A5074785641- Iron-based superconductors research
- 2D Materials and Applications
- Rare-earth and actinide compounds
- Advanced Condensed Matter Physics
- Topological Materials and Phenomena
- Multiferroics and related materials
- High-pressure geophysics and materials
- Magnetic and transport properties of perovskites and related materials
- Crystallization and Solubility Studies
- Inorganic Chemistry and Materials
- Corporate Taxation and Avoidance
- Crystal Structures and Properties
- X-ray Diffraction in Crystallography
- Electronic and Structural Properties of Oxides
- Graphene research and applications
- Physics of Superconductivity and Magnetism
- Ferroelectric and Piezoelectric Materials
- Polyoxometalates: Synthesis and Applications
- Transition Metal Oxide Nanomaterials
- Advanced Chemical Physics Studies
- Superconducting Materials and Applications
- MXene and MAX Phase Materials
- Geomagnetism and Paleomagnetism Studies
- Iron oxide chemistry and applications
- Metallurgical and Alloy Processes
Paul Scherrer Institute
2022-2024
A.V. Shubnikov Institute of Crystallography
2010-2021
Russian Academy of Sciences
2010-2021
Max Planck Institute for Chemical Physics of Solids
2014-2020
Federal Scientific Research Centre Crystallography and Photonics
2016-2020
Max Planck Society
2014-2016
Max Planck Institute for Chemistry
2011
Kurchatov Institute
2006-2007
Abstract Transition metal dichalcogenides have attracted research interest over the last few decades due to their interesting structural chemistry, unusual electronic properties, rich intercalation chemistry and wide spectrum of potential applications. Despite fact that majority related focuses on semiconducting transition-metal (for example, MoS 2 ), recently discovered unexpected properties WTe are provoking strong in semimetallic transition featuring large magnetoresistance,...
The family of transition-metal dichalcogenides provides a rich platform for studying the interplay between crystal structure and electronic properties in strongly correlated electron systems. Applying external pressure as tuning parameter, authors observed striking correlation critical temperature ${T}_{c}$ superconductivity strength Se-Se bonds high-pressure pyrite phase PdSe${}_{2}$. bond length Se${}_{2}$ dimer was identified main parameter controlling structure. Strong pressure-induced...
The discovery of superconductivity in hafnium pentatelluride $\mathrm{HfT}{\mathrm{e}}_{5}$ under high pressure is reported. Two structural phase transitions and metallization with developing at around 5 GPa are observed. A maximal critical temperature 4.8 K attained a 20 GPa, persists up to the maximum study (42 GPa). combination electrical transport crystal structure measurements as well theoretical electronic calculations enables construction diagram pressure.
A pressure-induced topological quantum phase transition has been theoretically predicted for the semiconductor BiTeI with giant Rashba spin splitting. In this work, evolution of electrical transport properties in and BiTeBr is investigated under high pressure. The pressure-dependent resistivity a wide temperature range passes through minimum at around 3 GPa, indicating BiTeI. Superconductivity observed both while higher temperatures still exhibits semiconducting behavior. Theoretical...
Abstract Superconductivity and topological quantum states are two frontier fields of research in modern condensed matter physics. The realization superconductivity materials is highly desired; however, such typically limited to two-dimensional or three-dimensional far from being thoroughly investigated. In this work, we boost the electronic properties quasi-one-dimensional insulator bismuth iodide β-Bi 4 I by applying high pressure. observed for pressures, where temperature dependence...
The occurrence of the long-range magnetic order high-spin Fe${}^{3+}$ ions is found in iron-containing langasite family crystals ${A}_{3}M$Fe${}_{3}$${X}_{2}$O${}_{14}$ ($A$ = Ba, Sr; $M$ Sb, Nb, Ta; $X$ Si, Ge) at $T$ \ensuremath{\le} 40 K. Neel temperature (${T}_{\mathrm{N}}$) values (27.1--37.1 K) depend on composition and significantly increase with strengthening covalence Fe-O bonds 3$f$ tetrahedra. Splitting iron positions into two sublattices established...
Unusual physical properties like large magnetoresistance (MR) and superconductivity occurring in semimetals with Dirac or Weyl points are often linked to their topologically nontrivial band structures. However, there is an increasing number of reports on that show MR the absence points. Herein we report experimental theoretical study layered transition-metal dichalcogenide (TMDC) $\mathrm{HfT}{\mathrm{e}}_{2}$ shows a $1350%$ at $T=2$ K...
The pressure effect on crystal structures, lattice vibrations, and electrical transport properties of $\mathrm{Pd}{\mathrm{S}}_{2}$ $\mathrm{NiS}{\mathrm{e}}_{2}$ were studied under high pressures up to \ensuremath{\sim}50 GPa using Raman spectroscopy resistivity measurements. undergoes semiconductor-to-metal transition at a \ensuremath{\sim}7 without structural phase transition. Structural the pyrite-type occurs \ensuremath{\sim}16 GPa. Superconductivity emerges in with well-defined...
Ferropericlase [(Mg,Fe)O] is one of the most abundant minerals earth’s lower mantle. The high-spin (HS) to low-spin (LS) transition in Fe 2+ ions may dramatically alter physical and chemical properties (Mg,Fe)O deep To understand effects compression on ground electronic state iron, magnetic states (Mg 0.75 0.25 )O have been investigated using transmission synchrotron Mössbauer spectroscopy at high pressures low temperatures (down 5 K). Our results show that critical pressure P c spin close T...
Functional oxides whose physicochemical properties may be reversibly changed at standard conditions are potential candidates for the use in next-generation nanoelectronic devices. To date, vanadium dioxide (VO2 ) is only known simple transition-metal oxide that demonstrates a near-room-temperature metal-insulator transition used such appliances. In this work, we synthesized and investigated crystals of novel mixed-valent iron with an unconventional Fe5 O6 stoichiometry. Near 275 K, undergoes...
The long-range 3D magnetic ordering in the Fe3+-containing langasite family compound Ba3TaFe3Si2O14 was observed below 27 K with iron lattice split into two nonequivalent sublattices. appearance of Fe sites is associated structural phase transition P321→P3 induced by ordering. At this transition, presence polar threefold axis creates conditions for ferroelectric state and may be considered as a magnetically multiferroic. Fe3+ moments sublattices are oriented at different angles to local...
The structural and electronic properties of $\mathrm{BaC}{\mathrm{r}}_{2}\mathrm{A}{\mathrm{s}}_{2}$, which is isostructural to the 122 iron arsenide superconductors, are studied at high pressures using synchrotron x-ray powder diffraction, electrical resistivity measurements, first-principles calculations. At a pressure about 18.5 GPa, an phase transition collapsed tetragonal observed, similar that in $\mathrm{BaF}{\mathrm{e}}_{2}\mathrm{A}{\mathrm{s}}_{2}$. In both phases,...
The evolution of the crystal structure and electrical transport properties distorted layered transition metal dichalcogenide ReSe2 was studied under high pressure up to ~90 GPa by Raman spectroscopy resistivity measurements accompanied ab initio electronic band calculations. studies indicate an isostructural phase due layer sliding at ~7 GPa, 1T-phase which remains stable highest pressures employed in these experiments. From a direct gap semiconductor ambient pressure, undergoes...
Non-trivial electronic properties of silver telluride and other chalcogenides, such as the presence a topological insulator state, transitions, metallization, possible emergence superconductivity under pressure have attracted attention in recent years. In this work, we studied selenide (Ag2Se). We performed direct current electrical resistivity measurements, situ Raman spectroscopy, synchrotron x-ray diffraction accompanied by ab initio calculations to explore pressure-induced changes atomic...
Transition-metal dichalcogenides (TMDCs) stand out with their high chemical stability and the possibility to incorporate a wide range of atoms molecules between layers. The behavior conduction electrons in such $3d$-metal-inserted materials is closely related magnetic properties can be sensitively controlled by external fields. Here, we study magnetotransport Mn-inserted $\mathrm{Nb}{\mathrm{S}}_{2}, {\mathrm{Mn}}_{1/4}\mathrm{Nb}{\mathrm{S}}_{2}$, demonstrating complex magnetoresistance...
In orthoferrites the rare-earth (<a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mrow><a:mi>R</a:mi></a:mrow></a:math>) ion has a big impact on structural and magnetic properties; in particular, ionic size influences octahedral tilt <b:math xmlns:b="http://www.w3.org/1998/Math/MathML"><b:mrow><b:msup><b:mrow><b:mi>R</b:mi></b:mrow><b:mrow><b:mn>3</b:mn><b:mo>+</b:mo></b:mrow></b:msup><b:mtext>−</b:mtext><b:mi mathvariant="normal">F</b:mi><b:msup><b:mrow><b:mi...
The pressure dependence of the magnetism double perovskite ${\mathrm{Sr}}_{2}{\mathrm{FeOsO}}_{6}$ was investigated by temperature- and magnetic-field-dependent synchrotron $^{57}\mathrm{Fe}$ M\"ossbauer spectroscopy in energy domain up to $\ensuremath{\sim}50$ GPa. is known feature antiferromagnetic ordering below ${T}_{\mathrm{N}}\ensuremath{\sim}140$ K a change spin structure from AF1 AF2 near 70 at ambient pressure. Previous Os ${L}_{2,3}$ x-ray magnetic circular dichroism (XMCD) spectra...
Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation S. A. Medvedev, O. I. Barkalov, P. Naumov, T. Palasyuk, J. Evers, M. Klapötke, C. Felser; Phase transitions of cesium azide at pressures up to 30 GPa studied using in situ Raman spectroscopy. Journal Applied Physics 28 April 2015; 117 (16): 165901. https://doi.org/10.1063/1.4918911 Download citation file: Ris...
High pressure Raman, resistivity and synchrotron x-ray diffraction studies on Weyl semimetals NbAs TaAs have been carried out along with density functional theoretical (DFT) analysis to explain induced structural electronic topological phase transitions. The frequencies of first order Raman modes harden increasing pressure, exhibiting a slope change at [Formula: see text] GPa for TaAs. resistivities exhibit minimum pressures close these transition also in the bulk modulus is observed. Our...
The structural properties and electrical resistivity of homogeneous mixed-valent EuNi2P2 are studied at pressures up to 45 GPa. No phase transition is observed in the whole pressure range overall behavior parameters similar that related compounds collapsed tetragonal ThCr2Si2-type structure. Electrical measured 31 GPa temperatures between 4 300 K exhibits continuous changes from typical for a Eu system normal metallic above 20 GPa, indicating strongly atoms with valence ~2.5 towards pure...
We report the effect of hydrostatic pressure on magnetic and structural properties shape-memory Heusler alloy Ni50Mn35In15. Magnetization x-ray diffraction experiments were performed at pressures up to 5 GPa using diamond anvil cells. Pressure stabilizes martensitic phase, shifting transition higher temperatures suppresses ferromagnetic austenitic phase. Above ~3 GPa, where martensitic-transition temperature approaches Curie in austenite, magnetization shows no indication ordering anymore....