A5019151131- Advanced Condensed Matter Physics
- Physics of Superconductivity and Magnetism
- Rare-earth and actinide compounds
- Magnetic and transport properties of perovskites and related materials
- Iron-based superconductors research
- Magnetic Properties of Alloys
- High-pressure geophysics and materials
- Multiferroics and related materials
- Inorganic Chemistry and Materials
- Electronic and Structural Properties of Oxides
- Solid-state spectroscopy and crystallography
- Atomic and Subatomic Physics Research
- Industrial Engineering and Technologies
- Theoretical and Computational Physics
- Magnetic properties of thin films
- Advanced NMR Techniques and Applications
- Copper-based nanomaterials and applications
- Quantum, superfluid, helium dynamics
- Heusler alloys: electronic and magnetic properties
- Engineering Technology and Methodologies
- Hydraulic and Pneumatic Systems
- Elasticity and Material Modeling
- Electrocatalysts for Energy Conversion
- Control Systems in Engineering
- Nuclear Materials and Properties
Max Planck Institute for Chemical Physics of Solids
2016-2024
Lawrence Berkeley National Laboratory
2023
University of St Andrews
2023
University of California, Berkeley
2023
University of Cambridge
2023
National Institute for Materials Science
2023
Voronezh State Medical Academy named after N.N. Burdenko
2023
Ningbo Institute of Industrial Technology
2022
Chinese Academy of Sciences
2022
St Petersburg University
2022
Abstract Weyl semimetals (WSMs) are topological quantum states wherein the electronic bands disperse linearly around pairs of nodes with fixed chirality, points. In WSMs, nonorthogonal electric and magnetic fields induce an exotic phenomenon known as chiral anomaly, resulting in unconventional negative longitudinal magnetoresistance, chiral-magnetic effect. However, it remains open question to which extent this effect survives when chirality is not well-defined. Here, we establish detailed...
Significance <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msub> <mml:mrow> <mml:mtext>Sr</mml:mtext> </mml:mrow> <mml:mn>2</mml:mn> </mml:msub> <mml:mtext>RuO</mml:mtext> <mml:mn>4</mml:mn> </mml:math> is distinctive among unconventional superconductors, in that addition to exhibiting evidence for strong correlations, it stoichiometric and extremely clean. As a result, its electronic structure unusually well characterized, rendering an ideal platform...
Significance Research on the unconventional superconductivity of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msub> <mml:mrow> <mml:mi mathvariant="normal">S</mml:mi> mathvariant="normal">r</mml:mi> </mml:mrow> <mml:mn>2</mml:mn> </mml:msub> mathvariant="normal">R</mml:mi> mathvariant="normal">u</mml:mi> mathvariant="normal">O</mml:mi> <mml:mn>4</mml:mn> </mml:math> is undergoing a renaissance since recent spin susceptibility measurements ruling out...
Despite the fruitful achievements in development of hydrogen production catalysts with record-breaking performances, there is still a lack durable that could work under large current densities (>1000 mA cm-2). Here, we investigated catalytic behaviors Sr2RuO4 bulk single crystals. This crystal has demonstrated remarkable activities density 1000 cm-2, which require overpotentials 182 and 278 mV 0.5 M H2SO4 1 KOH electrolytes, respectively. These materials are stable for 56 days continuous...
One of the main developments in unconventional superconductivity past two decades has been discovery that most superconductors form phase diagrams also contain other strongly correlated states. Many systems interest are therefore close to more than one instability, and tuning between resultant ordered phases is subject intense research
New TbFeAs(O,F) and DyFeAs(O,F) superconductors with critical temperatures Tc = 46 45 K very high fields, ≥100 T, have been prepared at 1100–1150 °C 10–12 GPa, demonstrating that pressure may be used to synthesise late rare earth derivatives of the recently reported RFeAs(O,F) (R La–Nd, Sm, Gd) temperature superconductors.
The gap structure of Sr$_2$RuO$_4$, which is a longstanding candidate for chiral p-wave superconductor, has been investigated from the perspective dependence its specific heat on magnetic field angles at temperatures as low 0.06 K ($\sim 0.04T_{\rm c}$). Except near $H_{\rm c2}$, fourfold specific-heat oscillation under an in-plane rotating unlikely to change sign down lowest temperature K. This feature qualitatively different nodal quasiparticle excitations quasi-two-dimensional...
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Piezoelectric-based uniaxial pressure devices have become an important tool for investigating correlated electron systems. In Sr${}_{2}$RuO${}_{4}$, a Van Hove singularity can be tuned to the Fermi level, which more than doubles superconducting critical temperature. With new style of device, authors measured here stress at this occurs with high accuracy, and result now gives unmistakable discrepancy predictions from noninteracting electronic structure calculations. knowledge, they put...
Applying in-plane uniaxial pressure to strongly correlated low-dimensional systems has been shown tune the electronic structure dramatically. For example, unconventional superconductor Sr2RuO4 can be tuned through a single Van Hove point, resulting in strong enhancement of both Tc and Hc2. Out-of-plane (c axis) is expected quasi-two-dimensional even more strongly, by pushing it towards two points simultaneously. Here, we achieve record stress 3.2 GPa along c axis Sr2RuO4. Hc2 increases, as...
By determining the superconducting lower and upper critical fields <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mrow><a:msub><a:mi>H</a:mi><a:mrow><a:mi mathvariant="normal">c</a:mi><a:mn>1</a:mn></a:mrow></a:msub><a:mrow><a:mo>(</a:mo><a:mi>T</a:mi><a:mo>)</a:mo></a:mrow></a:mrow></a:math> <c:math xmlns:c="http://www.w3.org/1998/Math/MathML"><c:mrow><c:msub><c:mi>H</c:mi><c:mrow><c:mi...
We construct a phase diagram of the parent compound Fe1+xTe as function interstitial iron x in terms electronic, structural, and magnetic properties. For concentration < 10%, undergoes "semimetal" to metal transition at approximately 70 K that is also first-order coincident with structural from tetragonal monoclinic unit cell. ~ 14%, second-order 58 corresponding along orthorhombic distortion. At critical 11%, two transitions: higher temperature one an incommensurate ordering...
High-quality single crystals are essentially needed for the investigation of novel bulk properties unconventional superconductors. The availability such grown by floating-zone method has helped to unveil superconductivity layered perovskite Sr2RuO4, which is considered as a strong candidate topological spin-triplet superconductor. Yet, recent progress investigations urges further efforts obtain ultimately high-quality crystalline samples. In this paper, we focus on preparation feed rods...
We report the evolution of electronic structure at surface layered perovskite Sr_{2}RuO_{4} under large in-plane uniaxial compression, leading to anisotropic B_{1g} strains ϵ_{xx}-ϵ_{yy}=-0.9±0.1%. From angle-resolved photoemission, we show how this drives a sequence Lifshitz transitions, reshaping low-energy and rich spectrum van Hove singularities that layer hosts. comparison tight-binding modeling, find strain is accommodated predominantly by bond-length changes rather than modifications...
We report neutron scattering measurements of critical magnetic excitations in the weakly ferromagnetic superconductor UCoGe. The strong non-Landau damping we observe, although unusual has been found another related ferromagnet, UGe2 at zero pressure. However, also find there is a significant anisotropy correlation length UCoGe that contrasts with an almost isotropic for UGe2. values and are to be compatible superconductivity on small Fermi surface pockets. may important explain why pressure...
We report that the lowest energy transverse-optic phonon in metallic SnTe softens to near zero at structural transition ${T}_{C}=75\phantom{\rule{4.pt}{0ex}}\text{K}$ and importantly show of this mode below ${T}_{C}$ increases as temperature decreases. Since is a polar displacement proves unambiguously undergoes ferroelectric ${T}_{C}$. Concentration gradients imperfect stoichiometry large crystals may explain why was not seen previous inelastic neutron scattering studies. Despite being we...
Abstract Pressure represents a clean tuning parameter for traversing the complex phase diagrams of interacting electron systems, and as such has proved key importance in study quantum materials. Application controlled uniaxial pressure recently been shown to more than double transition temperature unconventional superconductor Sr 2 RuO 4 , leading pronounced peak T c versus strain whose origin is still under active debate. Here we develop simple compact method passively apply large pressures...
Polar distortions in solids give rise to the well-known functionality of switchable macroscopic polarisation ferroelectrics and, when combined with strong spin-orbit coupling, can mediate giant spin splittings electronic states. While typically found insulators, ferroelectric-like remain robust against increasing itineracy, giving so-called "polar metals". Here, we investigate temperature-dependent structure Ca$_3$Ru$_2$O$_7$, a correlated oxide metal which octahedral tilts and rotations...
The interplay of electronic and structural degrees freedom in solids is a topic intense research. More than 60 years ago, Lifshitz discussed counterintuitive possibility: lattice softening driven by conduction electrons at topological Fermi surface transitions. effect that he predicted, however, was small has not been convincingly observed. Using piezo-based uniaxial pressure cell to tune the ultraclean metal strontium ruthenate while measuring stress-strain relationship, we reveal huge...