Stefano Agrestini
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View article: Circular Dichroism in Resonant Inelastic X-Ray Scattering: Probing Altermagnetic Domains in MnTe
Circular Dichroism in Resonant Inelastic X-Ray Scattering: Probing Altermagnetic Domains in MnTe Open
X-ray magnetic circular dichroism provides a means to identify ferromagnetic, chiral, and altermagnetic orders via their time-reversal-symmetry ( T ) breaking. However, the symmetry properties that govern circular dichroism (CD) in resonan…
Systematic mapping of altermagnetic magnons by resonant inelastic X-ray circular dichroism Open
Altermagnets, a unique class of magnetic materials that combines features of both ferromagnets and antiferromagnets, have garnered attention for their potential in spintronics and magnonics. While the electronic properties of altermagnets …
The doping evolution of the charge density wave and charge density fluctuations in La$_{2-x}$Sr$_x$CuO$_4$ Open
Cuprate superconductors show various collective charge correlations that are intimately connected with their electronic properties. In particular, charge order in the form of an incommensurate charge density wave (CDW) order with an in-pla…
View article: Low energy excitations in A-site ordered SmBaMn2O6
Low energy excitations in A-site ordered SmBaMn2O6 Open
The electron in a solid can be considered a bound state of the three independent, fundamental degrees of freedom creating quasi-particles: spinons, carrying the electron spin; plasmons carrying the collective charge mode and orbitons carry…
View article: Decoupling of static and dynamic charge correlations revealed by uniaxial strain in a cuprate superconductor
Decoupling of static and dynamic charge correlations revealed by uniaxial strain in a cuprate superconductor Open
We use uniaxial strain in combination with ultra-high-resolution resonant inelastic x-ray scattering (RIXS) at the oxygen-K and copper-L3 edges to study the excitations stemming from the charge ordering wave vector in La1.875Sr0.125CuO4. B…
Orbital inversion and emergent lattice dynamics in infinite layer CaCoO2 Open
The layered cobaltate CaCoO 2 exhibits a unique herringbone-like structure. Serving as a potential prototype for a new class of complex lattice patterns, we study the properties of CaCoO 2 using X-ray absorption spectroscopy (XAS) and reso…
View article: Circular dichroism in resonant inelastic x-ray scattering from birefringence in CuO
Circular dichroism in resonant inelastic x-ray scattering from birefringence in CuO Open
Resonant inelastic x-ray scattering (RIXS) has become a prominent technique to study quasiparticle excitations. With advances in polarization analysis capabilities at different facilities, RIXS offers exceptional potential for investigatin…
View article: Circular dichroism in resonant inelastic x-ray scattering from birefringence in CuO
Circular dichroism in resonant inelastic x-ray scattering from birefringence in CuO Open
Resonant inelastic x-ray scattering (RIXS) has become a prominent technique to study quasiparticle excitations. With advances in polarization analysis capabilities at different facilities, RIXS offers exceptional potential for investigatin…
View article: Resolving the orbital character of low-energy excitations in Mott insulator with intermediate spin-orbit coupling
Resolving the orbital character of low-energy excitations in Mott insulator with intermediate spin-orbit coupling Open
Multi-band Mott insulators with moderate spin-orbit and Hund’s coupling are key reference points for theoretical concept developments of correlated electron systems. The ruthenate Mott insulator Ca 2 RuO 4 has therefore been intensively st…
Systematic Mapping of Altermagnetic Magnons by Resonant Inelastic X-Ray Circular Dichroism Open
Altermagnets, a unique class of magnetic materials that combines features of both ferromagnets and antiferromagnets, have garnered attention for their potential in spintronics and magnonics. While the electronic properties of altermagnets …
View article: Circular Dichroism in Resonant Inelastic X-ray Scattering: Probing Altermagnetic Domains in MnTe
Circular Dichroism in Resonant Inelastic X-ray Scattering: Probing Altermagnetic Domains in MnTe Open
X-ray magnetic circular dichroism provides a means to identify ferromagnetic, chiral, and altermagnetic orders via their time-reversal-symmetry ($\mathcal{T}$) breaking. However, differentiating magnetic domains related by crystallographic…
View article: Topochemical Synthesis and Electronic Structure of High-Crystallinity Infinite-Layer Nickelates on an Orthorhombic Substrate
Topochemical Synthesis and Electronic Structure of High-Crystallinity Infinite-Layer Nickelates on an Orthorhombic Substrate Open
Superconductivity in infinite-layer nickelates has stirred much research interest, to which questions regarding the nature of superconductivity remain elusive. A critical leap forward to address these intricate questions is through the gro…
Impact of electron correlations on two-particle charge response in electron- and hole-doped cuprates Open
Estimating many-body effects that deviate from an independent particle approach has long been a key research interest in condensed matter physics. Layered cuprates are prototypical systems, where electron-electron interactions are found to…
View article: Electronic and magnetic excitations in La3Ni2O7
Electronic and magnetic excitations in La3Ni2O7 Open
High-temperature superconductivity was discovered in the pressurized nickelate La3Ni2O7 which has a unique bilayer structure and mixed valence state of nickel. The properties at ambient pressure contain crucial information of the fundament…
View article: Orbital inversion and emergent lattice dynamics in infinite layer CaCoO$_2$
Orbital inversion and emergent lattice dynamics in infinite layer CaCoO$_2$ Open
The layered cobaltate CaCoO$_2$ exhibits a unique herringbone-like structure. Serving as a potential prototype for a new class of complex lattice patterns, we study the properties of CaCoO$_2$ using X-ray absorption spectroscopy (XAS) and …
View article: Evolution from a charge-ordered insulator to a high-temperature superconductor in Bi2Sr2(Ca,Dy)Cu2O8+δ
Evolution from a charge-ordered insulator to a high-temperature superconductor in Bi2Sr2(Ca,Dy)Cu2O8+δ Open
How Cooper pairs form and condense has been the main challenge in the physics of copper-oxide high-temperature superconductors. Great efforts have been made in the 'underdoped' region of the phase diagram, through doping a Mott insulator o…
View article: Rethinking Oxygen Redox: Does Oxygen Dimerization Occur without Oxidation in Li<sub>2</sub>NiO<sub>3</sub>?
Rethinking Oxygen Redox: Does Oxygen Dimerization Occur without Oxidation in Li<sub>2</sub>NiO<sub>3</sub>? Open
In layered lithium transition metal oxide cathodes, high-voltage operation is accompanied by the formation of oxygen dimers, which are widely used as an indicator of oxygen-redox activity. However, understanding the role that oxygen dimeri…
Emergence of Interfacial Magnetism in Strongly‐Correlated Nickelate‐Titanate Superlattices Open
Strongly‐correlated transition‐metal oxides are widely known for their various exotic phenomena. This is exemplified by rare‐earth nickelates such as LaNiO 3 , which possess intimate interconnections between their electronic, spin, and lat…
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: Reversible Electron–Holes on O in P2‐type Na<sub>0.67</sub>Li<sub>0.1</sub>Ni<sub>0.3</sub>Mn<sub>0.6</sub>O<sub>2</sub>
Reversible Electron–Holes on O in P2‐type Na<sub>0.67</sub>Li<sub>0.1</sub>Ni<sub>0.3</sub>Mn<sub>0.6</sub>O<sub>2</sub> Open
Achieving reversible O‐redox through the formation of electron–holes on O could hold the key to a new generation of high energy density Na‐ion cathodes. However, to date, it has only been demonstrated in a small handful of cathode material…
View article: Unified Description of Charge Density Waves in Electron- and Hole-doped Cuprate Superconductors
Unified Description of Charge Density Waves in Electron- and Hole-doped Cuprate Superconductors Open
High-temperature cuprates superconductors are characterised by the complex interplay between superconductivity (SC) and charge density wave (CDW) in the context of intertwined competing orders. In contrast to abundant studies for hole-dope…
View article: Unified Description of Charge Density Waves in Electron- and Hole-doped Cuprate Superconductors
Unified Description of Charge Density Waves in Electron- and Hole-doped Cuprate Superconductors Open
High-temperature cuprates superconductors are characterised by the complex interplay between superconductivity (SC) and charge density wave (CDW) in the context of intertwined competing orders. In contrast to abundant studies for hole-dope…
View article: Rethinking Oxygen Redox: Does Oxygen Dimerisation Occur without Oxidation in Li2NiO3?
Rethinking Oxygen Redox: Does Oxygen Dimerisation Occur without Oxidation in Li2NiO3? Open
In layered lithium transition metal oxide cathodes, high voltage operation is accompanied by the formation of oxygen dimers, which are widely used as an indicator of oxygen-redox activity. However, understanding the role that oxygen dimeri…
View article: Metal–Ligand Redox in Layered Oxide Cathodes for Li-ion Batteries
Metal–Ligand Redox in Layered Oxide Cathodes for Li-ion Batteries Open
Understanding charge compensation in Li-ion battery cathodes is crucial for improving specific capacity and cycle life. This study clarifies some of the ambiguities and inaccuracies of the commonly used ionic-bonding model that requires se…
View article: Electronic and magnetic excitations in La3Ni2O7
Electronic and magnetic excitations in La3Ni2O7 Open
The striking discovery of high-temperature superconductivity (HTSC) of 80 K in a bilayer nickelate La3Ni2O7 under a moderately high pressure of about 14 GPa ignited a new wave of studying HTSC in nickelates. The properties of the parental …
Emergence of interfacial magnetism in strongly-correlated nickelate-titanate superlattices Open
Strongly-correlated transition-metal oxides are widely known for their various exotic phenomena. This is exemplified by rare-earth nickelates such as LaNiO$_{3}$, which possess intimate interconnections between their electronic, spin, and …