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Publications (30)

cond-mat.supr-con2010

YBa $_{2}$ Cu $_{3}$ O $_{7}$ /La $_{0.7}$ Ca $_{0.3}$ MnO $_{3}$ bilayers: Interface coupling and electric transport properties

R. Werner, C. Raisch, A. Ruosi +9

Heteroepitaxially grown bilayers of ferromagnetic La $_{0.7}$ Ca $_{0.3}$ MnO $_{3}$ (LCMO) on top of superconducting YBa $_{2}$ Cu $_{3}$ O $_{7}$ (YBCO) thin films were investigated by focusing on…

cond-mat.str-el2014

X-ray absorption spectroscopy study of the electronic and magnetic proximity effects in YBa $_{2}$ Cu $_{3}$ O $_{7}$ /La $_{2/3}$ Ca $_{1/3}$ MnO $_{3}$ and La $_{2 - x}$ Sr $_{x}$ CuO $_{4}$ /La $_{2/3}$ Ca $_{1/3}$ MnO $_{3}$ multilayers

M. A. Uribe-Laverde, S. Das, K. Sen +10

With x-ray absorption spectroscopy we investigated the orbital reconstruction and the induced ferromagnetic moment of the interfacial Cu atoms in YBa $_{2}$ Cu $_{3}$ O $_{7}$ /La $_{2/3}$ Ca$…

cond-mat.mtrl-sci2010

Orbital-Resolved Partial Charge Transfer from the Methoxy Groups of Substituted Pyrenes in Complexes with Tetracyanoquinodimethane - a NEXAFS Study

K. Medjanik, S. A. Nepijko, H. J. Elmers +7

It is demonstrated that the near-edge X-ray absorption fine structure (NEXAFS) provides a powerful local probe of functional groups in novel charge transfer (CT) compounds. Microcr…

cond-mat.supr-con2025

Hybridization of lattice and charge order excitations in a superconducting cuprate

S. M. Souliou, D. Ishikawa, R. Heid +9

The ubiquitous tendency of superconducting cuprates to form charge density waves (CDWs) has reignited interest in the nature of their electron-phonon interaction and its role in sh…

cond-mat.str-el2022

Elastoresistivity in the incommensurate charge density wave phase of BaNi $_{2}$ (As $_{1-x}$ P $_{x}$ ) $_{2}$

M. Frachet, P. W. Wiecki, T. Lacmann +7

Electronic nematicity, the breaking of the crystal lattice rotational symmetry by the electronic fluid, is a fascinating quantum state of matter. Recently, BaNi $_{2}$ As $_{2}$ has emerg…

cond-mat.supr-con2024

Chemical pressure tuning of competing orders in $Ba_{1 - x} Ca_{x} Ni_{2} As_{2}$

F. Henssler, K. Willa, M. Frachet +5

$Ba Ni_{2} As_{2}$ , a structural-analogue to the iron-based parent compound $Ba Fe_{2} As_{2}$ , offers a unique platform to study…

cond-mat.mtrl-sci2023

Doping-Induced Electronic and Structural Phase Transition in the Bulk Weyl Semimetal Mo1-xWxTe2

O. Fedchenko, F. K. Diekmann, P. Russmann +21

A comprehensive study of the electronic and structural phase transition from 1T` to Td in the bulk Weyl semimetal Mo1-xWxTe2 at different doping concentrations has been carried out…

cond-mat.str-el2022

Soft-phonon and charge-density-wave formation in nematic BaNi $_{2}$ As $_{2}$

S. M. Souliou, T. Lacmann, R. Heid +7

We use diffuse and inelastic x-ray scattering to study the formation of an incommensurate charge-density-wave (I-CDW) in BaNi $_{2}$ As $_{2}$ , a candidate system for charge-driven electr…

cond-mat.str-el2020

Electronic correlations in the van der Waals ferromagnet Fe $_{3}$ GeTe $_{2}$ revealed by its charge dynamics

M. Corasaniti, R. Yang, K. Sen +5

The layered van der Waals ferromagnetic Fe $_{3}$ GeTe $_{2}$ harbours an unconventional interplay between topology and magnetism, leading to a large anomalous Hall conductivity at low te…

cond-mat.supr-con2020

Vortex-lattice melting and paramagnetic depairing in the nematic superconductor FeSe

F. Hardy, L. Doussoulin, T. Klein +9

The full H-T phase diagram in the nematic superconductor FeSe is mapped out using specific-heat and thermal-expansion measurements down to 0.7 K and up to 30 T for both field direc…

cond-mat.supr-con2002

Electronic structure of single-crystalline Mg(x)Al(1-x)B(2)

S. Schuppler, E. Pellegrin, N. Nuecker +11

Polarization-dependent x-ray absorption spectroscopy at the B 1s edge of single-crystalline Mg(x)Al(1-x)B(2) reveals a strongly anisotropic electronic structure near the Fermi ener…

cond-mat.supr-con2019

Competing Electronic Phases near the Onset of Superconductivity in Hole-doped SrFe2As2

L. Wang, M. He, D. D. Scherer +6

An intriguingly complex phase diagram of Na-doped SrFe2As2 is uncovered using high-resolution thermal-expansion, magnetization and heat-capacity measurements. The detailed temperat…

cond-mat.supr-con2018

Soft phonons reveal the nematic correlation length in Ba(Fe $_{0.94}$ Co $_{0.06}$ ) $_{2}$ As $_{2}$

F. Weber, D. Parshall, L. Pintschovius +8

Nematicity is ubiquitous in electronic phases of high- $T_{c}$ superconductors, particularly in the Fe-based systems. While several experiments have probed nematic fluctuations, they…

cond-mat.str-el2008

Suppression of spin-state transition in epitaxially strained LaCoO_{3}

C. Pinta, D. Fuchs, M. Merz +5

Epitaxial thin films of LaCoO_{3} (E-LCO) exhibit ferromagnetic order with a transition temperature T_c = 85 K, while polycrystalline thin LaCoO_{3} films (P-LCO) remain paramagnet…

cond-mat.str-el2020

Dominant in-plane symmetric elastoresistance in CsFe2As2

P. Wiecki, A. -A. Haghighirad, F. Weber +3

We study the elastoresistance of the highly correlated material CsFe2As2 in all symmetry channels. Neutralizing its thermal expansion by means of a piezoelectric-based strain cell…

cond-mat.str-el2012

Magnetic proximity effect in $YB a_{2} C u_{3} O_{7} /L a_{2/3} C a_{1/3} Mn O_{3}$ and $YB a_{2} C u_{3} O_{7} /LaMn O_{3 + I^´}$ superlattices

D. K. Satapathy, M. A. Uribe-Laverde, I. Marozau +21

Using neutron reflectometry and resonant x-ray techniques we studied the magnetic proximity effect (MPE) in superlattices composed of superconducting YBa $_{2}$ Cu $_{3}$ O $_{7}$ (YBCO) and…

cond-mat.supr-con2020

Lattice-Shifted Nematic Quantum Critical Point in FeSe $_{1 - x}$ S $_{x}$

S. Chibani, D. Farina, P. Massat +13

We report the evolution of nematic fluctuations in FeSe $_{1 - x}$ S $_{x}$ single crystals as a function of Sulfur content $x$ across the nematic quantum critical point (QCP) $x_{c} \sim$ 0…

cond-mat.str-el2000

Hole distribution for (Sr,Ca,Y,La)_14 Cu_24 O_41 ladder compounds studied by x-ray absorption spectroscopy

N. NÃ¼cker, M. Merz, C. A. Kuntscher +20

The unoccupied electronic structure for the Sr_14Cu_24O_41 family of two-leg ladder compounds was investigated for different partial substitutions of Sr^2+ by Ca^2+, leaving the no…

stat.ML2021

Interpreting Deep Learning Models with Marginal Attribution by Conditioning on Quantiles

M. Merz, R. Richman, T. Tsanakas +1

A vastly growing literature on explaining deep learning models has emerged. This paper contributes to that literature by introducing a global gradient-based model-agnostic method,…

cond-mat.str-el2026

Interplay of Charge and Magnetic Orders in SmNiC $_{2}$ Mediated by Electron-Phonon Interaction

A. von Ungern-Sternberg Schwark, A. -A. Haghighirad, R. Heid +11

We investigate the interplay between charge density wave (CDW) instabilities and ferromagnetism in SmNiC $_{2}$ using diffuse and inelastic x-ray scattering together with Raman spectr…

cond-mat.mtrl-sci2019

Raman scattering study of lattice and magnetic excitations in CrAs

K. Sen, Y. Yao, R. Heid +6

We report on the lattice and spin dynamics in the monopnictide CrAs using polarized Raman scattering. This system exhibits a first-order magneto-structural phase transition at T_N~…

cond-mat.mtrl-sci2025

Orbital magnetization in the Nb-substituted Kagome metal CsV $_{3}$ Sb $_{5}$

H. J. Elmers, O. Tkach, Y. Lytvynenko +12

This study uses angle-resolved photoemission spectroscopy to examine the low-temperature electronic structure of Cs(V $_{0.95}$ Nb $_{0.05}$ ) $_{3}$ Sb $_{5}$ , demonstrating that partially s…

cond-mat.supr-con2016

Of Substitution and Doping: Spatial and Electronic Structure in Fe Pnictides

M. Merz, P. Schweiss, P. Nagel +5

A highly intriguing aspect in iron-pnictide superconductors is the composition-dependent electronic structure, in particular the question if and how charge carriers are introduced…

cond-mat.str-el2009

Soft x-ray magnetic circular dichroism of LaCoO $_{3}$ , La $_{0.7}$ Ce $_{0.3}$ CoO $_{3}$ , and La $_{0.7}$ Sr $_{0.3}$ CoO $_{3}$ films: Evidence for Co valency-dependent magnetism and magnetic anisotropy

M. Merz, P. Nagel, C. Pinta +7

Epitaxial thin films of undoped LaCoO $_{3}$ \@, of electron-doped La $_{0.7}$ Ce $_{0.3}$ CoO $_{3}$ \@, and of hole-doped La $_{0.7}$ Sr $_{0.3}$ CoO $_{3}$ \@ exhibit ferromagnetic order with…

cond-mat.supr-con2012

Electronic structure of single-crystalline Sr(Fe $_{1 - x}$ Co $_{x}$ ) $_{2}$ As $_{2}$ probed by x-ray absorption spectroscopy: Evidence for isovalent substitution of Fe $^{2 +}$ by Co $^{2 +}$

M. Merz, F. Eilers, Th. Wolf +3

The substitutional dependence of valence and spin-state configurations of Sr(Fe $_{1 - x}$ Co $_{x}$ ) $_{2}$ As $_{2}$ ( $x =$ 0, 0.05, 0.11, 0.17, and 0.38) is investigated with near-edge x-ray…

cond-mat.supr-con2012

Electronic structure of single-crystalline Mg $_{x}$ Al $_{1 - x}$ B $_{2}$ probed by x-ray diffraction multipole refinements and polarization-dependent x-ray absorption spectroscopy

M. Merz, P. Schweiss, Th. Wolf +2

X-ray diffraction multipole refinements of single-crystalline Mg $_{x}$ Al $_{1 - x}$ B $_{2}$ and polarization-dependent near-edge x-ray absorption fine structure at the B 1 $s$ edge reveal a…

cond-mat.mtrl-sci2004

Crystal and magnetic structure of La_{1-x}Sr_{1+x}MnO_{4} : role of the orbital degree of freedom

D. Senff, P. Reutler, M. Braden +7

The crystal and magnetic structure of La_{1-x}Sr_{1+x}MnO_4 (0<x<0.7) has been studied by diffraction techniques and high resolution capacitance dilatometry. There is no evidence f…

cond-mat.mes-hall2020

Phonon density of states in lanthanide-based nanocrystals

Z. H. Li, D. Hudry, R. Heid +10

We report a combined inelastic neutron and X-ray scattering study of the phonon density of states of the nano- and microcrystalline lanthanide-based materials NaY $_{0.8}$ Yb$_{0.18}…

cond-mat.str-el2018

Robustness of the charge-ordered phases in IrTe $_{2}$ against photoexcitation

C. Monney, A. Schuler, T. Jaouen +8

We present a time-resolved angle-resolved photoelectron spectroscopy study of IrTe $_{2}$ , which undergoes two first-order structural and charge-ordered phase transitions on cooling b…

cond-mat.supr-con2017

Finite-momentum nematic fluctuations soften phonons in the superconducting state of Ba(Fe $_{1 - x}$ Co $_{x}$ ) $_{2}$ As $_{2}$

F. Weber, D. Parshall, L. Pintschovius +6

Nematic order is ubiquitous in liquid crystals and is characterized by a rotational symmetry breaking in an otherwise uniform liquid. Recently a similar phenomenon has been observe…

Publications (30)

YBa2​Cu3​O7​/La0.7​Ca0.3​MnO3​ bilayers: Interface coupling and electric transport properties

X-ray absorption spectroscopy study of the electronic and magnetic proximity effects in YBa2​Cu3​O7​/La2/3​Ca1/3​MnO3​ and La2−x​Srx​CuO4​/La2/3​Ca1/3​MnO3​ multilayers

Orbital-Resolved Partial Charge Transfer from the Methoxy Groups of Substituted Pyrenes in Complexes with Tetracyanoquinodimethane - a NEXAFS Study

Hybridization of lattice and charge order excitations in a superconducting cuprate

Elastoresistivity in the incommensurate charge density wave phase of BaNi2​(As1-x​Px​)2​

Chemical pressure tuning of competing orders in Ba1−x​Cax​Ni2​As2​