A5064017519- Advanced Condensed Matter Physics
- Magnetic and transport properties of perovskites and related materials
- Physics of Superconductivity and Magnetism
- Topological Materials and Phenomena
- 2D Materials and Applications
- Iron-based superconductors research
- Graphene research and applications
- Rare-earth and actinide compounds
- Multiferroics and related materials
- Electronic and Structural Properties of Oxides
- Magnetic properties of thin films
- Hydrocarbon exploration and reservoir analysis
- Quantum and electron transport phenomena
- Crystal Structures and Properties
- Chalcogenide Semiconductor Thin Films
- NMR spectroscopy and applications
- High-pressure geophysics and materials
- Hydraulic Fracturing and Reservoir Analysis
- Advanced Thermoelectric Materials and Devices
- Organic and Molecular Conductors Research
- Inorganic Chemistry and Materials
- Heusler alloys: electronic and magnetic properties
- MXene and MAX Phase Materials
- Corporate Taxation and Avoidance
- Magnetic Properties of Alloys
Pennsylvania State University
2003-2025
Chongqing University of Science and Technology
2025
Park University
2020-2024
Chengdu University of Technology
2024
Chongqing University of Technology
2024
China University of Petroleum, Beijing
2013-2023
Tulane University
2013-2022
Zhengzhou University
2022
Hubei University
2022
Huazhong University of Science and Technology
2019-2022
The new alpha-Fe(Te,Se) superconductors share the common iron building block and ferminology with LaFeAsO BaFe(2)As(2) families of superconductors. In contrast predicted commensurate spin-density-wave order at nesting wave vector (pi, 0), a completely different magnetic composition tunable propagation (deltapi, deltapi) was determined for parent compound Fe_{1+y}Te in this powder single-crystal neutron diffraction study. antiferromagnetic survives as short-range one even highest T_{C}...
We report our study of the evolution superconductivity and phase diagram ternary $\text{Fe}{({\text{Se}}_{1\ensuremath{-}x}{\text{Te}}_{x})}_{0.82}$ $(0\ensuremath{\le}x\ensuremath{\le}1.0)$ system. discovered a superconducting with ${T}_{c,\text{max}}=14\text{ }\text{K}$ in $0.3<x<1.0$ range. This is suppressed when sample composition approaches end member ${\text{FeTe}}_{0.82}$, which exhibits an incommensurate antiferromagnetic order. discuss relationship between magnetism this material...
A Dirac nodal-line semimetal phase, which represents a new quantum state of topological materials, has been experimentally realized only in few systems, including PbTaSe2, PtSn4, and ZrSiS. In this Letter, we report evidence fermions ZrSiSe ZrSiTe probed de Haas–van Alphen oscillations. Although share similar layered structure with ZrSiS, our studies show the Fermi surface (FS) enclosing nodal line 2D character ZrSiTe, contrast 3D-like FS Another important property revealed experiment is...
Phase-sensitive measurements were made on Sr2RuO4 to establish unambiguously the odd-parity pairing in this material. The critical current of Au(0.5)In(0.5)-Sr2RuO4 superconducting quantum interference devices prepared single crystals was found be a maximum for with junctions same side crystal and minimum opposite sides, limit zero magnetic flux; these findings indicate that phase order parameter changes by pi under inversion. This result verifies symmetry formation spin-triplet Cooper pairs Sr2RuO4.
Abstract The promise of high-density and low-energy-consumption devices motivates the search for layered structures that stabilize chiral spin textures such as topologically protected skyrmions. At same time, recently discovered long-range intrinsic magnetic orders in two-dimensional van der Waals materials provide a new platform discovery novel physics effects. Here we demonstrate Dzyaloshinskii–Moriya interaction Néel-type skyrmions are induced at WTe 2 /Fe 3 GeTe interface. Transport...
$\mathrm{MnBi_2Te_4}$ has recently been established as an intrinsic antiferromagnetic (AFM) topological insulator and predicted to be ideal platform realize quantum anomalous Hall (QAH) axion states. We performed comprehensive studies on the structure, nontrivial surface state magnetotransport properties of this material. Our results reveal effect arising from a non-collinear spin structure for magnetic field parallel $c$-axis. also observed remarkable negative magnetoresistance under...
As the only non-carbon elemental layered allotrope, few-layer black phosphorus or phosphorene has emerged as a novel two-dimensional (2D) semiconductor with both high bulk mobility and band gap. Here we report fabrication transport measurements of phosphorene-hexagonal BN (hBN) heterostructures one-dimensional edge contacts. These transistors are stable in ambient conditions for >300 h, display ambipolar behavior, gate-dependent metal–insulator transition, up to 4000 cm2 V−1 s−1. At low...
Three-dimensional (3D) topological semimetals represent a new class of matters. The study this family materials has been at the frontiers condensed matter physics, and many breakthroughs have made. Several semimetal phases, including Dirac (DSMs), Weyl (WSMs), nodal-line (NLSMs), triple-point semimetals, theoretically predicted experimentally demonstrated. low-energy excitation around Dirac/Weyl nodal points, line, or triply degenerated point can be viewed as emergent relativistic fermions....
A kind of topological material, the type-II Weyl semimetal, was proposed recently where points emerge at contact electron and hole pockets, resulting in a highly tilted cone. In semimetals, Lorentz invariance is violated different type fermion generated that leads to intriguing physical properties. WTe2 interesting because it predicted be good candidate for realizing semimetals. By utilizing laser-based angle-resolved photoemission spectroscopy with high energy momentum resolutions, we have...
Establishing the appropriate theoretical framework for unconventional superconductivity in iron-based materials requires correct understanding of both electron correlation strength and role Fermi surfaces. This fundamental issue becomes especially relevant with discovery iron chalcogenide superconductors. Here, we use angle-resolved photoemission spectroscopy to measure three representative chalcogenides, FeTe0.56Se0.44, monolayer FeSe grown on SrTiO3 K0.76Fe1.72Se2. We show that these...
Weyl semimetals (WSM) have been extensively studied due to their exotic properties such as topological surface states and anomalous transport phenomena. Their band structure topology is usually predetermined by material parameters can hardly be manipulated once the formed. unique appear at very low temperature, which sets challenges for practical device applications. In this work, we demonstrate a way modify via weak magnetic field in ferromagnetic semimetal, Co2MnAl, room temperature. We...
High-entropy oxides (HEOs), which contain five or more metal cations that are generally thought to be randomly mixed in a crystalline oxide lattice, can exhibit unique and enhanced properties, including improved catalytic performance, due synergistic effects. Here, we show band gap narrowing emerges high-entropy aluminate spinel oxide, (Fe0.2Co0.2Ni0.2Cu0.2Zn0.2)Al2O4 (A5Al2O4). The 0.9 eV of A5Al2O4 is narrower than the gaps all parent oxides. First-principles calculations for...
AgSbTe2 is a promising p-type thermoelectric material operating in the mid-temperature regime. To further enhance its performance, previous research has mainly focused on reducing lattice thermal conductivity by forming ordered nanoscale domains for instance. However, relatively low power factor main limitation affecting density of AgSbTe2-based devices. In this work, we demonstrate that hole-doped with Sn induces formation new impurity band just above valence maximum. This approach...
The electronic structure of Sr2RuO4 is investigated by high angular resolution ARPES at several incident photon energies. We address the controversial issues Fermi surface (FS) topology and van Hove singularity M point, showing that a state replica primary FS due to sqrt[2]xsqrt[2] reconstruction are responsible for previous conflicting interpretations. thus determined consistent with de Haas-van Alphen results, it provides additional information on detailed shape alpha, beta, gamma sheets.
We have investigated the effect of Fe nonstoichiometry on properties Fe1+y(Te, Se) superconductor system by means resistivity, Hall coefficient, magnetic susceptibility, and specific heat measurements. find that excess at interstitial sites (Te, layers not only suppresses superconductivity, but also results in a weakly localized electronic state. argue these effects originate from coupling between adjacent square planar sheets, which favors short-range order.
We report the specific heat of a high-quality single crystal ( T c =1.48 K) spin-triplet superconductor Sr 2 RuO 4 under magnetic fields precisely parallel to basal plane. The field-sweep measurements at low temperatures have revealed existence two distinct critical fields. will argue that dependence energy gap on different Fermi-surface sheets in combination with in-plane anisotropy can explain such behavior. Furthermore, temperature-sweep clearly an unusual entropy release somewhat below H...
We report a study of the magnetization density in mixed state unconventional superconductor Sr2RuO4. On entering superconducting we find no change magnitude or distribution induced moment for magnetic field 1 T applied within Ru O2 planes. Our results are consistent with spin-triplet Cooper pairing spins lying basal plane. This is contrast similar experiments performed on conventional and high- T(c) superconductors.
Neutron scattering is used to probe magnetic excitations in FeSe_{0.4}Te_{0.6} (T_{c} = 14 K). Low energy spin fluctuations are found with a characteristic wave vector (1/21/2L) that corresponds Fermi surface nesting and differs from Q_{m} (delta01/2) for ordering Fe_{1+y}Te. A resonance variant Planck's over 2piOmega_{0} 6.51(4) meV approximately 5.3k_{B}T_{c} 2piGamma 1.25(5) develops the superconducting state normal continuum. We show consistent bound associated s_{+/-} superconductivity...
We report the field-orientation dependent specific heat of spin-triplet superconductor Sr2RuO4 under magnetic field aligned parallel to RuO2 planes with high accuracy. Below about 0.3 K, striking fourfold oscillations density states reflecting superconducting gap structure have been resolved for first time. also obtained strong evidence multiband superconductivity and concluded that in active band, responsible instability, is modulated a minimum along [100] direction.
The quantum oscillations of the magnetoresistance under ambient and high pressure have been studied for WTe2 single crystals, in which extremely large was discovered recently. By analyzing Shubnikov-de Haas oscillations, four Fermi surfaces are identified, two them found to persist pressure. sizes these pockets comparable, but show increasing difference with At 0.3 K 14.5 T, decreases drastically from 1.25×10(5)% 7.47×10(3)% 23.6 kbar, is likely caused by relative change surfaces. These...
As a 2D ferromagnetic semiconductor with magnetic ordering, atomically thin chromium tri-iodide is the latest addition to family of two-dimensional (2D) materials. However, realistic exploration CrI3-based devices and heterostructures challenging due its extreme instability under ambient conditions. Here, we present Raman characterization CrI3 demonstrate that main degradation pathway photocatalytic substitution iodine by water. While simple encapsulation Al2O3, PMMA, hexagonal BN (hBN) only...