A5074950280- Iron-based superconductors research
- Physics of Superconductivity and Magnetism
- Rare-earth and actinide compounds
- Magnetic and transport properties of perovskites and related materials
- Superconductivity in MgB2 and Alloys
- Advanced Condensed Matter Physics
- Magnetic Properties of Alloys
- Magnetic confinement fusion research
- Topological Materials and Phenomena
- Welding Techniques and Residual Stresses
- Intellectual Capital and Performance Analysis
- Corporate Taxation and Avoidance
- 2D Materials and Applications
- Ionosphere and magnetosphere dynamics
- Graphene research and applications
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Quantum and electron transport phenomena
- Advanced Welding Techniques Analysis
- Microstructure and Mechanical Properties of Steels
- Aluminum Alloys Composites Properties
- Superconducting Materials and Applications
- Semiconductor materials and devices
- High-pressure geophysics and materials
- Plasmonic and Surface Plasmon Research
Center for High Pressure Science and Technology Advanced Research
2016-2024
Yanshan University
2019-2023
University of Houston
2023
Center for High Pressure Science & Technology Advanced Research
2018-2021
Institute of Physics
2000-2019
Chinese Academy of Sciences
2003-2019
Argonne National Laboratory
2019
Carnegie Institution for Science
2019
Geophysical Laboratory
2019
Stanford University
2019
We present a systematic study of both the temperature and frequency dependence optical response in TaAs, material that has recently been realized to host Weyl semimetal state. Our reveals conductivity TaAs features narrow Drude alongside conspicuous linear on frequency. The width peak decreases upon cooling, following $T^{2}$ which is expected for semimetals. Two components with distinct slopes dominate 5-K conductivity. A comparison between our experimental results theoretical calculations...
Strong coupling between discrete phonon and continuous electron-hole pair excitations can give rise to a pronounced asymmetry in the line shape, known as Fano resonance. This effect has been observed variety of systems, such stripe-phase nickelates, graphene high-$T_{c}$ superconductors. Here, we reveal explicit evidence for strong an infrared-active $A_1$ electronic transitions near Weyl points (Weyl fermions) through observation resonance recently discovered semimetal TaAs. The resultant...
Multicomponent alloying has displayed extraordinary potential for producing exceptional structural and functional materials. However, the synthesis of single-phase, multi-principal covalent compounds remains a challenge. Here, we present diffusion-controlled strategy realization transition metal carbides (MPTMCs) with single face-centered cubic phase. The increased interfacial diffusion promoted by addition nonstoichiometric compound leads to rapid formation phase at much lower sintering...
We have studied the half-Heusler compound TbPdBi through resistivity, magnetization, Hall effect and heat capacity measurements. A semimetal behavior is observed in its normal state transport properties, which characterized by a large negative magnetoresistance below 100 K. Notably, we find coexistence of superconductivity antiferromagnetism this compound. The superconducting transition appears at 1.7 K, while antiferromagnetic phase takes place 5.5 upper critical field $H_{c2}$ shows an...
The optical properties of ${\mathrm{Ba}}_{0.6}{\mathrm{K}}_{0.4}{\mathrm{Fe}}_{2}{\mathrm{As}}_{2}$ have been determined in the normal state for a number temperatures over wide frequency range. Two Drude terms, representing two groups carriers with different scattering rates ($1/\ensuremath{\tau}$), well describe real part conductivity ${\ensuremath{\sigma}}_{1}(\ensuremath{\omega})$. A ``broad'' component results an incoherent background $T$-independent $1/{\ensuremath{\tau}}_{b}$, while...
Abstract The discovery of electrides, in particular, inorganic electrides where electrons substitute anions, has inspired striking interests the systems that exhibit unusual electronic and catalytic properties. So far, however, experimental studies such are largely restricted to ambient conditions, unable understand their interactions between electron localizations geometrical modifications under external stimuli, e.g., pressure. Here, pressure‐induced structural evolutions Ca 2 N by situ...
In this study, steel–Al laminates are prepared via hot-roll bonding and annealed for various durations to generate intermetallic compounds (IMCs) with different distributions at the interface. The fracture forms of IMCs analyzed in-situ tensile–shear experiments, shear stress distribution in regions adjacent interface during process is investigated finite element modeling using Abaqus. Results show that granular can change direction cracks limit crack expansion process. location maximum...
Resistivity, magnetization and microscopic $^{75}$As nuclear magnetic resonance (NMR) measurements in the antiferromagnetically ordered state of iron-based superconductor parent material CaFe$_2$As$_2$ exhibit anomalous features that are consistent with collective freezing domain walls. Below $T^*\approx 10$ K, resistivity exhibits a peak downturn, bulk sharp increase, NMR reveal presence slow fluctuations hyperfine field. These both charge spin response strongly field dependent, fully...
Temperature- or pressure-driven n–p conduction-type switching has been described as an emerging phenomenon for potential applications transistors, switches, and memory devices. The key challenge in the development of such materials is to establish maneuverable controllable methods achieve easy convertibility nonvolatility. Herein, we report first example rewritable pressure temperature dual-controlled marcasite-type CrSb2. At room temperature, CrSb2 exhibits unexcepted conductivity-type...
A series of LiFe$_{1-x}$Co$_{x}$As compounds with different Co concentrations have been studied by transport, optical spectroscopy, angle-resolved photoemission spectroscopy and nuclear magnetic resonance. We observed a Fermi liquid to non-Fermi (FL-NFL-FL) crossover alongside monotonic suppression the superconductivity increasing content. In parallel FL-NFL-FL crossover, we found that both low-energy spin fluctuations surface nesting are enhanced then diminished, strongly suggesting NFL...
Abstract The aluminum (Al)/steel transition joints used in ships are processed from composite plates, and their mechanical properties have a significant impact on the safety of ships. In this paper, Al/steel plate was prepared using rolling, with 5083 as cladding plate, Q235 steel substrate, TA1 titanium (Ti) DT4 pure iron (Fe) intermediate layers. heterothermic billet through induction heating by magnetic effects Fe then obtained rolling. impacts post-rolling cooling process microstructure...
We show results on the vortex core dissipation through current-voltage measurements under applied pressure and magnetic field in superconducting phase of CeCoIn$_5$. find that as soon system becomes superconducting, resistivity increases sharply temperature decrease. The sharp increase flux flow is due to quasiparticle scattering critical antiferromagnetic fluctuations. strength fluctuations below transition suggests magnetism complimentary superconductivity therefore must be considered...
The magnetic properties of CaCo$_{2}$As$_{2}$ single crystal was systematically studied by using dc magnetization and torque measurements. A paramagnetic to antiferromagnetic transition occurs at $T_N$ = 74 K with Co spins being aligned parallel the c axis. For $H \parallel c$, a field-induced spin-flop observed below from inferred detailed analysis torque. Finally, we summarize phase diagram based on our results in \emph{H-T} plane.
The half-Heusler compounds YPdBi and TbPdBi, while having a similar band structure, exhibit different magnetic properties. is diamagnet, TbPdBi shows antiferromagnetic order below 5.5 K. Both are superconductors with ${T}_{c}\ensuremath{\approx}1$ K for ${T}_{c}\ensuremath{\approx}1.75$ TbPdBi. Such contrast in properties between these two opens question about the effects of structure or correlations on superconductivity. Using combination tunnel diode oscillator commercial dilution...
Anisotropy is the key to understanding iron-based superconductors, which usually have quasi-two-dimensional layered structures. By using torque measurements (a sensitive tool detect magnetic anisotropy), we investigate superconducting anisotropy of ${\mathrm{KCa}}_{2}{\mathrm{Fe}}_{4}{\mathrm{As}}_{4}{\mathrm{F}}_{2}$ (12442, ${T}_{c}=33\phantom{\rule{4.pt}{0ex}}\text{K}$) single crystal. In normal state, data display a paramagnetic behavior ${H}^{2}sin2\ensuremath{\theta}$ in different...
Two magnetic-field-induced quantum critical behaviors were recently discovered in two dimensional electron gas (2DEG) at LaTiO3/SrTiO3 interface and interpreted by disordered superconducting puddles coupled through 2DEG. In this scenario, the 2DEG is proposed to undergo a spontaneous phase separation breaks up into locally metallic matrix. However, as inhomogeneous only illative, proposal still lacks direct experimental demonstration. Here, we artificially construct puddles-2DEG hybrid...
The strongly correlated electron fluids in high temperature cuprate superconductors demonstrate an anomalous linear (T) dependent resistivity behavior, which persists to a wide range without exhibiting saturation. As cooling down, those lose the and condense into superfluid. However, origin of linear-T behavior its relationship superconductivity remain mystery. Here we report universal relation [Formula: see text], bridges slope linear-T-dependent (dρ/dT) London penetration depth λ L at zero...
The effect of K, Co, and P dopings on the lattice dynamics in ${{\mathrm{BaFe}}_{2}\mathrm{As}}_{2}$ system is studied by infrared spectroscopy. We focus phonon at $\ensuremath{\sim}253\phantom{\rule{0.28em}{0ex}}{\mathrm{cm}}^{\ensuremath{-}1}$, highest energy in-plane infrared-active Fe-As mode ${{\mathrm{BaFe}}_{2}\mathrm{As}}_{2}$. Our studies show that Co lead to a blueshift this frequency, which can be simply interpreted change parameters induced doping. In sharp contrast, an unusual...
Abstract Disorder‐induced Griffiths singularity of quantum phase transition (QPT) is a crucial issue in 2D superconductors (2DSC). In superconducting system, the strength disorder found to be associated with vortex pinning energy, which closely related singularity; however, direct study elucidate role energy on 2DSC remains undertaken. Here, an artificial system designed by randomly depositing nanoislands 2Delectron gas (2DEG). Quantum present graphene/Pb‐islands‐array hybrid, where behavior...
We show magnetotransport results on Ba(Fe$_{1-x}$Co$_x$)$_2$As$_2$ ($0.0 \leq x 0.13$) single crystals. identify the low temperature resistance step at 23 K in parent compound with onset of filamentary superconductivity (FLSC), which is suppressed by an applied magnetic field a similar manner to suppression bulk (SC) doped samples. FLSC found persist across phase diagram until long range antiferromagnetic order completely suppressed. A significant occurs for $0.02<x<0.04$, doping...