A5100377194- Iron-based superconductors research
- Magnetic and transport properties of perovskites and related materials
- Rare-earth and actinide compounds
- Advanced Condensed Matter Physics
- Physics of Superconductivity and Magnetism
- Topological Materials and Phenomena
- Electronic and Structural Properties of Oxides
- Intellectual Capital and Performance Analysis
- Corporate Taxation and Avoidance
- Inorganic Chemistry and Materials
- Crystallization and Solubility Studies
- High-pressure geophysics and materials
- X-ray Diffraction in Crystallography
- Magnetic Properties of Alloys
- Quantum and electron transport phenomena
- Magnetic properties of thin films
- Quantum, superfluid, helium dynamics
- Multiferroics and related materials
- Graphene research and applications
- Cold Atom Physics and Bose-Einstein Condensates
- Superconductivity in MgB2 and Alloys
- Luminescence Properties of Advanced Materials
- Crystal Structures and Properties
- Chalcogenide Semiconductor Thin Films
- Perovskite Materials and Applications
Sun Yat-sen University
2016-2025
National Science Center
2025
Qingdao University
2025
Affiliated Hospital of Qingdao University
2025
Sichuan University
2024
China University of Mining and Technology
2024
Shanghai University of Engineering Science
2024
The First Affiliated Hospital, Sun Yat-sen University
2017-2024
University Medical Center
2024
Bridge University
2018-2024
Heterostructure based interface engineering has been proved an effective method for finding new superconducting systems and raising superconductivity transition temperature (TC). In previous work on one unit-cell (UC) thick FeSe films SrTiO3 (STO) substrate, a superconducting-like energy gap as large 20 meV, was revealed by in situ scanning tunneling microscopy/spectroscopy (STM/STS). Angle resolved photoemission spectroscopy (ARPES) further nearly isotropic of above 15 which closes at ~ 65...
The newly discovered Ruddlesden-Popper bilayer ${\mathrm{La}}_{3}{\text{Ni}}_{2}{\mathrm{O}}_{7}$ reaches a remarkable superconducting transition temperature ${T}_{c}\ensuremath{\approx}80\text{ }\text{ }\mathrm{K}$ under pressure of above 14 GPa. Here we propose minimal two-orbital model the high-pressure phase ${\mathrm{La}}_{3}{\text{Ni}}_{2}{\mathrm{O}}_{7}$. Our is constructed with Ni-$3{d}_{{x}^{2}\ensuremath{-}{y}^{2}}$, $3{d}_{3{z}^{2}\ensuremath{-}{r}^{2}}$ orbitals by using Wannier...
Abstract The latest discovery of high temperature superconductivity near 80 K in La 3 Ni 2 O 7 under pressure has attracted much attention. Many proposals are put forth to understand the origin superconductivity. determination electronic structures is a prerequisite establish theories nickelates but still lacking. Here we report our direct measurement by high-resolution angle-resolved photoemission spectroscopy. Fermi surface and band observed compared with structure calculations. Strong...
The discovery of superconductivity with a critical temperature about 80 K in La3Ni2O7 single crystals under pressure has received enormous attention. is not superconducting ambient but exhibits transition at T ∗ ≃ 115 K. Understanding the electronic correlations and charge dynamics an important step towards origin other instabilities. Here, our optical study shows that features strong which significantly reduce electron's kinetic energy place this system proximity Mott phase. low-frequency...
Very recently, a new superconductor with Tc = 80 K has been reported in nickelate (La3Ni2O7) at around 15–40 GPa conditions (Nature, 621, 493, 2023), which is the second type of unconventional superconductor, besides cuprates, above liquid nitrogen temperature. However, phase diagram plotted this report was mostly based on transport measurement under low-temperature and high-pressure conditions, assumed corresponding X-ray diffraction (XRD) results were carried out room This encouraged us to...
High-temperature superconductivity was discovered in the pressurized nickelate La3Ni2O7 which has a unique bilayer structure and mixed valence state of nickel. The properties at ambient pressure contain crucial information fundamental interactions bosons mediating superconducting pairing. Here, using X-ray absorption spectroscopy resonant inelastic scattering, we identified that Ni 3 $${d}_{{x}^{2}-{y}^{2}}$$ , $${d}_{{z}^{2}}$$ ligand oxygen 2p orbitals dominate low-energy physics with...
Abstract The recently discovered high- T c superconductor La 3 Ni 2 O 7 has sparked renewed interest in unconventional superconductivity. Here we study superconductivity pressurized based on a bilayer two-orbital t − J model, using the renormalized mean-field theory. Our results reveal robust s ± -wave pairing driven by inter-layer $${d}_{{z}^{2}}$$ <mml:math...
In conventional Bardeen-Cooper-Schrieffer (BCS) superconductors, superconductivity occurs when electrons form coherent Cooper pairs below the superconducting transition temperature Tc. Although kinetic energy of paired increases in state relative to normal state, reduction ion lattice is sufficient give condensation energy. For iron pnictide superconductors derived from electron or hole doping their antiferromagnetic (AF) parent compounds, microscopic origin for supercnductivity unclear....
Electronic correlation is of fundamental importance to high temperature superconductivity. While the low energy electronic states in cuprates are dominantly affected by effects across phase diagram, observation correlation-driven changes fermiology amongst iron-based superconductors remains rare. Here we present experimental evidence for a reconstruction Fermi surface tuned independently two orthogonal axes and Se/Te ratio iron chalcogenide family FeTe$_{1-x}$Se$_x$. We demonstrate that this...
The newly discovered Ruddlesden-Popper bilayer La$_3$Ni$_2$O$_7$ reaches an remarkable superconducting transition temperature $T_c$ = 80 K under a pressure of above 14 GPa. Here we propose minimal two-orbital model the high-pressure phase La$_3$Ni$_2$O$_7$. Our is constructed with Ni-3d$_{x^2-y^2}$, 3d$_{3z^2-r^2}$ orbitals by using Wannier downfolding density functional theory calculations, which captures key ingredients material, such as band structure and Fermi surface topology. There are...
The discovery of superconductivity with a critical temperature about 80~K in La$_{3}$Ni$_{2}$O$_{7}$ single crystals under pressure has received enormous attention. is not superconducting ambient but exhibits transition at $T^{\ast} \simeq 115$~K. Understanding the electronic correlations and charge dynamics an important step towards origin other instabilities. Here, our optical study shows that features strong which significantly reduce electron's kinetic energy place this system proximity...
Density wave (DW) order is believed to be correlated with superconductivity in the recently discovered high-temperature superconductor La3Ni2O7. However, experimental investigations of its evolution under high pressure are still lacking. Here, we explore quasiparticle dynamics bilayer nickelate La3Ni2O7 single crystals using ultrafast optical pump-probe spectroscopy pressures up 34.2 GPa. At ambient pressure, temperature-dependent relaxation demonstrate a phonon bottleneck effect due opening...