A5079933513- Iron-based superconductors research
- Topological Materials and Phenomena
- Advanced Condensed Matter Physics
- 2D Materials and Applications
- Quantum, superfluid, helium dynamics
- Rare-earth and actinide compounds
- Graphene research and applications
- Corporate Taxation and Avoidance
- Multiferroics and related materials
- Electronic and Structural Properties of Oxides
- Quantum many-body systems
- Chalcogenide Semiconductor Thin Films
- Intellectual Capital and Performance Analysis
- Machine Learning in Materials Science
- Physics of Superconductivity and Magnetism
- Theoretical and Computational Physics
- Magnetic and transport properties of perovskites and related materials
- Magnetic properties of thin films
Peking University
2021-2024
Beijing Academy of Quantum Information Sciences
2021-2024
Renmin University of China
2018-2022
We report the effects of cobalt doping on magnetic properties two-dimensional van der Waals ferromagnet Fe3GeTe2. Single crystals (Fe{1-x}Cox)3GeTe2 with x=0-0.78 were successfully synthesized and characterized x-ray diffraction, energy dispersive spectroscopy magnetization measurements. Both Curie-Weiss temperature ferromagnetic (FM) ordered moment Fe3GeTe2 are gradually suppressed upon Co doping. A kink in zero-field-cooling low field M(T) curve which is previously explained as an...
Abstract Transition metal compounds with kagome structure have been found to exhibit a variety of exotic structural, electronic, and magnetic orders. These orders are competing energies very close each other, resulting in complex phase transitions. Some the phases easily observable, such as charge density wave (CDW) superconducting phase, while others more challenging identify characterize. Here we present magneto-transport evidence new below ~ 35 K topological CsV 3 Sb 5 (CVS) thin flakes...
Comparing with the widely known transitional metal based van der Waals (vdW) materials, rare-earth ones are rarely explored in research of intrinsic two-dimensional (2D) magnetism. In this work, we report physical properties DyOCl, a vdW magnetic insulator direct band gap $\sim 5.72~eV$. The order bulk DyOCl is determined by neutron scattering as $A$-type antiferromagnetic structure below N\'{e}el temperature $T_N=10~$K. large moment near 10.1 $ \mu_{B} $/Dy lies parallel to $a$-axis strong...
In van der Waals heterostructures (vdWHs), the manipulation of interlayer stacking/coupling allows for construction customizable quantum systems exhibiting exotic physics. An illustrative example is diverse range states matter achieved through varying proximity coupling between two-dimensional (2D) spin liquid (QSL) and superconductors within TaS2 family. This study presents a demonstration intertwined physics spontaneous rotational symmetry breaking, hidden magnetism, Ising...
Abstract Linear nonsaturating magnetoresistance (LMR) represents a class of anomalous resistivity response to external magnetic field that has been observed in variety materials including but not limited topological semi-metals, high- T c superconductors and with charge density wave (CDW)/spin orders. Here we report the observation LMR layered kagome superconductor CDW material CsV 3 Sb 5 thin flakes, as well dimensional crossover temperature ( ) such LMR. Specifically, ultrathin crystals,...
We report the doping effects of cobalt on van der Waals (vdW) magnet Fe$_5$GeTe$_2$. A series (Fe$_{1-x}$Co$_x$)$_5$GeTe$_2$ (0$\leq$x$\leq$0.44) single crystals have been successfully grown, their structural, magnetic and transport properties are investigated. For x=0.20, The Curie temperature $T_C$ increases from 276~K to 337~K. Moreover, easy-axis is reoriented $ab$-plane $c$-axis in undoped Fe$_5$GeTe$_2$ with largely enhanced anisotropy. These would make...
$\mathrm{Zr}{\mathrm{Te}}_{5}$ is a layered material that exhibits intricate topological effects. Intensive theoretical and experimental efforts have been devoted to try understand the physics in this material. In paper temperature dependent magnetotransport properties of thin flakes are investigated. A characteristic ${T}^{*}$ observed dependence three different types magnetoresistance simultaneously, which saturated Hall anomaly, chiral longitudinal magnetoresistance. Furthermore, value...
Fe5GeTe2 single crystals can be divided into nonquenched (NQ) and quench-cooled (QC) phases with different magnetic properties. A comprehensive understanding of the property variations in NQ QC is imperative for guiding towards spintronics applications; however, it remains elusive. Here, we report a real-space study on structural properties these two using cryogenic force microscopy scanning tunneling microscopy. The thermal history introduces disorder order to Fe(1) sites, resulting...
Transition metal compounds with kagome structure have been found to exhibit a variety of exotic structural, electronic, and magnetic orders. These orders are competing energies very close each other, resulting in complex phase transitions. Some the phases easily observable, such as charge density wave (CDW) superconducting phase, while others more challenging identify characterize. Here we present magneto-transport evidence new below ~35 K topological CsV$_3$Sb$_5$ (CVS) thin flakes between...
The quantum Griffiths singularity (QGS) is a phenomenon driven by quenched disorders that break conventional scaling invariance and result in divergent dynamical critical exponent during phase transitions (QPT). While this has been well-documented low-dimensional superconductors three-dimensional (3D) magnetic metal systems, its presence 3D superconducting systems unconventional high-temperature (high-Tc SCs) remains unclear. In study, we report the observation of robust QGS...
The quantum Griffiths singularity (QGS) is a phenomenon driven by quenched disorders that break conventional scaling invariance and result in divergent dynamic critical exponent during phase transitions (QPT). While this has been well-documented low-dimensional superconductors three-dimensional (3D) magnetic metal systems, its presence 3D superconducting systems unconventional high-temperature (high-
In van der Waals heterostructures (vdWHs), the manipulation of interlayer stacking/coupling allows for construction customizable quantum systems exhibiting exotic physics. An illustrative example is diverse range states matter achieved through varying proximity coupling between two-dimensional (2D) spin liquid (QSL) and superconductors within TaS2 family. This study presents a demonstration intertwined physics spontaneous rotational symmetry breaking, hidden magnetism, Ising...
The vanadium doping effects on the superconductivity and magnetism of iron pnictides are investigated in $\mathrm{Ba}{({\mathrm{Fe}}_{0.92\ensuremath{-}x}{\mathrm{Co}}_{0.08}{\mathrm{V}}_{x})}_{2}{\mathrm{As}}_{2}$ by transport, susceptibility, neutron scattering measurements. magnetic impurity V causes a fast suppression with ${T}_{C}$ reduced at rate approximately 7.4 K/1% V. On other hand, for $x\ensuremath{\ge}0.02$, long-range $C$-type antiferromagnetic order is recovered upon doping,...
We report an investigation of the structural, magnetic and electronic properties Ba(Fe1−xVx)2As2 using x-ray, transport, susceptibility neutron scattering measurements. The vanadium substitutions in Fe sites are possible up to ∼40%. Hall effect measurements indicate strong hole-doping through V doping, while no superconductivity is observed all samples down 2 K. antiferromagnetic structural transition temperature BaFe2As2 gradually suppressed finite temperature, then vanishes at with...
We report an investigation on the single crystal growth, magnetic and transport properties of EuIn 2 (As 1− x P ) (0 ≤ 1). The physical axion insulator candidate As can be effectively tuned by P-doping. With increasing , c -axis lattice parameter decreases linearly, transition temperature gradually increases ferromagnetic interactions are enhanced. This is similar to previously reported high pressure effect . For = 0.40, a spin glass state at T g 10 K emerges together with observations...
We have systematically studied the nematic susceptibility in non-superconducting Ba(Fe$_{1-x}$TM$_{x}$)$_2$As$_2$ (TM = Cr, Mn, V and Cu) by measuring uniaxial pressure dependence of resistivity along Fe-As-Fe direction. The susceptibilities all samples show Curie-Weiss-like behavior at high temperatures, where Curie constant $A_n$ can be derived, similar to a paramagnetism. While these dopants do not introduce superconductivity BaFe$_2$As$_2$, their effects on fluctuations are different. In...
Linear nonsaturating magnetoresistance (LMR) represents a class of anomalous resistivity response to external magnetic field that has been observed in variety materials including but not limited topological semi-metals, high-Tc superconductors and with charge/spin density wave (CDW/SDW) orders. Here we report the observation LMR layered kagome superconductor CDW material CsV3Sb5 thin flakes, as well dimensional crossover temperature (T) such LMR. Specifically, ultrathin crystals, (MR)...