E. Schierle
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View article: Oxygen sublattice disorder and valence state modulation in infinite-layer nickelate superlattices
Oxygen sublattice disorder and valence state modulation in infinite-layer nickelate superlattices Open
The family of infinite-layer nickelates promises important insights into the mechanism of unconventional superconductivity. Since superconductivity has so far only been observed in epitaxial thin films, heteroepitaxy with the substrate or …
View article: Oxygen sublattice disorder and valence state modulation in infinite-layer nickelate superlattices
Oxygen sublattice disorder and valence state modulation in infinite-layer nickelate superlattices Open
The family of infinite-layer nickelates promises important insights into the mechanism of unconventional superconductivity. Since superconductivity has so far only been observed in epitaxial thin films, heteroepitaxy with the substrate or …
View article: Nodeless Hybridization as Proof of Trivial Topology in Samarium Hexaboride
Nodeless Hybridization as Proof of Trivial Topology in Samarium Hexaboride Open
Calculations unanimously predict samarium hexaboride to be a topological Kondo insulator, the first topological insulator driven by strong electron correlation. As of today it appears also experimentally established as the only representat…
View article: Epitaxial superlattices as a framework for stabilizing different <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>LaNiO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math> structures
Epitaxial superlattices as a framework for stabilizing different structures Open
Targeted material design is at the center of research efforts on epitaxial, complex oxide heterostructures. Due to the strong electron-lattice coupling, small structural modifications are often decisive for the resulting macroscopic, physi…
View article: Signature of quantum criticality in cuprates by charge density fluctuations
Signature of quantum criticality in cuprates by charge density fluctuations Open
[This repository contains the raw data for the manuscript "Signature of quantum criticality in cuprates by charge density fluctuations" (arXiv:2208.13918)] The universality of the strange metal phase in many quantum materials is often attr…
View article: Signature of quantum criticality in cuprates by charge density fluctuations
Signature of quantum criticality in cuprates by charge density fluctuations Open
[This repository contains the raw data for the manuscript "Signature of quantum criticality in cuprates by charge density fluctuations" (arXiv:2208.13918)] The universality of the strange metal phase in many quantum materials is often attr…
View article: Discovery of charge order in a cuprate Mott insulator
Discovery of charge order in a cuprate Mott insulator Open
Copper oxide superconductors universally exhibit multiple forms of electronically ordered phases that break the native translational symmetry of the CuO 2 planes. In underdoped cuprates with correlated metallic ground states, charge/spin s…
View article: Spin-carrier coupling induced ferromagnetism and giant resistivity peak in EuCd$_2$P$_2$
Spin-carrier coupling induced ferromagnetism and giant resistivity peak in EuCd$_2$P$_2$ Open
EuCd$_2$P$_2$ is notable for its unconventional transport: upon cooling the metallic resistivity changes slope and begins to increase, ultimately 100-fold, before returning to its metallic value. Surprisingly, this giant peak occurs at 18K…
View article: Antiferromagnetic order in Co-doped Fe$_5$GeTe$_2$ probed by resonant magnetic x-ray scattering
Antiferromagnetic order in Co-doped Fe$_5$GeTe$_2$ probed by resonant magnetic x-ray scattering Open
The quasi-two-dimensional van der Waals magnet Fe$_{5-δ}$GeTe$_2$ has emerged as a promising platform for electronic and spintronic functionalities at room temperature, owing to its large ferromagnetic ordering temperature $T_{\text{C}}$ $…
View article: Discovery of an electronic crystal in a cuprate Mott insulator
Discovery of an electronic crystal in a cuprate Mott insulator Open
Copper oxide high temperature superconductors universally exhibit multiple forms of electronically ordered phases that break the native translational symmetry of the CuO2 planes. The interplay between these orders and the superconducting g…
View article: Oxygen Hole Character and Lateral Homogeneity in PrNiO2+δ Thin Films
Oxygen Hole Character and Lateral Homogeneity in PrNiO2+δ Thin Films Open
Using x-ray absorption spectroscopy with lateral resolution from the submillimeter to submicrometer range, we investigate the homogeneity, the chemical composition, and the nickel 3 d - oxygen 2 p charge transfer in topotactically reduced …
View article: Superlattice approach to doping infinite-layer nickelates
Superlattice approach to doping infinite-layer nickelates Open
The recent observation of superconductivity in infinite-layer Nd$_{1-x}$Sr$_x$NiO$_2$ thin films has attracted a lot of attention, since this compound is electronically and structurally analogous to the superconducting cuprates. Due to the…
View article: Magnetization relaxation and search for the magnetic gap in bulk-insulating V-doped (Bi, Sb)2Te3
Magnetization relaxation and search for the magnetic gap in bulk-insulating V-doped (Bi, Sb)2Te3 Open
V-doped (Bi,Sb)2Te3 has a ten times higher magnetic coercivity than its Cr-doped counterpart and, therefore, is believed to be advantageous for the quantum anomalous Hall effect (QAHE). The QAHE requires the opening of a magnetic bandgap a…
View article: Mn‐Rich MnSb<sub>2</sub>Te<sub>4</sub>: A Topological Insulator with Magnetic Gap Closing at High Curie Temperatures of 45–50 K
Mn‐Rich MnSb<sub>2</sub>Te<sub>4</sub>: A Topological Insulator with Magnetic Gap Closing at High Curie Temperatures of 45–50 K Open
Ferromagnetic topological insulators exhibit the quantum anomalous Hall effect, which is potentially useful for high‐precision metrology, edge channel spintronics, and topological qubits. The stable 2+ state of Mn enables intrinsic magneti…
View article: Large response of charge stripes to uniaxial stress in $\textrm{La}_{1.475}\textrm{Nd}_{0.4}\textrm{Sr}_{0.125}\textrm{Cu}\textrm{O}_{4}$
Large response of charge stripes to uniaxial stress in $\textrm{La}_{1.475}\textrm{Nd}_{0.4}\textrm{Sr}_{0.125}\textrm{Cu}\textrm{O}_{4}$ Open
The La-based '214' cuprates host several symmetry breaking phases including superconductivity, charge and spin order in the form of stripes, and a structural othorhombic-to-tetragonal phase transition. Therefore, these materials are an ide…
View article: Transition from a uni- to a bimodal interfacial charge distribution in $$\hbox {LaAlO}_3$$/$$\hbox {SrTiO}_3$$ upon cooling
Transition from a uni- to a bimodal interfacial charge distribution in $$\hbox {LaAlO}_3$$/$$\hbox {SrTiO}_3$$ upon cooling Open
We present a combined resonant soft X-ray reflectivity and electric transport study of $$\hbox {LaAlO}_3$$ / $$\hbox {SrTiO}_3$$ field effect devices. The depth profiles with atomic layer resolution that are obtained from the reson…
View article: Field-induced double spin spiral in a frustrated chiral magnet
Field-induced double spin spiral in a frustrated chiral magnet Open
Magnetic ground states with peculiar spin textures, such as magnetic skyrmions and multifunctional domains are of enormous interest for the fundamental physics governing their origin as well as potential applications in emerging technologi…
View article: Selective probing of magnetic order on Tb and Ir sites in stuffed Tb<sub>2</sub>Ir<sub>2</sub>O<sub>7 </sub> using resonant x-ray scattering
Selective probing of magnetic order on Tb and Ir sites in stuffed Tb<sub>2</sub>Ir<sub>2</sub>O<sub>7 </sub> using resonant x-ray scattering Open
We study the magnetic structure of the ‘stuffed’ (Tb-rich) pyrochlore iridate Tb 2+ x Ir 2− x O 7− y ( x ∼ 0.18), using resonant elastic x-ray scattering (REXS). In order to disentangle contributions from Tb and Ir magnetic sublattices, ex…
View article: Resonant inelastic x-ray scattering study of bond order and spin excitations in nickelate thin-film structures
Resonant inelastic x-ray scattering study of bond order and spin excitations in nickelate thin-film structures Open
We used high-resolution resonant inelastic x-ray scattering (RIXS) at the Ni $L_3$ edge to simultaneously investigate high-energy interband transitions characteristic of Ni-O bond ordering and low-energy collective excitations of the Ni sp…
View article: Field-induced double spin spiral in a frustrated chiral magnet
Field-induced double spin spiral in a frustrated chiral magnet Open
We report the direct observation of a magnetic-feld induced long-wavelength spin spiral modulation in the chiral compound Ba3TaFe3Si2O14. This new spin texture emerges out of a chiral helical ground state, and is hallmarked by the onset of…
View article: Enhancement of spin-orbit coupling at manganite surfaces
Enhancement of spin-orbit coupling at manganite surfaces Open
Spin-orbit coupling in magnetic systems lacking inversion symmetry can give rise to non trivial spin textures. Magnetic thin films and heterostructures are potential candidates for the formation of skyrmions and other non-collinear spin co…
View article: Spin-orbit effects surfacing on manganites
Spin-orbit effects surfacing on manganites Open
Spin-orbit coupling in magnetic systems lacking inversion symmetry can give rise to non trivial spin textures. Magnetic thin films and heterostructures are potential candidates for the formation of skyrmions and other non-collinear spin co…
View article: Digital modulation of the nickel valence state in a cuprate-nickelate heterostructure
Digital modulation of the nickel valence state in a cuprate-nickelate heterostructure Open
Layer-by-layer oxide molecular beam epitaxy has been used to synthesize\ncuprate-nickelate multilayer structures of composition\n(La$_2$CuO$_4$)$_m$/LaO/(LaNiO$_3$)$_n$. In a combined experimental and\ntheoretical study, we show that these…
View article: The UE46 PGM-1 beamline at BESSY II
The UE46 PGM-1 beamline at BESSY II Open
The UE46 PGM-1 undulator beamline at the BESSY II storage ring provides soft x-rays of tunable polarization, linear and circular. With two permanent endstations, a versatile XUV diffractometer and a 7-Tesla High-Field diffractometer, the s…