A5103238398- Iron-based superconductors research
- Rare-earth and actinide compounds
- Physics of Superconductivity and Magnetism
- X-ray Diffraction in Crystallography
- Magnetic properties of thin films
- Crystallization and Solubility Studies
- Advanced Condensed Matter Physics
- Corporate Taxation and Avoidance
- Advanced Neuroimaging Techniques and Applications
- Species Distribution and Climate Change
- Inorganic Chemistry and Materials
- Multiferroics and related materials
- Magneto-Optical Properties and Applications
- Magnetic and transport properties of perovskites and related materials
- Wildlife Ecology and Conservation
- Superconductivity in MgB2 and Alloys
- Nuclear materials and radiation effects
- Functional Brain Connectivity Studies
- Avian ecology and behavior
- Advanced MRI Techniques and Applications
State Key Laboratory of Surface Physics
2017-2025
Ocean University of China
2025
Fudan University
2014-2025
Surface K–dosed (Li 0.8 Fe 0.2 OH)FeSe provides new clues to understand the mechanism of FeSe-based superconductors.
Elucidating spin correlations in the parent compounds of high-temperature superconductors is crucial for understanding superconductivity. We used neutron scattering to study Li_{1-x}Fe_{x}ODFeSe, an insulating material with reduced electron carriers compared its superconducting counterpart (T_{c}=41 K), serving as undoped compound. Our findings show a total fluctuating moment this insulator relative FeSe and 122 iron pnictides, likely due increased interlayer distances from intercalation,...
Heavily electron-doped iron-selenide (HEDIS) high-transition-temperature (high-$T_{\rm{c}}$) superconductors, which have no hole Fermi pockets, but a notably high $T_{\rm{c}}$, challenged the prevailing $s$$_\pm$ pairing scenario originally proposed for iron pnictides containing both electron and pockets. The microscopic mechanism underlying enhanced superconductivity in HEDIS remains unclear. Here, we used neutron scattering to study spin excitations of material Li$_{0.8}$Fe$_{0.2}$ODFeSe...
We report neutron scattering measurements of the spinel oxide LiGaCr_{4}O_{8}, in which magnetic ions Cr^{3+} form a breathing pyrochlore lattice. Our experiments reveal coexistence nearly dispersionless resonance mode and dispersive spin-wave excitations magnetically ordered state, can be quantitatively described by quantum spin model hexagonal loops linear theory with same set exchange parameters, respectively. Comparison to other Cr oxides reveals relationship between energy lattice...
Resting state functional MRI (rs-fMRI), which is used to measure blood oxygen level-dependent (BOLD) from resting brains, a relatively new and powerful method for evaluating regional interactions that occur when participant not performing an
A new frustrated triangular lattice antiferromagnet Na 2 BaNi(PO 4 ) was synthesized by high temperature flux method. The two-dimensional is formed the Ni 2+ ions with S = 1. Its magnetism highly anisotropic Weiss constants θ CW –6.615 K ( H ⊥ c and –43.979 ∥ ). However, no magnetic ordering present down to 0.3 K, reflecting strong geometric spin frustration. Our heat capacity measurements show substantial residual entropy existing below at zero field, implying presence of low energy...
Elucidating spin correlations in the parent compounds of high-temperature superconductors is crucial for understanding superconductivity. We used neutron scattering to study Li$_{1-x}$Fe$_x$ODFeSe, an insulating material with reduced electron carriers compared its superconducting counterpart ($T_c$ = 41 K), serving as undoped compound. Our findings show a total fluctuating moment this insulator relative FeSe and 122 iron pnictides, likely due increased interlayer distances from...
We report polarized neutron scattering measurements of the low energy spin fluctuations iron-selenide superconductor Li$_{0.8}$Fe$_{0.2}$ODFeSe below and above its superconducting transition temperature $T_c=41$ K. Our experiments confirmed that resonance mode near 21 meV is magnetic. Moreover, excitations are essentially isotropic in space at 5$\leq E\leq$ 29 normal states. results suggest iron-based superconductors becomes when influence spin-orbit coupling magnetic/nematic order...
We perform an in-plane optical spectroscopy measurement on iron-based superconductor Li0.8Fe0.2ODFeSe single crystal. At room temperature, the low frequency conductivity shows incoherent characteristic; Drude component is absent. With temperature decreasing, develops and narrows rapidly. A well-defined plasma edge observed in reflectance spectrum at below 100 K, indicating a dramatically reduced scattering rate. The spectral weight contributed from free carriers even smaller than that of...
We report inelastic neutron scattering measurements of low-energy spin fluctuations in ${\mathrm{FeSe}}_{0.95}{\mathrm{S}}_{0.05}$ (${T}_{c}=10$ K). Our experiments revealed a resonance mode at 3.5 meV, accompanied by gap below 3 meV the stripe wave vector superconducting state. The is sharp energy and appears an level considerably lower than gap, implying that bound exciton rather enhanced paramagnon. An abrupt enhancement found nematic ordering temperature ${T}_{s}=80$ K. These results...