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Publications (38)

cond-mat.str-el2026

Direct High-Magnetic-Field Coupling to Stripe Order in a Cuprate Superconductor

Leonardo Martinelli, Izabela BiaÅo, Jens Oppliger +47

Superconductivity in cuprates emerges out of a complex normal state that hosts density waves, pseudogap physics, and strange metal properties. Here, we access this normal state by…

cond-mat.mtrl-sci2017

Structure, site-specific magnetism and magneto-transport properties of epitaxial D0 $_{22}$ Mn $_{2}$ Fe $_{x}$ Ga thin films

Davide Betto, Yong-Chang Lau, Kiril Borisov +5

Ferrimagnetic Mn $_{2}$ Fe $_{x}$ Ga $(0.26 \leq x \leq 1.12)$ thin films have been characterised by X-ray diffraction, SQUID magnetometry, X-ray absorption spectroscopy, X-ray magnetic ci…

cond-mat.mtrl-sci2012

Using a dual plasma process to produce cobalt--polypyrrole catalysts for the oxygen reduction reaction in fuel cells -- part II: analysing the chemical structure of the films

Christian Walter, Kurt Kummer, Denis Vyalikh +3

The chemical structure of cobalt--polypyrrole -- produced by a dual plasma process -- is analysed by means of X-ray photoelectron spectroscopy (XPS), near edge X-ray absorption spe…

cond-mat.str-el2018

Determining the local low-energy excitations in the Kondo semimetal CeRu $_{4}$ Sn $_{6}$ using resonant inelastic x-ray scattering

Andrea Amorese, Kurt Kummer, Nickolas B. Brookes +11

We have investigated the local low-energy excitations in CeRu $_{4}$ Sn $_{6}$ , a material discussed recently in the framework of strongly correlated Weyl semimetals, by means of Ce $M_{5}$ …

cond-mat.mtrl-sci2025

X-raying Mg0.2Co0.2Ni0.2Cu0.2Zn0.2O: disentangling elemental contributions in a prototypical high-entropy oxide

Maryia Zinouyeva, Martina Fracchia, Giulia Maranini +10

We employ several X-ray based techniques, including X-ray diffraction, absorption and resonant inelastic scattering, to disentangle the contributions of individual chemical species…

cond-mat.str-el2024

Collective nature of orbital excitations in layered cuprates in the absence of apical oxygens

Leonardo Martinelli, Krzysztof Wohlfeld, Jonathan Pelliciari +19

We have investigated the 3d orbital excitations in CaCuO2 (CCO), Nd2CuO4 (NCO), and La2CuO4 (LCO) using high-resolution resonant inelastic x-ray scattering. In LCO they behave as w…

cond-mat.str-el2025

Weak Itinerant Ferromagnetism (WIFM) in MAX phase compound Cr $_{1.9}$ Fe $_{0.1}$ GeC

Suman Mondal, Mohamad Numan, Kurt Kummer +2

Magnetic MAX phase compounds are important materials for studying the two-dimensional magnetism because of their layered crystallographic structure. The hexagonal MAX phase compoun…

cond-mat.str-el2025

Magnetic frustration and weak Mn magnetic ordering in EuMn $_{2}$ P $_{2}$

Sarah Krebber, JÃ¶rg Sichelschmidt, Pierre Chailloleau +8

We report on the electron spin resonance (ESR), heat capacity, magnetization, nuclear magnetic resonance (NMR), magnetic circular and linear dichroism (XMCD, XMLD), as well as the…

cond-mat.supr-con2019

Experimental Determination of Momentum-Resolved Electron-Phonon Coupling

Matteo Rossi, Riccardo Arpaia, Roberto Fumagalli +9

We provide a novel experimental method to quantitatively estimate the electron-phonon coupling and its momentum dependence from resonant inelastic x-ray scattering (RIXS) spectra b…

cond-mat.str-el2024

Spin waves and orbital contribution to ferromagnetism in a topological metal

Wenliang Zhang, Teguh Citra Asmara, Yi Tseng +11

Special arrangements of atoms with more than one atom per unit cell, including honeycomb or kagome (woven bamboo mat) lattices, can host propagating excitations with non-trivial to…

cond-mat.str-el2022

Investigation of metamagnetism and crystal-field splitting in pseudo-hexagonal CeRh $_{3}$ Si $_{2}$

Andrea Amorese, Dmitry Khalyavin, Kurt Kummer +11

CeRh $_{3}$ Si $_{2}$ has been reported to exhibit metamagnetic transitions below 5~K, a giant crystal field splitting, and anisotropic magnetic properties from single crystal magnetizati…

cond-mat.str-el2017

Dispersive charge density wave excitations and temperature dependent commensuration in Bi2Sr2CaCu2O8+Î´

Laura Chaix, Giacomo Ghiringhelli, Yingying Peng +14

Experimental evidence on high-Tc cuprates reveals ubiquitous charge density wave (CDW) modulations, which coexist with superconductivity. Although the CDW had been predicted by the…

cond-mat.mtrl-sci2009

Dynamics of graphene growth on a metal surface: a time-dependent photoemission study

Alexander GrÃ¼neis, Kurt Kummer, Denis V. Vyalikh

Applying time-dependent photoemission we unravel the graphene growth process on a metallic surface by chemical vapor deposition (CVD). Graphene CVD growth is in stark contrast to t…

physics.chem-ph2012

Using a dual plasma process to produce cobalt--polypyrrole catalysts for the oxygen reduction reaction in fuel cells -- part I: characterisation of the catalytic activity and surface structure

Christian Walter, Kurt Kummer, Denis Vyalikh +3

A new dual plasma coating process to produce platinum-free catalysts for the oxygen reduction reaction in a fuel cell is introduced. The catalysts thus produced were analysed with…

cond-mat.str-el2025

The influence of phonon symmetry and electronic structure on the electron-phonon coupling momentum dependence in cuprates

Maryia Zinouyeva, Rolf Heid, Giacomo Merzoni +16

The experimental determination of the magnitude and momentum dependence of electron-phonon coupling (EPC) is an outstanding problem in condensed matter physics. The intensity of ph…

cond-mat.supr-con2026

Doping evolution of spin excitations in La $_{3 - x}$ Sr $_{x}$ Ni $_{2}$ O $_{7}$ /SrLaAlO $_{4}$ superconducting thin films

Hengyang Zhong, Bo Hao, Anni Chen +11

Ambient-pressure superconductivity in compressively strained bilayer nickelate films provides a unique platform to test pairing scenarios, yet the evolution of magnetism with carri…

cond-mat.mtrl-sci2025

Voltage-driven 90 switching of bulk perpendicular magnetic anisotropy in ferrimagnets

Zhengyu Xiao, Ruiwen Xie, Fernando Maccari +18

Unravelling the mechanism behind bulk perpendicular magnetic anisotropy (PMA) in amorphous rare earth-transition metal films has proven challenging. This is largely due to the inhe…

cond-mat.str-el2021

Fractional spin excitations in the infinite-layer cuprate CaCuO $_{2}$

Leonardo Martinelli, Davide Betto, Kurt Kummer +6

We use resonant inelastic x-ray scattering (RIXS) to investigate the magnetic dynamics of the infinite-layer cuprate CaCuO2. We find that close to the (1/2,0) point the single magn…

cond-mat.str-el2013

Strong ferromagnetism at the surface of an antiferromagnet caused by buried magnetic moments

Alla Chikina, Marc HÃ¶ppner, Silvia Seiro +13

Carrying a large, pure spin magnetic moment of 7 $I^¼$ bohr/atom in the half-filled 4f shell, divalent europium is an outstanding element for assembling novel magnetic devices in whi…

cond-mat.supr-con2020

Determining the Electron-Phonon Coupling in Superconducting Cuprates by Resonant Inelastic X-ray Scattering: Methods and Results on Nd $_{1 + x}$ Ba $_{2 - x}$ Cu $_{3}$ O $_{7 - I^´}$

Lucio Braicovich, Matteo Rossi, Roberto Fumagalli +15

The coupling between lattice vibration quanta and valence electrons can induce charge density modulations and decisively influence the transport properties of materials, e.g. leadi…

cond-mat.supr-con2026

Orbital Ordering in the Charge Density Wave Phases of BaNi $_{2}$ (As $_{1 - x}$ P $_{x}$ ) $_{2}$

Tom Lacmann, Robert Eder, Igor Vinograd +8

We use resonant X-ray scattering at the nickel L $_{2, 3}$ edges to investigate the interplay between orbital degrees of freedom and charge density waves (CDW) in the superconductor…

cond-mat.str-el2023

Orbital selective coupling in CeRh $_{3}$ B $_{2}$ : co-existence of high Curie and high Kondo temperature

Andrea Amorese, Philipp Hansmann, Andrea Marino +12

We investigated the electronic structure of the enigmatic CeRh $_{3}$ B $_{2}$ using resonant inelastic scattering and x-ray absorption spectroscopy in combination with $ab$ $ini t i o$ dens…

cond-mat.mtrl-sci2025

Temperature dependent Resonant X-ray Inelastic Scattering at Ni L3-edge for NaNiO2 and LiNiO2

Quentin Jacquet, Kurt Kummer, Marie Guignard +4

LiNiO2 is a promising cathode material for Li-ion battery but its atomic and electronic structure is under debate. Indeed, two sets of Ni-O distances are identified from local stru…

cond-mat.str-el2019

A RIXS investigation of the crystal-field splitting of Sm $^{3 +}$ in SmB $_{6}$

Andrea Amorese, Oliver Stockert, Kurt Kummer +7

The crystal-field (CF) splitting of the $^{6} H_{5/2}$ Hund's rule ground state of Sm $^{3 +}$ in the strongly correlated topological insulator SmB $_{6}$ has been determined with high res…

cond-mat.mtrl-sci2025

Chiral Altermagnon in MnTe

Daniel Jost, Resham B. Regmi, Eder G. Lomeli +12

Altermagnetism has surfaced as a novel magnetic phase, bridging the properties of ferro- and anti-ferromagnetism. The momentum-dependent spin-splitting observed in these materials…

cond-mat.str-el2023

Detection of a two-phonon mode in a cuprate superconductor via polarimetric RIXS

Kirsty Scott, Elliot Kisiel, Flora Yakhou +15

Recent improvements in the energy resolution of resonant inelastic x-ray scattering experiments (RIXS) at the Cu-L $_{3}$ edge have enabled the study of lattice, spin, and charge exci…

cond-mat.str-el2023

Colossal magnetoresistance in EuZn $_{2}$ P $_{2}$ and its electronic and magnetic structure

Sarah Krebber, Marvin Kopp, Charu Garg +15

We investigate single crystals of the trigonal antiferromagnet EuZn $_{2}$ P $_{2}$ ( $P 3 m 1$ ) by means of electrical transport, magnetization measurements, X-ray magnetic scatte…

cond-mat.mtrl-sci2026

Electric field switching of chiral phonons

Michael Grimes, Clifford J. Allington, Hiroki Ueda +8

Lattice vibrations carrying angular momentum, known as chiral phonons, have emerged as a promising route to control and understand complex material properties, yet their determinis…

cond-mat.mtrl-sci2026

Ligand Mediated Magnetic Coupling Across Metamagnetic Transitions in CrPS4

Giuseppe Buccoliero, Rachel Nickel, Roberto Sant +8

Chromium thiophosphate (CrPS4) is a long-known material: a layered semiconducting antiferromagnet. Its recently discovered gate-tunable metamagnetic phase transitions, the remarkab…

cond-mat.str-el2025

Crystal field excitations in rattling clathrate CeBa $_{7}$ Au $_{6}$ Si $_{40}$

Michelangelo Tagliavini, Federico Mazza, Xinlin Yan +6

We investigate the local crystal-field environment of cerium in the clathrate compound CeBa $_{7}$ Au $_{6}$ Si $_{40}$ (Ce-BAS) using resonant inelastic x-ray scattering (RIXS) and magneti…

cond-mat.str-el2019

Charge, lattice and magnetism across the valence crossover in EuIr $_{2}$ Si $_{2}$ single crystals

Silvia Seiro, Yurii Prots, Kurt Kummer +3

We present a detailed study of the temperature evolution of the crystal structure, specific heat, magnetic susceptibility and resistivity of single crystals of the paradigmatic val…

cond-mat.supr-con2022

Identification of a Critical Doping for Charge Order Phenomena in Bi-2212 Cuprates via RIXS

Haiyu Lu, Makoto Hashimoto, Su-Di Chen +16

Identifying quantum critical points (QCPs) and their associated fluctuations may hold the key to unraveling the unusual electronic phenomena observed in cuprate superconductors. Re…

cond-mat.supr-con2026

Spin correlations in La $_{3}$ Ni $_{2}$ O $_{7}$ thin films

Hengyang Zhong, Bo Hao, Zhijia Zhang +15

The discovery of ambient-pressure superconductivity with $T_{c, onset} > 40$ K in La $_{3}$ Ni $_{2}$ O $_{7}$ (LNO) thin films grown on the SrLaAlO $_{4}$ (SLAO) substrate with compressiv…

cond-mat.str-el2026

Machine-learning test of the single-ion model for $dd$ excitations in cuprates

Maryia Zinouyeva, Leonardo Martinelli, Riccardo Arpaia +12

We investigate $dd$ excitations in Resonant Inelastic X-ray Scattering spectra of YBa $_{2}$ Cu $_{3}$ O $_{6}$ and La $_{2}$ CuO $_{4}$ using the local single-ion model. The data are analyzed by co…

cond-mat.mtrl-sci2024

Controlling 4f antiferromagnetic dynamics via itinerant electronic susceptibility

Sang-Eun Lee, Yoav William Windsor, Daniela Zahn +10

Optical manipulation of magnetism holds promise for future ultrafast spintronics, especially with lanthanides and their huge, localized 4f magnetic moments. These moments interact…

cond-mat.str-el2024

Physical properties of the ferromagnetic quantum critical system YbNi $_{4}$ (P $_{1 - x}$ As $_{x}$ ) $_{2}$

Kristin Kliemt, Jacintha Banda, Pavlo Khanenko +6

We report on single crystal growth and physical properties of the quantum critical Kondo-lattice system YbNi $_{4}$ (P $_{1 - x}$ As $_{x}$ ) $_{2}$ with $0 \leq x \leq 1$ which hosts a ferromagn…

cond-mat.str-el2024

Composite antiferromagnetic and orbital order with altermagnetic properties at a cuprate/manganite interface

Subhrangsu Sarkar, Roxana Capu, Yurii G. Pashkevich +12

Heterostructures from complex oxides allow one to combine various electronic and magnetic orders as to induce new quantum states. A prominent example is the coupling between superc…

cond-mat.mtrl-sci2021

A full gap above the Fermi level: the charge density wave of monolayer VS2

Camiel van Efferen, Jan Berges, Joshua Hall +15

In the standard model of charge density wave (CDW) transitions, the displacement along a single phonon mode lowers the total electronic energy by creating a gap at the Fermi level,…

Publications (38)

Direct High-Magnetic-Field Coupling to Stripe Order in a Cuprate Superconductor

Structure, site-specific magnetism and magneto-transport properties of epitaxial D022​ Mn2​Fex​Ga thin films

Using a dual plasma process to produce cobalt--polypyrrole catalysts for the oxygen reduction reaction in fuel cells -- part II: analysing the chemical structure of the films

Determining the local low-energy excitations in the Kondo semimetal CeRu4​Sn6​ using resonant inelastic x-ray scattering

X-raying Mg0.2Co0.2Ni0.2Cu0.2Zn0.2O: disentangling elemental contributions in a prototypical high-entropy oxide

Collective nature of orbital excitations in layered cuprates in the absence of apical oxygens

Weak Itinerant Ferromagnetism (WIFM) in MAX phase compound Cr1.9​Fe0.1​GeC

Magnetic frustration and weak Mn magnetic ordering in EuMn2​P2​

Experimental Determination of Momentum-Resolved Electron-Phonon Coupling

Spin waves and orbital contribution to ferromagnetism in a topological metal

Investigation of metamagnetism and crystal-field splitting in pseudo-hexagonal CeRh3​Si2​

Dispersive charge density wave excitations and temperature dependent commensuration in Bi2Sr2CaCu2O8+Î´

Dynamics of graphene growth on a metal surface: a time-dependent photoemission study

Using a dual plasma process to produce cobalt--polypyrrole catalysts for the oxygen reduction reaction in fuel cells -- part I: characterisation of the catalytic activity and surface structure

The influence of phonon symmetry and electronic structure on the electron-phonon coupling momentum dependence in cuprates

Doping evolution of spin excitations in La3−x​Srx​Ni2​O7​/SrLaAlO4​ superconducting thin films

Voltage-driven 90 switching of bulk perpendicular magnetic anisotropy in ferrimagnets

Fractional spin excitations in the infinite-layer cuprate CaCuO2​

Strong ferromagnetism at the surface of an antiferromagnet caused by buried magnetic moments

Determining the Electron-Phonon Coupling in Superconducting Cuprates by Resonant Inelastic X-ray Scattering: Methods and Results on Nd1+x​Ba2−x​Cu3​O7−I^´​

Orbital Ordering in the Charge Density Wave Phases of BaNi2​(As1−x​Px​)2​

Orbital selective coupling in CeRh3​B2​: co-existence of high Curie and high Kondo temperature

Temperature dependent Resonant X-ray Inelastic Scattering at Ni L3-edge for NaNiO2 and LiNiO2

A RIXS investigation of the crystal-field splitting of Sm3+ in SmB6​

Chiral Altermagnon in MnTe

Detection of a two-phonon mode in a cuprate superconductor via polarimetric RIXS

Colossal magnetoresistance in EuZn2​P2​ and its electronic and magnetic structure

Electric field switching of chiral phonons

Ligand Mediated Magnetic Coupling Across Metamagnetic Transitions in CrPS4

Crystal field excitations in rattling clathrate CeBa7​Au6​Si40​

Charge, lattice and magnetism across the valence crossover in EuIr2​Si2​ single crystals

Identification of a Critical Doping for Charge Order Phenomena in Bi-2212 Cuprates via RIXS

Spin correlations in La3​Ni2​O7​ thin films

Machine-learning test of the single-ion model for dd excitations in cuprates

Controlling 4f antiferromagnetic dynamics via itinerant electronic susceptibility

Physical properties of the ferromagnetic quantum critical system YbNi4​(P1−x​Asx​)2​

Composite antiferromagnetic and orbital order with altermagnetic properties at a cuprate/manganite interface

A full gap above the Fermi level: the charge density wave of monolayer VS2

Structure, site-specific magnetism and magneto-transport properties of epitaxial D0 $_{22}$ Mn $_{2}$ Fe $_{x}$ Ga thin films

Determining the local low-energy excitations in the Kondo semimetal CeRu $_{4}$ Sn $_{6}$ using resonant inelastic x-ray scattering

Weak Itinerant Ferromagnetism (WIFM) in MAX phase compound Cr $_{1.9}$ Fe $_{0.1}$ GeC

Magnetic frustration and weak Mn magnetic ordering in EuMn $_{2}$ P $_{2}$

Investigation of metamagnetism and crystal-field splitting in pseudo-hexagonal CeRh $_{3}$ Si $_{2}$

Doping evolution of spin excitations in La $_{3 - x}$ Sr $_{x}$ Ni $_{2}$ O $_{7}$ /SrLaAlO $_{4}$ superconducting thin films

Fractional spin excitations in the infinite-layer cuprate CaCuO $_{2}$

Determining the Electron-Phonon Coupling in Superconducting Cuprates by Resonant Inelastic X-ray Scattering: Methods and Results on Nd $_{1 + x}$ Ba $_{2 - x}$ Cu $_{3}$ O $_{7 - I^´}$

Orbital Ordering in the Charge Density Wave Phases of BaNi $_{2}$ (As $_{1 - x}$ P $_{x}$ ) $_{2}$

Orbital selective coupling in CeRh $_{3}$ B $_{2}$ : co-existence of high Curie and high Kondo temperature

A RIXS investigation of the crystal-field splitting of Sm $^{3 +}$ in SmB $_{6}$

Colossal magnetoresistance in EuZn $_{2}$ P $_{2}$ and its electronic and magnetic structure

Crystal field excitations in rattling clathrate CeBa $_{7}$ Au $_{6}$ Si $_{40}$

Charge, lattice and magnetism across the valence crossover in EuIr $_{2}$ Si $_{2}$ single crystals

Spin correlations in La $_{3}$ Ni $_{2}$ O $_{7}$ thin films

Machine-learning test of the single-ion model for $dd$ excitations in cuprates

Physical properties of the ferromagnetic quantum critical system YbNi $_{4}$ (P $_{1 - x}$ As $_{x}$ ) $_{2}$