G. Ghiringhelli
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View article: X-ray analysis of Mg <sub>0.2</sub> Co <sub>0.2</sub> Ni <sub>0.2</sub> Cu <sub>0.2</sub> Zn <sub>0.2</sub> O: disentangling elemental contributions in a prototypical high-entropy oxide
X-ray analysis of Mg <sub>0.2</sub> Co <sub>0.2</sub> Ni <sub>0.2</sub> Cu <sub>0.2</sub> Zn <sub>0.2</sub> O: disentangling elemental contributions in a prototypical high-entropy oxide Open
Using a series of X-ray techniques, we study the contributions of individual chemical species to the structural, electronic and magnetic properties of high-entropy oxides.
View article: Photo-generated charge-transfer excitons in NiO revealed by ultrafast time-resolved resonant inelastic x-ray scattering
Photo-generated charge-transfer excitons in NiO revealed by ultrafast time-resolved resonant inelastic x-ray scattering Open
Strong electronic correlation can lead to insulating behavior and to the opening of large optical gaps, even in materials with partly filled valence shells. Although the non-equilibrium optical response encodes both local (quasi atomic) an…
View article: Superconductivity in PrNiO<sub>2</sub> Infinite‐Layer Nickelates
Superconductivity in PrNiO<sub>2</sub> Infinite‐Layer Nickelates Open
Several reports about infinite‐layer nickelate thin films suggest that the superconducting critical temperature versus chemical doping phase diagram has a dome‐like shape, similar to cuprates. Here, a highly reproducible superconducting st…
View article: The influence of phonon symmetry and electronic structure on the electron-phonon coupling momentum dependence in cuprates
The influence of phonon symmetry and electronic structure on the electron-phonon coupling momentum dependence in cuprates Open
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 phonon peaks in Resonant Inelastic X-ray Scattering (RIXS) sp…
View article: The Heisenberg-RIXS instrument at the European XFEL
The Heisenberg-RIXS instrument at the European XFEL Open
Resonant inelastic X-ray scattering (RIXS) is an ideal X-ray spectroscopy method to push the combination of energy and time resolutions to the Fourier transform ultimate limit, because it is unaffected by the core-hole lifetime energy broa…
View article: Signatures of canted antiferromagnetism in infinite-layer nickelates studied by x-ray magnetic dichroism
Signatures of canted antiferromagnetism in infinite-layer nickelates studied by x-ray magnetic dichroism Open
We report an experimental study of the magnetic properties of infinite-layer Nd1-xSrxNiO2 (x=0 and 0.2) thin films by x-ray magnetic circular dichroism (XMCD) at Ni L3,2 and Nd M5,4 edges. We show the presence of a field induced out-of-pla…
View article: Superconductivity in PrNiO2 infinite-layer nickelates
Superconductivity in PrNiO2 infinite-layer nickelates Open
Several reports about infinite-layer nickelate thin films suggest that the superconducting critical temperature versus chemical doping phase diagram has a dome-like shape, similar to cuprates. Here, we demonstrate a highly reproducible sup…
View article: Origin of Magnetism in a Supposedly Nonmagnetic Osmium Oxide
Origin of Magnetism in a Supposedly Nonmagnetic Osmium Oxide Open
A supposedly nonmagnetic 5d1 double perovskite oxide is investigated by a combination of spectroscopic and theoretical methods, namely, resonant inelastic x-ray scattering, x-ray absorption spectroscopy, magnetic circular dichroism, and mu…
View article: Spin excitations in Nd1-xSrxNiO2 and YBa2Cu3O7-delta: the influence of Hubbard U
Spin excitations in Nd1-xSrxNiO2 and YBa2Cu3O7-delta: the influence of Hubbard U Open
We use Resonant Inelastic X-ray Scattering (RIXS) to compare the doping dependence of magnetic excitations of an Infinite-Layer nickelate to those of a prototypical superconducting cuprate. The polarization analysis of RIXS spectra establi…
View article: Signatures of canted antiferromagnetism in infinite-layer nickelates studied by x-ray magnetic dichroism
Signatures of canted antiferromagnetism in infinite-layer nickelates studied by x-ray magnetic dichroism Open
We report an experimental study of the magnetic properties of infinite-layer Nd1-xSrxNiO2 thin films by x-ray magnetic circular dichroism (XMCD) at Ni L3,2 and Nd M5,4 edges. We show that at low temperatures the out-of-plane component of t…
View article: The Heisenberg-RIXS instrument at the European XFEL
The Heisenberg-RIXS instrument at the European XFEL Open
Resonant Inelastic X-ray Scattering (RIXS) is an ideal X-ray spectroscopy method to push the combination of energy and time resolutions to the Fourier transform ultimate limit, because it is unaffected by the core-hole lifetime energy broa…
View article: Collective Nature of Orbital Excitations in Layered Cuprates in the Absence of Apical Oxygens
Collective Nature of Orbital Excitations in Layered Cuprates in the Absence of Apical Oxygens Open
We have investigated the 3d orbital excitations in CaCuO_{2} (CCO), Nd_{2}CuO_{4} (NCO), and La_{2}CuO_{4} (LCO) using high-resolution resonant inelastic x-ray scattering. In LCO they behave as well-localized excitations, similarly to seve…
View article: The origin of magnetism in a supposedly nonmagnetic osmium oxide
The origin of magnetism in a supposedly nonmagnetic osmium oxide Open
A supposedly nonmagnetic 5d$^1$ double perosvkite oxide is investigated by a combination of spectroscopic and theoretical methods, namely resonant inelastic X-ray scattering, X-ray absorption spectroscopy, magnetic circular dichroism, and …
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: Charge response function probed by resonant inelastic x-ray scattering: the signature of electronic gaps of YBa$_2$Cu$_3$O$_{7-δ}$
Charge response function probed by resonant inelastic x-ray scattering: the signature of electronic gaps of YBa$_2$Cu$_3$O$_{7-δ}$ Open
In strongly correlated systems the complete determination of the dynamical susceptibility $χ(\textbf{q}, ω)$ is of special relevance because of the entwinement of the spin and charge components. Although Resonant Inelastic X-Ray Scattering…
View article: Collective nature of orbital excitations in layered cuprates in the absence of apical oxygens
Collective nature of orbital excitations in layered cuprates in the absence of apical oxygens Open
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 well-localized excitations, similarly to several other cupra…
View article: Absence of localized $5d^1$ electrons in KTaO$_3$ interface superconductors
Absence of localized $5d^1$ electrons in KTaO$_3$ interface superconductors Open
Recently, an exciting discovery of orientation-dependent superconductivity was made in two-dimensional electron gas (2DEG) at the interfaces of LaAlO$_3$/KTaO$_3$ (LAO/KTO) or EuO/KTaO$_3$ (EuO/KTO). The superconducting transition temperat…
View article: Identification of a characteristic doping for charge order phenomena in Bi-2212 cuprates via RIXS
Identification of a characteristic doping for charge order phenomena in Bi-2212 cuprates via RIXS Open
Identifying quantum critical points (QCPs) and their associated fluctuations may hold the key to unraveling the unusual electronic phenomena observed in cuprate superconductors. Recently, signatures of quantum fluctuations associated with …
View article: Signature of quantum criticality in cuprates by charge density fluctuations
Signature of quantum criticality in cuprates by charge density fluctuations Open
The universality of the strange metal phase in many quantum materials is often attributed to the presence of a quantum critical point (QCP), a zero-temperature phase transition ruled by quantum fluctuations. In cuprates, where superconduct…
View article: Ferromagnetic Quasi-Two-Dimensional Electron Gas with Trigonal Crystal Field Splitting
Ferromagnetic Quasi-Two-Dimensional Electron Gas with Trigonal Crystal Field Splitting Open
Interfacial inversion symmetry breaking gives rise to electronic properties that differ substantially from those of the bulk constituent materials. Here, we report on the realization of an artificial ferromagnetic quasi-two-dimensional ele…
View article: Doping dependence of the electron-phonon coupling in two families of bilayer superconducting cuprates
Doping dependence of the electron-phonon coupling in two families of bilayer superconducting cuprates Open
While electron-phonon coupling (EPC) is crucial for Cooper pairing in conventional superconductors, its role in high-Tc superconducting cuprates is debated. Using resonant inelastic x-ray scattering at the oxygen K edge, we study the EPC i…
View article: Prediction of ambient-pressure superconductivity in ternary hydride PdCuH<i>x</i>
Prediction of ambient-pressure superconductivity in ternary hydride PdCuH<i>x</i> Open
We present an ab initio study of the ternary hydride PdCuHx, a parent compound of the superconducting PdH, at different hydrogen content (x=1,2). We investigate its structural, electronic, dynamical, and superconducting properties, demonst…
View article: Charge and spin order dichotomy in NdNiO$_2$ driven by SrTiO$_3$ capping layer
Charge and spin order dichotomy in NdNiO$_2$ driven by SrTiO$_3$ capping layer Open
Superconductivity in infinite-layer nickelates holds exciting analogies with that of cuprates, with similar structures and $3d$-electron count. Using resonant inelastic x-ray scattering (RIXS) we studied electronic and magnetic excitations…
View article: Fractional spin excitations in the infinite-layer cuprate CaCuO$_2$
Fractional spin excitations in the infinite-layer cuprate CaCuO$_2$ Open
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 magnon decays into a broad continuum of excitations accounting …
View article: Charge Order at High Temperature in Cuprate Superconductors
Charge Order at High Temperature in Cuprate Superconductors Open
The presence of different electronic orders other than superconductivity populating the phase diagram of cuprates suggests that they might be the key to disclose the mysteries of this class of materials. In particular charge order in the f…
View article: Orbital selective switching of ferromagnetism in an oxide quasi two-dimensional electron gas
Orbital selective switching of ferromagnetism in an oxide quasi two-dimensional electron gas Open
Multi-orbital physics in quasi-two-dimensional electron gases (q2DEGs) triggers unique phenomena not observed in bulk materials, such as unconventional superconductivity and magnetism. Here, we investigate the mechanism of orbital selectiv…
View article: Evolution of spin excitations from bulk to monolayer FeSe
Evolution of spin excitations from bulk to monolayer FeSe Open
In ultrathin films of FeSe grown on SrTiO 3 (FeSe/STO), the superconducting transition temperature T c is increased by almost an order of magnitude, raising questions on the pairing mechanism. As in other superconductors, antiferromagnetic…