A5000581198- Iron-based superconductors research
- Rare-earth and actinide compounds
- Physics of Superconductivity and Magnetism
- Magnetic and transport properties of perovskites and related materials
- Advanced Condensed Matter Physics
- Inorganic Chemistry and Materials
- Heusler alloys: electronic and magnetic properties
- Superconductivity in MgB2 and Alloys
- Carbon Nanotubes in Composites
- Electromagnetic wave absorption materials
- Magnetic properties of thin films
- Meningioma and schwannoma management
- 2D Materials and Applications
- Pituitary Gland Disorders and Treatments
- Inorganic Fluorides and Related Compounds
- Multiferroics and related materials
- Polymer Nanocomposites and Properties
- Theoretical and Computational Physics
- Advanced Antenna and Metasurface Technologies
- Quantum and electron transport phenomena
- Graphene research and applications
- Electronic and Structural Properties of Oxides
- Metamaterials and Metasurfaces Applications
- Advanced Photocatalysis Techniques
- Advanced ceramic materials synthesis
Southeast University
2023-2025
First Affiliated Hospital of Fujian Medical University
2023-2025
Fujian Medical University
2023-2025
Shanghai Institute of Ceramics
2024
Chinese Academy of Sciences
2024
Nanjing Tech University
2020-2024
Boston College
2021-2024
Beijing Institute of Neurosurgery
2024
Nanfang Hospital
2024
Southern Medical University
2024
We report the synthesis, crystal structure, and physical properties of a quinary iron arsenide fluoride, KCa2Fe4As4F2. The new compound crystallizes in body-centered tetragonal lattice (space group I4/mmm, = 3.8684(2) Å, c 31.007(1) Z 2) that contains double Fe2As2 conducting layers separated by insulating Ca2F2 layers. Our measurements electrical resistivity, direct-current magnetic susceptibility, heat capacity demonstrate bulk superconductivity at 33 K
Significance Ferromagnetic insulators are highly needed as the necessary components in developing next-generation dissipationless quantum-spintronic devices. Such materials rare, and those high symmetric ones without chemical doping available so far only work below 16 K. Here we demonstrate a tensile-strained LaCoO 3 film to be strain-induced high-temperature ferromagnetic insulator. Both experiments first-principles calculations demonstrated that tensile-strain–supported ferromagnetism...
Superconductivity (SC) and local-moment ferromagnetism (FM) are mutually antagonistic collective phenomena, their genuine coexistence is rarely seen in nature. Although recent years have witnessed the possible of SC Eu-spin FM some doped EuFe${}_{2}$As${}_{2}$ systems, evidence simultaneous bulk obvious still absent. Here, authors report a robust iron pnictide RbEuFe${}_{4}$As${}_{4}$. The newly synthesized material virtually an intergrowth RbFe${}_{2}$As${}_{2}$ EuFe${}_{2}$As${}_{2}$,...
Phonons are known to generate a thermal Hall effect in certain insulators, including oxides with rare-earth impurities, quantum paraelectrics, multiferroic materials and cuprate Mott insulators. In each case, special feature of the material is presumed relevant for underlying mechanism that confers chirality phonons magnetic field. The question whether phonon an unusual occurrence - linked characteristics such as skew scattering off structural domains, ferroelectricity, ferromagnetism or...
We report the first nitrogen-containing iron-pnictide superconductor ThFeAsN, which is synthesized by a solid-state reaction in an evacuated container. The compound crystallizes ZrCuSiAs-type structure with space group P4/nmm and lattice parameters = 4.0367(1) Å c 8.5262(2) at 300 K. electrical resistivity dc magnetic susceptibility measurements indicate superconductivity 30 K for nominally undoped ThFeAsN.
Materials with strong magnetoresistive responses are the backbone of spintronic technology, magnetic sensors, and hard drives. Among them, manganese oxides a mixed valence cubic perovskite structure stand out due to their colossal magnetoresistance (CMR). A double exchange interaction underlies CMR in manganates, whereby charge transport is enhanced when spins on neighboring Mn3+ Mn4+ ions parallel. Prior efforts find different materials or mechanisms for resulted much smaller effect. Here...
CsCa$_2$Fe$_4$As$_4$F$_2$ is a newly discovered iron-based superconductor with $T_\mathrm{c}\sim$ 30 K containing double Fe$_2$As$_2$ layers that are separated by insulating Ca$_2$F$_2$ spacer layers. Here we report the transport and magnetization measurements on single crystals grown for first time using self flux of CsAs. We observed huge resistivity anisotropy $\rho_c(T)/\rho_{ab}(T)$, which increases decreasing temperature, from 750 at 300 to 3150 32 K. The $\rho_c(T)$ data exhibit...
We have synthesized four iron-based oxyarsenide superconductors Rb$Ln_2$Fe$_4$As$_4$O$_2$ ($Ln$ = Sm, Tb, Dy and Ho) resulting from the intergrowth of RbFe$_2$As$_2$ $Ln$FeAsO. It is found that lattice match between $Ln$FeAsO crucial for phase formation. The structural leads to double asymmetric Fe$_2$As$_2$ layers are separated by insulating $Ln_2$O$_2$ slabs. Consequently, materials intrinsically doped at a level 0.25 holes/Fe-atom and, bulk superconductivity emerges $T_\mathrm{c}$ 35.8,...
We report the results of a muon-spin rotation ($\ensuremath{\mu}\mathrm{SR}$) experiment to determine superconducting ground state iron-based superconductor ${\mathrm{CsCa}}_{2}{\mathrm{Fe}}_{4}{\mathrm{As}}_{4}{\mathrm{F}}_{2}$ with ${T}_{\mathrm{c}}\ensuremath{\approx}28.3\phantom{\rule{0.28em}{0ex}}\mathrm{K}$. This compound is related fully gapped ${\mathrm{CaCsFe}}_{4}{\mathrm{As}}_{4}$, but here Ca-containing spacer layer replaced one containing ${\mathrm{Ca}}_{2}{\mathrm{F}}_{2}$. The...
We have synthesized ten iron oxyarsenides, $\mathrm{K}L{n}_{2}{\mathrm{Fe}}_{4}{\mathrm{As}}_{4}{\mathrm{O}}_{2}$ $(Ln=\text{Gd},\text{Tb},\text{Dy},\text{and Ho})$ and $\mathrm{Cs}L{n}_{2}{\mathrm{Fe}}_{4}{\mathrm{As}}_{4}{\mathrm{O}}_{2}$ $(Ln\text{=}\text{Nd},\text{Sm},\text{Gd},\text{Tb},\text{Dy},\text{and Ho})$, with the aid of lattice-match approach. The resultant compounds possess hole-doped conducting double FeAs layers ${[A{\mathrm{Fe}}_{4}{\mathrm{As}}_{4}]}^{2\ensuremath{-}}$...
Several recent studies have shown that the anisotropy in magnetic structure of \ECA\ plays a significant role stabilizing Weyl nodes. To investigate relationship between and physics, we present comparative study EuZn$_2$As$_2$ EuCd$_2$As$_2$ are isostructural but with different anisotropy. We performed structural analysis, electronic transport, magnetization experiments on millimeter-sized single crystals EuZn$_2$As$_2$, compared results to those EuCd$_2$As$_2$. By combining first principle...
$\mathrm{Eu}{\mathrm{Cd}}_{2}{\mathrm{P}}_{2}$ is notable for its unconventional transport: upon cooling the metallic resistivity changes slope and begins to increase, ultimately 100-fold, before returning value. Surprisingly, this giant peak occurs at 18 K, well above N\'eel temperature (${T}_{N}$) of 11.5 K. Using a suite sensitive probes magnetism, including resonant x-ray scattering magneto-optical polarimetry, we have discovered that ferromagnetic order onsets ${T}_{N}$ in range peak....
EuZn$_2$P$_2$ was reported to be an insulating antiferromagnet with $T_\mathrm{N}$ of 23.5 K. In this study, single crystals exhibiting metallic behavior and a ferromagnetic order 72 K ($T_\mathrm{C}$) are successfully synthesized via salt flux method. The presence hole carriers induced by the Eu vacancies in lattice is found crucial for drastic changes magnetism electrical transport. mediate interlayer interaction, coupling strength directly related $T_\mathrm{C}$, as evidenced linear...
The coexistence of electric and magnetic orders with intrinsic coupling, referred to as magnetoelectric coupling in multiferroics, has been extensively studied oxide materials but remains relatively unexplored van...
We report the physical properties and electronic structure calculations of a layered chromium oxypnictide, ${\mathrm{Sr}}_{2}{\mathrm{Cr}}_{3}{\mathrm{As}}_{2}{\mathrm{O}}_{2}$, which crystallizes in ${\mathrm{Sr}}_{2}{\mathrm{Mn}}_{3}{\mathrm{As}}_{2}{\mathrm{O}}_{2}$-type containing both ${\mathrm{CrO}}_{2}$ planes ${\mathrm{Cr}}_{2}{\mathrm{As}}_{2}$ layers. The newly synthesized material exhibits metallic conduction with dominant electron-magnon scattering. Magnetic specific-heat...
We report synthesis, crystal structure and physical properties of a novel quinary compound RbGd2Fe4As4O2. The new iron oxyarsenide is isostructural to the fluo-arsenide KCa2Fe4As4F2, both which contain separate double Fe2As2 layers that are self hole-doped in stoichiometric composition. Bulk superconductivity at [Formula: see text] K demonstrated by measurements electrical resistivity, dc magnetic susceptibility heat capacity. An exceptionally high value initial slope upper critical field...
We have investigated the superconducting ground state of newly discovered superconductor ThFeAsN with a tetragonal layered crystal structure using resistivity, magnetization, heat capacity and transverse-field (TF) muon-spin rotation ($\mu$SR) measurements. Our resistivity magnetization measurements reveal an onset bulk superconductivity $T_{\bf c}\sim$ 30 K. The results show very small anomaly, $\Delta$C$_{ele}$$\sim$0.214 (J/mol-K) at K exhibits exponential behavior below c}$, which fits...
We report 75As-nuclear magnetic resonance (NMR) and nuclear quadrupole (NQR) measurements on transition-metal arsenides LaRu2As2, KCa2Fe4As4F2, A2Cr3As3. In the superconducting state of a Hebel- Slichter coherence peak is found in temperature dependence spin-lattice relaxation rate-1/T1 just below Tc, which indicates that LaRu2As2 full-gap superperconducor. For antiferromagnetic spin fluctuations are observed normal state. further find anisotropy rate RAF = Tc1/Tab1 small independent,...