A5017643662- Topological Materials and Phenomena
- Iron-based superconductors research
- Physics of Superconductivity and Magnetism
- Magnetic and transport properties of perovskites and related materials
- Advanced Condensed Matter Physics
- Rare-earth and actinide compounds
- Advanced Thermoelectric Materials and Devices
- Quantum and electron transport phenomena
- Quantum, superfluid, helium dynamics
- Graphene research and applications
- Electronic and Structural Properties of Oxides
- Intellectual Capital and Performance Analysis
- Magnetic properties of thin films
- Surface and Thin Film Phenomena
- Thermal properties of materials
- Corporate Taxation and Avoidance
- 2D Materials and Applications
- Advanced battery technologies research
- Inorganic Chemistry and Materials
- Magnetic Properties of Alloys
- Advancements in Battery Materials
- ZnO doping and properties
- Multiferroics and related materials
- Cold Atom Physics and Bose-Einstein Condensates
- Supercapacitor Materials and Fabrication
Chongqing University
2019-2025
Temper (United States)
2024
Southern University of Science and Technology
2021
Ningbo University
2021
Karlsruhe Institute of Technology
2016-2020
Hubei University of Automotive Technology
2020
Hong Kong University of Science and Technology
2012-2016
University of Hong Kong
2012-2016
The unprecedented phenomenon that a charge density wave (CDW) emerges inside the antiferromagnetic (AFM) phase indicates an unusual CDW mechanism associated with magnetism in FeGe. Here, we demonstrate both and of FeGe can be effectively tuned through postgrowth annealing treatments. Instead short-range reported earlier, long-range order is realized below 110 K single crystals annealed at $320\text{ }\ifmmode^\circ\else\textdegree\fi{}\mathrm{C}$ for over 48 h. AFM transition temperatures...
Abstract Exotic quantum states arise from the interplay of various degrees freedom such as charge, spin, orbital, and lattice. Recently, a short-ranged charge order (CO) was discovered deep inside antiferromagnetic phase Kagome magnet FeGe, exhibiting close relationships with magnetism. Despite extensive investigations, CO mechanism remains controversial, mainly because behavior hinders precise identification superstructure. Here, combining multiple experimental techniques, we report...
The kagome materials $A{\mathrm{V}}_{3}{\mathrm{Sb}}_{5}$ ($A=\mathrm{K}$, Rb, Cs) host an intriguing interplay between unconventional superconductivity and charge-density waves. Here, we investigate ${\mathrm{CsV}}_{3}{\mathrm{Sb}}_{5}$ by combining high-resolution thermal-expansion, heat-capacity, electrical resistance under strain measurements. We directly unveil that the superconducting charge-ordered states strongly compete, this competition is dramatically influenced tuning...
We present a comprehensive study of the low-temperature heat capacity and thermal expansion single crystals hole-doped Ba1-xKxFe2As2 series (0<x<1) end-members RbFe2As2 CsFe2As2. A large increase Sommerfeld coefficient is observed with both decreasing band filling isovalent substitution (K, Rb, Cs) revealing strong enhancement electron correlations possible proximity these materials to Mott insulator. This trend well reproduced theoretically by our Density-Functional Theory + Slave-Spin...
We present a study of Seebeck and Nernst effect in combination with magnetoresistance Hall measurements the Kagome superconductor ${\mathrm{CsV}}_{3}{\mathrm{Sb}}_{5}$. A sizable magneto-Seebeck signal appears once charge density wave (CDW) order sets below ${T}_{\text{CDW}}=94$ K. The peaks at lower temperature ${T}^{*}\ensuremath{\sim}35\phantom{\rule{0.16em}{0ex}}\mathrm{K}$, crossing which coefficient switches sign, we attribute to ambipolar transport compensated bands due multiband...
We present heat capacity, electrical, and thermal transport measurements of kagome metals $A{\mathrm{V}}_{3}{\mathrm{Sb}}_{5}$ $(A=\mathrm{K},\mathrm{Rb},\mathrm{Cs})$. In all three compounds, the development short-range charge fluctuations above density wave (CDW) transition temperature ${T}_{\mathrm{CDW}}$ strongly scatters phonons via electron-phonon coupling, leading to glasslike phonon transport, i.e., conductivity decreases weakly upon cooling. Once long-range order sets in below...
Lithium is an important raw material for new energy-powered vehicles, and ensuring its supply of great significance global green sustainable development. Salt Lake brine the main...
Two-dimensional (2D) magnetic materials have attracted considerable interest owing to their potential applications in spintronics and fundamental investigations into low-dimensional magnetism. Cr2Te3, a quasi 2D non van der Waals magnet, exhibits complex phase diagram due competing interactions within between layers. However, the precise nature evolution of these phases remain unclear. Here, we utilize an ultrahigh-sensitive composite magnetoelectric technique, which probes ac...
We present electrical and thermal specific heat measurements that show superconductivity in double-wall carbon nanotube (DWCNT) bundles. Clear evidence, comprising a resistance drop as function of temperature, magnetoresistance differential signature the supercurrent, suggest an intrinsic superconducting transition below 6.8 K for one particular sample. Additional data not only confirm existence superconductivity, but also indicate T(c) distribution can arise from diversity diameter...
We have produced ultrathin lead (Pb) nanowires in the 6 nm pores of SBA-15 mesoporous silica substrates by chemical vapor deposition. The form regular and dense arrays. demonstrate that bulk Pb (a type-I superconductor below Tc = 7.2 K with a critical field 800 Oe) can be tailored nanostructuring to become type-II an upper (Hc2) exceeding 15 T signs Cooper pairing 3–4 above Tc. material undergoes crossover from one-dimensional fluctuating superconducting state at high temperatures...
The in-plane resistivity and uniform magnetic susceptibility anisotropies of $BaFe_{2}As_{2}$ are obtained with a new method, in which large symmetry-breaking uniaxial strain is applied using substrate very anisotropic thermal expansion. anisotropy its corresponding elastoresistivity exhibit similar diverging behavior as those from piezo-stack experiments. This suggests that the more direct measure magnetism than nematicity, since nematic transition no longer well-defined under strain. In...
The nature of the nematic state in FeSe remains one major unsolved mysteries Fe- based superconductors. Both spin and orbital physics have been invoked to explain origin this phase. Here we present experimental evidence for frustrated, short-range magnetic order, as suggested by several recent theoretical works, FeSe. We use a combination magnetostriction, susceptibility resistivity measurements probe in-plane anisotropies its associated fluctuations. Despite absence long-range order FeSe,...
Superconductivity in FeSe has recently attracted a great deal of attention because it emerges out an electronic nematic state elusive character. Here we study both the normal and superconducting gap structure using heat-capacity measurements on high-quality single crystals. The specific-heat curve, from 0.4 K to Tc = 9.1 K, is found be consistent with recent determination Bogoliubov quasiparticle interference [P. O. Sprau et al., Science 357, 75 (2017)], however only if nodes are introduced...
Thermoelectric materials can recover electrical energy from waste heat and vice versa, which are of great significance in green harvesting solid state refrigerators. The thermoelectric figure merit ($z\mathrm{T}$) quantifies the conversion efficiency, a large Seebeck or Nernst effect is crucial for development devices. Here we present significantly thermopower topological semimetal ${\mathrm{ZrTe}}_{5}$, attributed to both strong Berry curvature bipolar transport. largest in-plane ${S}_{xy}$...
We report electrical and thermal transport properties of single-crystalline kagome metals $A{\text{Ti}}_{3}{\text{Bi}}_{5}\phantom{\rule{4pt}{0ex}}(A=\text{Rb},\phantom{\rule{4pt}{0ex}}\mathrm{Cs})$. Different from the structrually similar superconductors $A{\mathrm{V}}_{3}{\mathrm{Sb}}_{5}$, no charge density wave instabilities are found in $A{\mathrm{Ti}}_{3}{\mathrm{Bi}}_{5}$. At low temperatures below 5 K, signatures superconductivity appear $A{\mathrm{Ti}}_{3}{\mathrm{Bi}}_{5}$ as seen...
Abstract We report a large negative magnetoresistance in Manganese-substituted Zinc Oxide thin films. This anomalous effect was found to appear oxygen-deficient films and increase with the concentration of Manganese. By combining magnetoresistive measurements magneto-photoluminescence, we demonstrate that can be explained as result magnetically induced transition from hopping band conduction where activation energy is caused by sp-d exchange interaction.
Room temperature ferromagnetism (FM) of these thin film samples are highly tuneable by the simultaneous presence CuO nanophases and multivalent Cu Vö concentrations.
We demonstrate that surface relaxation, which is insignificant in trilayer graphene, starts to manifest Bernal-stacked tetralayer graphene. few-layer graphene has been investigated by analyzing its Landau level spectra through quantum capacitance measurements. find the interlayer interaction parameters were similar of graphite. However, hopping between bulk and bilayers are quite different. This shows a direct evidence for relaxation phenomena. In spite fact Van der Waals carbon layers...
Magnetic topological semimetals provide new opportunities for power generation and solid-state cooling based on thermoelectric (TE) effect. The interplay between magnetism nontrivial band topology prompts the magnetic to yield strong transverse TE effect, while longitudinal performance is usually poor. Herein, it demonstrated that Weyl semimetal TbPtBi has high value both thermopower with large factor (PF). At 300 K 13.5 Tesla, PF reach up 214 µV K-1 35 µW cm-1 K-2 , respectively, which are...
The transition metal carbide superconductor Sc3CoC4 may represent a new benchmark system of quasi-one-dimensional (quasi-1D) superconducting behavior. We investigate the high-quality single crystalline sample by electrical transport experiments. Our data show that goes through complex dimensional crossover below onset Tc 4.5 K. First, quasi-1D fluctuating state with finite resistance forms in [CoC4]∞ ribbons which are embedded Sc matrix this material. At lower temperature, transversal...