A5086756893- Physics of Superconductivity and Magnetism
- Advanced Condensed Matter Physics
- Magnetic and transport properties of perovskites and related materials
- Superconductivity in MgB2 and Alloys
- Magnetic Properties and Synthesis of Ferrites
- Iron oxide chemistry and applications
- Geomagnetism and Paleomagnetism Studies
- High-pressure geophysics and materials
- Superconducting Materials and Applications
- Multiferroics and related materials
- Theoretical and Computational Physics
- Magnetic Properties of Alloys
- Rare-earth and actinide compounds
- Magnetic properties of thin films
- 2D Materials and Applications
- Electronic and Structural Properties of Oxides
- X-ray Diffraction in Crystallography
- Characterization and Applications of Magnetic Nanoparticles
- Magnetic and Electromagnetic Effects
- Iron-based superconductors research
- Graphene research and applications
- Organic and Molecular Conductors Research
- Solid-state spectroscopy and crystallography
- MXene and MAX Phase Materials
- Topological Materials and Phenomena
AGH University of Krakow
2016-2025
Jagiellonian University
2023-2025
TU Wien
2018-2023
University of Minnesota
2013-2021
Université Toulouse III - Paul Sabatier
2016-2021
Laboratoire National des Champs Magnétiques Intenses
2016-2021
Centre National de la Recherche Scientifique
2016-2021
Université Grenoble Alpes
2016-2021
Raman scattering and photoluminescence spectroscopy are used to investigate the optical properties of single layer black phosphorus obtained by mechanical exfoliation bulk crystals under an argon atmosphere. The spectroscopy, performed in situ on same flake as measurements, demonstrates character investigated samples. emission spectra, dominated excitonic effects, display expected in-plane anisotropy. energy depends type substrate which is placed due different dielectric screening. Finally,...
We report in-plane resistivity ($\rho$) and transverse magnetoresistance (MR) measurements in underdoped HgBa$_2$CuO$_{4+\delta}$ (Hg1201). Contrary to the longstanding view that Kohler's rule is strongly violated cuprates, we find it fact satisfied pseudogap phase of Hg1201. The MR shows a quadratic field dependence, $\delta\rho/\rho_o=a H^{2}$, with $a(T)\propto T^{-4}$. In combination observed $\rho\propto T^2$ this consistent single Fermi-liquid quasiparticle scattering rate. show...
We present a detailed synchrotron x-ray scattering study of the charge-density-wave (CDW) order in simple tetragonal ${\mathrm{HgBa}}_{2}{\mathrm{CuO}}_{4+\ensuremath{\delta}}$ (Hg1201). Resonant soft measurements reveal that short-range appears at temperature is distinctly lower than pseudogap and excellent agreement with prior transient reflectivity result. Despite considerable structural differences between Hg1201 ${\mathrm{YBa}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{6+\ensuremath{\delta}}$,...
The exciton dynamics in monolayer black phosphorus is investigated over a very wide range of photoexcited densities using time resolved photoluminescence. At low excitation densities, the successfully described terms double exponential decay. With increasing population, fast, nonexponential component develops as exciton-exciton annihilation takes dominant recombination mechanism under high conditions. Our results identify an upper limit for injection density, after which reduces quantum...
The microscopic nature of an insulating state in the vicinity a superconducting state, presence disorder, is hotly debated question. While simplest scenario proposes that Coulomb interactions destroy Cooper pairs at transition, leading to localization single electrons, alternate possibility supported by experimental observations suggests instead directly localize. question homogeneity, granularity, or possibly glassiness material on verge this transition intimately related fundamental issue....
Charge order has now been observed in several cuprate high-temperature superconductors. We report a resonant inelastic x-ray scattering experiment on the electron-doped ${\mathrm{Nd}}_{2\ensuremath{-}x}{\mathrm{Ce}}_{x}\mathrm{Cu}{\mathrm{O}}_{4}$ that demonstrates existence of dynamic correlations at charge-order wave vector. Upon cooling we observe softening electronic response, which predicted to occur for $d$-wave charge cuprates. At low temperatures, energy range these excitations...
Much recent attention has focused on the voltage-driven reversible topotactic transformation between ferromagnetic metallic perovskite (P) SrCoO3-δ and oxygen-vacancy-ordered antiferromagnetic insulating brownmillerite (BM) SrCoO2.5. This is emerging as a paradigmatic example of power electrochemical gating (using, e.g., ionic liquids/gels), wide modulation electronic, magnetic, optical properties generating clear application potential. SrCoO3 films are challenging with respect to stability,...
A thorough study of ${\mathrm{EuZn}}_{2}{\mathrm{P}}_{2}$ single crystals, which were grown from Sn flux, was performed using both bulk (heat capacity, ac susceptibility, dc magnetization, electrical resistivitivity, magnetoresistance) and microscopic (M\"ossbauer spectroscopy) techniques. Electrical resistance magnetic susceptibility measured also under high pressure conditions (up to 19 9.5 GPa, respectively). Further insight into electronic properties phonons is provided by ab initio...
Superconductivity in cuprates peaks the doping regime between a metal at high p and an insulator low p. Understanding how material evolves from to is fundamental open question. Early studies magnetic fields revealed that below some critical insulator-like upturn appears resistivity of temperature, but its origin has remained puzzle. Here we propose this 'metal-to-insulator crossover' due drop carrier density n associated with onset pseudogap phase p*. We use high-field measurements on LSCO...
Large unsaturated magnetoresistance has been reported in numerous Weyl and Dirac semimetals. This raised the question of a possible link between nontrivial band topology large magnetoresistance. The authors find that elemental antimony exceeds what seen all other semimetals remains up to 60 T. amplitude its variation with field orientation can be described by modified semiclassical framework, which employed any semimetal.
Sophisticated x-ray scattering experiments reveal charge dynamics in a model cuprate compound, providing crucial insight into the connection between high-temperature superconductivity and other electronic behaviors these materials.
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...
Systematic analysis of the planar resistivity, Hall effect, and cotangent angle for electron-doped cuprates reveals underlying Fermi-liquid behavior even deep in antiferromagnetic part phase diagram. The transport scattering rate exhibits a quadratic temperature dependence, is nearly independent doping compound carrier type (electrons versus holes), hence universal. Our moreover indicates that material-specific resistivity upturn at low temperatures has same origin both electron- hole-doped cuprates.
Abstract The phase diagram of the cuprate superconductors continues to pose formidable scientific challenges. While these materials are typically viewed as doped Mott insulators, it is well known that they Fermi liquids at high hole-dopant concentrations. It was recently demonstrated moderate doping, in pseudogap (PG) region diagram, charge carriers also best described a liquid. Nevertheless, relationship between two Fermi-liquid (FL) regions and nature strange-metal (SM) state intermediate...
Seeking to unravel the enigmatic Verwey transition and its interplay with magnetism, we have conducted comprehensive measurements on temperature-dependent electrical resistivity magnetic moment of stoichiometric doped-magnetite single crystals at temperatures reaching 1000 K. These investigations allowed us identify Curie temperature, $T_C$, other characteristic resistivity. Remarkably, identified correlations between these $T_V$, indicating that transport properties mechanism are closely...
We study Shubnikov--de Haas oscillations in single crystals of TaAs and find a previously undetected two-dimensional quantum oscillation that does not belong to the bulk Fermi surface. cannot an impurity phase consistent with our observations, extensive diffraction measurements have shown presence known phases. conjecture frequency originates from surface states are sensitive disorder. One candidate is interference coherent quasiparticles traversing two distinct arcs on [001]...
${\mathrm{Co}}_{1/3}{\mathrm{NbS}}_{2}$ is the magnetic intercalate of 2H-${\mathrm{NbS}}_{2}$ where electronic itinerant and properties strongly influence each other throughout phase diagram. Here we report angle-resolved photoelectron spectroscopy (ARPES) study in ${\mathrm{Co}}_{1/3}{\mathrm{NbS}}_{2}$. In agreement with previous reports, observed structure seemingly resembles one parent material 2H-${\mathrm{NbS}}_{2}$, shift Fermi energy 0.5 eV accounting for charge transfer...