A5005742960- Magnetic and transport properties of perovskites and related materials
- Advanced Condensed Matter Physics
- Topological Materials and Phenomena
- Physics of Superconductivity and Magnetism
- High-pressure geophysics and materials
- High Entropy Alloys Studies
- Chalcogenide Semiconductor Thin Films
- Crystal Structures and Properties
- 2D Materials and Applications
- Iron-based superconductors research
- Advanced Thermoelectric Materials and Devices
- Rare-earth and actinide compounds
- Ferroelectric and Piezoelectric Materials
- earthquake and tectonic studies
- High-Temperature Coating Behaviors
- Electronic and Structural Properties of Oxides
- Nuclear materials and radiation effects
- Photorefractive and Nonlinear Optics
- Geological and Geochemical Analysis
- Chemical Thermodynamics and Molecular Structure
- Magnetic Properties of Alloys
- Cold Atom Physics and Bose-Einstein Condensates
École Polytechnique Fédérale de Lausanne
2021-2025
Johns Hopkins University
2025
Exotic quantum phases, arising from a complex interplay of charge, spin, lattice and orbital degrees freedom, are immense interest to wide research community. A well-known example such an entangled behavior is the Jahn-Teller effect, where lifting degeneracy proceeds through distortions. Here we demonstrate that highly-symmetrical 5d1 double perovskite Ba2MgReO6, comprising 3D array isolated ReO6 octahedra, represents rare dynamic system in strong spin-orbit coupling regime. Thermodynamic...
Abstract Murunskite (K 2 FeCu 3 S 4 ) bridges the two known families of high‐temperature superconductors, cuprates and iron‐pnictides, structurally electronically. Like these families, murunskite exhibits an antiferromagnetic (AF)‐like response with ordered phase below 97 K. The magnetic iron atoms are randomly distributed over one‐quarter sites in two‐dimensional planes, while remaining occupied by non‐magnetic copper, evoking notion a high‐entropy alloy. This intriguing transition is...
Clarifying the underlying mechanisms that govern ordering transitions in condensed matter systems is crucial for comprehending emergent properties and phenomena. While are often classified as electronically driven or lattice-driven, we present a departure from this conventional picture case of double perovskite Ba2MgReO6. Leveraging resonant non-resonant elastic x-ray scattering techniques, unveil simultaneous structural distortions charge quadrupoles at critical temperature Tq ~ 33 K. Using...
TlBiSSe is a 3D Dirac semimetal that exists at the interface between topological insulator, TlBiS${}_{2}$, and trivial TlBiSe${}_{2}$. It one of few systems with an ideal band structure, exhibiting only conical dispersive bands over almost half electronvolt. Here, authors find rare unequivocal signature cone in its optical magneto-optical properties, achieved by carefully controlled synthesis places Fermi level very close to point.
Clarifying the underlying mechanisms that govern ordering transitions in condensed matter systems is crucial for comprehending emergent properties and phenomena. While are often classified as electronically driven or lattice-driven, we present a departure from this conventional paradigm case of double perovskite Ba$_2$MgReO$_6$. Leveraging resonant non-resonant elastic x-ray scattering techniques, unveil simultaneous structural distortions charge quadrupoles at critical temperature...
Dark blue single crystals of Al1.753+Ti1.04+Ti0.253+O5 were grown with a novel synthesis method based on the reaction Ti3+/Ti4+-containing langbeinite melt and porous α-alumina crucible. The obtained needles crystallize in pseudobrookite structure and, upon heating, undergo two reversible phase transitions, from orthorhombic Cmcm to C2/m first subsequently C2 symmetry. Like known aluminum titanate pseudobrookites, anisotropic thermal expansion is observed. temperature evolution crystal...
Murunskite (K$_2$FeCu$_3$S$_4$) is a bridging compound between the only two known families of high-temperature superconductors. It semiconductor like parent compounds cuprates, yet isostructural to metallic iron-pnictides. Moreover, both families, it has an antiferromagnetic (AF)-like response with ordered phase occurring below $\approx$ 100 K. Through comprehensive neutron, M\"ossbauer, and XPS measurements on single crystals, we unveil AF nearly commensurate quarter-zone wave vector....
Exotic quantum phases, arising from a complex interplay of charge, spin, lattice and orbital degrees freedom, are immense interest to wide research community. A well-known example such an entangled behavior is the Jahn-Teller effect, where lifting degeneracy proceeds through distortions, often accompanied by ordering spins metal-insulator transitions. Static including cooperative behavior, have been associated with colossal magneto-resistance, multiferroicity, high-$T_\mathrm{C}$...
<title>Abstract</title> Exploring the intricate interplay between disorder and correlations in compositionally complex alloys, our study employs resonant valence band photoemission, optical conductivity, electrical resistivity, complemented by density functional theory-based linear response calculations. By applying dynamical mean-field theory, we identify correlation signatures damping spectra, emphasizing significance of many-body effects, especially states far from Fermi edge. Electronic...
TlBiSSe is a rare realization of 3D semimetal with conically dispersing band that has an optical response which well isolated from other contributions in broad range photon eneries. We report and magneto-optical spectroscopy on this material. When the compound chemically tuned into state lowest carrier concentration, we find nearly linear frequency dependence conductivity below 0.5~eV. Landau level allows us to describe system massive Dirac model, giving gap $2Δ=32$~meV in-plane velocity...