervakov, V. A. Vlasenko +16

In the novel stoichiometric iron-based material RbEuFe4As4 superconductivity coexists with a peculiar long-range magnetic order of Eu 4f states; their coexistance is puzzling and r…

cond-mat.str-el2022

Kondo quasiparticle dynamics observed by resonant inelastic x-ray scattering

M. C. Rahn, K. Kummer, A. Hariki +18

Effective models focused on pertinent low-energy degrees of freedom have substantially contributed to our qualitative understanding of quantum materials. An iconic example, the Kon…

cond-mat.str-el2018

Ga $_{x}$ Cu $_{4 - x}$ (OD) $_{6}$ Cl $_{2}$ : Insulating ground state in an electron doped kagome system

P. Puphal, K. M. Ranjith, A. Pustogow +11

We present a successful synthesis method of the series Ga $_{x}$ Cu $_{4 - x}$ (OD) $_{6}$ Cl $_{2}$ with substitutions up to $x = 0.8$ . The compound remains a frustrated kagome system with a…

cond-mat.str-el2018

High-resolution resonant inelastic soft X-ray scattering as a probe of the crystal electrical field in lanthanides demonstrated for the case of CeRh2Si2

A. Amorese, N. Caroca-Canales, S. Seiro +6

The magnetic properties of rare earth compounds are usually well captured by assuming a fully localized f shell and only considering the Hund's rule ground state multiplet split by…

cond-mat.supr-con2014

Direct observation of bulk charge modulations in optimally-doped Bi $_{1.5}$ Pb $_{0.6}$ Sr $_{1.54}$ CaCu $_{2}$ O $_{8 + I^´}$

M. Hashimoto, G. Ghiringhelli, W. -S. Lee +12

Bulk charge density modulations, recently observed in high critical-temperature ( $T_{c}$ ) cuprate superconductors, coexist with the so-called pseudogap and compete with supe…

cond-mat.supr-con2012

How chemical pressure affects the fundamental properties of rare-earth pnictides: an ARPES view

M. G. Holder, A. Jesche, P. Lombardo +9

Angle-resolved photoelectron spectroscopy, supplemented by theoretical calculations has been applied to study the electronic structure of heavy-fermion material CeFePO, a homologue…

cond-mat.str-el2018

Evolution of ground state wave function in CeCoIn $_{5}$ upon Cd or Sn doping

K. Chen, F. Strigari, M. Sundermann +13

We present linear polarization-dependent soft x-ray absorption spectroscopy data at the Ce $M_{4, 5}$ edges of Cd and Sn doped CeCoIn $_{5}$ . The 4 $f$ ground state wave functions have…

cond-mat.supr-con2025

Coincident onset of charge order and pseudogap in a homogeneous high-temperature superconductor

D. Betto, S. Nakata, F. Pisani +10

Understanding high-temperature superconductivity in cuprates requires knowledge of the metallic phase it evolves from, particularly the pseudogap profoundly affecting the electroni…

cond-mat.supr-con2018

Coupling between dynamic magnetic and charge-order correlations in the cuprate superconductor Nd $_{2 - x}$ Ce $_{x}$ CuO $_{4}$

E. H. da Silva Neto, M. Minola, B. Yu +14

Charge order has now been observed in several cuprate high-temperature superconductors. We report a resonant inelastic x-ray scattering experiment on the electron-doped cuprate Nd$…

cond-mat.str-el2017

Insight into the temperature dependent properties of the ferromagnetic Kondo lattice YbNiSn

A. Generalov, D. A. Sokolov, A. Chikina +10

Analyzing temperature dependent photoemission (PE) data of the ferromagnetic Kondo-lattice (KL) system YbNiSn in the light of the Periodic Anderson model (PAM) we show that the KL…

cond-mat.supr-con2021

Charge density waves and Fermi-surface reconstruction in the clean overdoped cuprate superconductor Tl2Ba2CuO6+x

C. C. Tam, M. Zhu, J. Ayres +5

Hall effect and quantum oscillation measurements on high temperature cuprate superconductors show that underdoped compositions have a small Fermi surface pocket whereas when heavil…

cond-mat.supr-con2014

High-energy spin and charge excitations in electron-doped copper oxide superconductors

K. Ishii, M. Fujita, T. Sasaki +15

The evolution of electronic (spin and charge) excitations upon carrier doping is an extremely important issue in superconducting layered cuprates and the knowledge of its asymmetry…

cond-mat.supr-con2017

Re-entrant charge order in overdoped (Bi,Pb) $_{2.12}$ Sr $_{1.88}$ CuO $_{6 + I^´}$ outside the pseudogap regime

Y. Y. Peng, R. Fumagalli, Y. Ding +15

Charge modulations are considered as a leading competitor of high-temperature superconductivity in the underdoped cuprates, and their relationship to Fermi surface reconstructions…

cond-mat.supr-con2013

Magnetic excitations in stripe-ordered La $_{1.875}$ Ba $_{0.125}$ CuO $_{4}$ studied using resonant inelastic x-ray scattering

M. P. M. Dean, G. Dellea, M. Minola +10

The charge and spin correlations in La $_{1.875}$ Ba $_{0.125}$ CuO $_{4}$ (LBCO 1/8) are studied using Cu $L_{3}$ edge resonant inelastic x-ray scattering (RIXS). The static charge order (…

cond-mat.supr-con2020

Charge density waves in YBa $_{2}$ Cu $_{3}$ O $_{6.67}$ probed by resonant x-ray scattering under uniaxial compression

H. -H. Kim, E. LefranÃ§ois, K. Kummer +14

We report a comprehensive Cu L $_{3}$ -edge resonant x-ray scattering study of two- and three-dimensional (2D and 3D) incommensurate charge correlations in single crystals of the under…

cond-mat.supr-con2017

High-temperature charge density wave correlations in La $_{1.875}$ Ba $_{0.125}$ CuO $_{4}$ without spin-charge locking

H. Miao, J. Lorenzana, G. Seibold +11

Although all superconducting cuprates display charge-ordering tendencies, their low-temperature properties are distinct, impeding efforts to understand the phenomena within a singl…

cond-mat.supr-con2018

Three dimensional collective charge excitations in electron-doped cuprate superconductors

M. Hepting, L. Chaix, E. W. Huang +17

High temperature cuprate superconductors consist of stacked CuO2 planes, with primarily two dimensional electronic band structures and magnetic excitations, while superconducting c…

cond-mat.mtrl-sci2018

Microscopic effects of Dy-doping in the topological insulator Bi2Te3

L. B. Duffy, N. -J. Steinke, J. A. Krieger +13

Magnetic doping with transition metal ions is the most widely used approach to break timereversal symmetry in a topological insulator, a prerequisite for unlocking the TIs exotic p…

cond-mat.supr-con2016

Influence of apical oxygen on the extent of in-plane exchange interaction in cuprate superconductors

Y. Y. Peng, G. Dellea, M. Minola +14

In high Tc superconductors the magnetic and electronic properties are determined by the probability that valence electrons virtually jump from site to site in the CuO2 planes, a me…

cond-mat.supr-con2020

When superconductivity does not fear magnetism: Insight into electronic structure of RbEuFe $_{4}$ As $_{4}$

T. K. Kim, K. S. Pervakov, D. V. Evtushinsky +13

In the novel stoichiometric iron-based material RbEuFe $_{4}$ As $_{4}$ superconductivity coexists with a peculiar long-range magnetic order of Eu 4f states. Using angle-resolved phot…

cond-mat.supr-con2020

High-Temperature Charge-Stripe Correlations in La $_{1.675}$ Eu $_{0.2}$ Sr $_{0.125}$ CuO $_{4}$

Qisi Wang, M. Horio, K. von Arx +24

We use resonant inelastic x-ray scattering to investigate charge-stripe correlations in La $_{1.675}$ Eu $_{0.2}$ Sr $_{0.125}$ CuO $_{4}$ . By differentiating elastic from inelastic scatter…

cond-mat.supr-con2019

Polarization resolved Cu $L_{3}$ -edge resonant inelastic x-ray scattering of orbital and spin excitations in NdBa $_{2}$ Cu $_{3}$ O $_{7 - I^´}$

R. Fumagalli, L. Braicovich, M. Minola +14

High resolution resonant inelastic x-ray scattering (RIXS) has proven particularly effective in the determination of crystal field and spin excitations in cuprates. Its strength li…

cond-mat.str-el2013

Interplay of Dirac fermions and heavy quasiparticles in solids

M. HÃ¶ppner, S. Seiro, A. Chikina +14

Many-body interactions in crystalline solids can be conveniently described in terms of quasiparticles with strongly renormalized masses as compared to those of non-interacting part…

cond-mat.str-el2024

Evolution of the magnetic excitations in electron-doped $La_{2 - x} Ce_{x} CuO_{4}$

X. T. Li, S. J. Tu, L. Chaix +13

We investigated the high energy spin excitations in electron-doped $La_{2 - x} Ce_{x} CuO_{4}$ , a cuprate superconductor, by resonant inelastic x-ray scatter…

cond-mat.supr-con2018

Dispersion, damping, and intensity of spin excitations in the single-layer (Bi,Pb) $_{2}$ (Sr,La) $_{2}$ CuO $_{6 + I^´}$ cuprate superconductor family

Y. Y. Peng, E. W. Huang, R. Fumagalli +11

Using Cu- $L_{3}$ edge resonant inelastic x-ray scattering (RIXS) we measured the dispersion and damping of spin excitations (magnons and paramagnons) in the high- $T_{c}$ super…

cond-mat.str-el2011

Evolution of magnetism in Yb(Rh_(1-x)Co_x)2Si2

C. Klingner, C. Krellner, M. Brando +10

We present a study of the evolution of magnetism from the quantum critical system YbRh2Si2 to the stable trivalent Yb system YbCo2Si2. Single crystals of Yb(Rh_(1-x)Co_x)2Si2 were…

cond-mat.str-el2020

Deterministic control of an antiferromagnetic spin arrangement using ultrafast optical excitation

Y. W. Windsor, A. Ernst, K. Kummer +8

A central prospect of antiferromagnetic spintronics is to exploit magnetic properties that are unavailable with ferromagnets. However, this poses the challenge of accessing such pr…

cond-mat.supr-con2019

Paramagnon dispersion in $I^^{2}$ -FeSe observed by Fe $L$ -edge resonant inelastic x-ray scattering

M. C. Rahn, K. Kummer, N. B. Brookes +3

We report an Fe $L$ -edge resonant inelastic x-ray scattering (RIXS) study of the unusual superconductor $I^^{2}$ -FeSe. The high energy resolution of this RIXS experiment ( $\approx$ 55…

Publications (40)

CeFePO: f-d hybridization and quenching of superconductivity

Charge and spin order dichotomy in NdNiO2​ driven by SrTiO3​ capping layer

Confocal Raman Microscopy with Adaptive Optics

High-energy magnetic excitations in overdoped La2−x​Srx​CuO4​ studied by neutron and resonant inelastic X-ray scattering

Contrasting Spin Excitations in Octahedral and Square-Planar n=8 Ruddlesden-Popper Nickelates

Persistence of magnetic excitations in La2-xSrxCuO4 from the undoped insulator to the heavily overdoped non-superconducting metal

Similar temperature scale for valence changes in Kondo lattices with different Kondo temperatures

Observation of a cubic Rashba effect in the surface spin structure of rare-earth ternary materials

Direct observation of charge order in underdoped and optimally doped Bi2​(Sr,La)2​CuO6+I^´​ by resonant inelastic x-ray scattering

Strain-Tuned Magnetic Frustration in a Square Lattice J1​-J2​ Material

Metamagnetic texture in a polar antiferromagnet

GdRh2​Si2​: An exemplary tetragonal system for antiferromagnetic order with weak in-plane anisotropy

Novel magnetic stoichiometric superconductor EuRbFe4As4

Kondo quasiparticle dynamics observed by resonant inelastic x-ray scattering

Gax​Cu4−x​(OD)6​Cl2​: Insulating ground state in an electron doped kagome system

High-resolution resonant inelastic soft X-ray scattering as a probe of the crystal electrical field in lanthanides demonstrated for the case of CeRh2Si2

Direct observation of bulk charge modulations in optimally-doped Bi1.5​Pb0.6​Sr1.54​CaCu2​O8+I^´​

How chemical pressure affects the fundamental properties of rare-earth pnictides: an ARPES view

Evolution of ground state wave function in CeCoIn5​ upon Cd or Sn doping

Coincident onset of charge order and pseudogap in a homogeneous high-temperature superconductor

Coupling between dynamic magnetic and charge-order correlations in the cuprate superconductor Nd2−x​Cex​CuO4​

Insight into the temperature dependent properties of the ferromagnetic Kondo lattice YbNiSn

Charge density waves and Fermi-surface reconstruction in the clean overdoped cuprate superconductor Tl2Ba2CuO6+x

High-energy spin and charge excitations in electron-doped copper oxide superconductors

Re-entrant charge order in overdoped (Bi,Pb)2.12​Sr1.88​CuO6+I^´​ outside the pseudogap regime

Magnetic excitations in stripe-ordered La1.875​Ba0.125​CuO4​ studied using resonant inelastic x-ray scattering

Charge density waves in YBa2​Cu3​O6.67​ probed by resonant x-ray scattering under uniaxial compression

High-temperature charge density wave correlations in La1.875​Ba0.125​CuO4​ without spin-charge locking

Three dimensional collective charge excitations in electron-doped cuprate superconductors

Microscopic effects of Dy-doping in the topological insulator Bi2Te3

Influence of apical oxygen on the extent of in-plane exchange interaction in cuprate superconductors

When superconductivity does not fear magnetism: Insight into electronic structure of RbEuFe4​As4​

High-Temperature Charge-Stripe Correlations in La1.675​Eu0.2​Sr0.125​CuO4​

Polarization resolved Cu L3​-edge resonant inelastic x-ray scattering of orbital and spin excitations in NdBa2​Cu3​O7−I^´​

Interplay of Dirac fermions and heavy quasiparticles in solids

Evolution of the magnetic excitations in electron-doped La2−x​Cex​CuO4​

Dispersion, damping, and intensity of spin excitations in the single-layer (Bi,Pb)2​(Sr,La)2​CuO6+I^´​ cuprate superconductor family

Evolution of magnetism in Yb(Rh_(1-x)Co_x)2Si2

Deterministic control of an antiferromagnetic spin arrangement using ultrafast optical excitation

Paramagnon dispersion in I^2-FeSe observed by Fe L-edge resonant inelastic x-ray scattering

Charge and spin order dichotomy in NdNiO $_{2}$ driven by SrTiO $_{3}$ capping layer

High-energy magnetic excitations in overdoped La $_{2 - x}$ Sr $_{x}$ CuO $_{4}$ studied by neutron and resonant inelastic X-ray scattering

Direct observation of charge order in underdoped and optimally doped Bi $_{2}$ (Sr,La) $_{2}$ CuO $_{6 + I^´}$ by resonant inelastic x-ray scattering

Strain-Tuned Magnetic Frustration in a Square Lattice $J_{1}$ - $J_{2}$ Material

GdRh $_{2}$ Si $_{2}$ : An exemplary tetragonal system for antiferromagnetic order with weak in-plane anisotropy

Ga $_{x}$ Cu $_{4 - x}$ (OD) $_{6}$ Cl $_{2}$ : Insulating ground state in an electron doped kagome system

Direct observation of bulk charge modulations in optimally-doped Bi $_{1.5}$ Pb $_{0.6}$ Sr $_{1.54}$ CaCu $_{2}$ O $_{8 + I^´}$

Evolution of ground state wave function in CeCoIn $_{5}$ upon Cd or Sn doping

Coupling between dynamic magnetic and charge-order correlations in the cuprate superconductor Nd $_{2 - x}$ Ce $_{x}$ CuO $_{4}$

Re-entrant charge order in overdoped (Bi,Pb) $_{2.12}$ Sr $_{1.88}$ CuO $_{6 + I^´}$ outside the pseudogap regime

Magnetic excitations in stripe-ordered La $_{1.875}$ Ba $_{0.125}$ CuO $_{4}$ studied using resonant inelastic x-ray scattering

Charge density waves in YBa $_{2}$ Cu $_{3}$ O $_{6.67}$ probed by resonant x-ray scattering under uniaxial compression

High-temperature charge density wave correlations in La $_{1.875}$ Ba $_{0.125}$ CuO $_{4}$ without spin-charge locking

When superconductivity does not fear magnetism: Insight into electronic structure of RbEuFe $_{4}$ As $_{4}$

High-Temperature Charge-Stripe Correlations in La $_{1.675}$ Eu $_{0.2}$ Sr $_{0.125}$ CuO $_{4}$

Polarization resolved Cu $L_{3}$ -edge resonant inelastic x-ray scattering of orbital and spin excitations in NdBa $_{2}$ Cu $_{3}$ O $_{7 - I^´}$

Evolution of the magnetic excitations in electron-doped $La_{2 - x} Ce_{x} CuO_{4}$

Dispersion, damping, and intensity of spin excitations in the single-layer (Bi,Pb) $_{2}$ (Sr,La) $_{2}$ CuO $_{6 + I^´}$ cuprate superconductor family

Paramagnon dispersion in $I^^{2}$ -FeSe observed by Fe $L$ -edge resonant inelastic x-ray scattering