A5084249377- Physics of Superconductivity and Magnetism
- Iron-based superconductors research
- Magnetic and transport properties of perovskites and related materials
- Rare-earth and actinide compounds
- Magnetic properties of thin films
- Electronic and Structural Properties of Oxides
- Corporate Taxation and Avoidance
- Magnetic Properties and Applications
- Advanced Condensed Matter Physics
- Surface and Thin Film Phenomena
- Superconductivity in MgB2 and Alloys
- Quantum, superfluid, helium dynamics
- Superconducting Materials and Applications
- Metal and Thin Film Mechanics
- Chalcogenide Semiconductor Thin Films
Chinese Academy of Sciences
2019-2025
Czech Academy of Sciences, Institute of Physics
2022-2025
University of Chinese Academy of Sciences
2021-2024
Institute of Physics
2019-2024
National Laboratory for Superconductivity
2021-2023
The origin of the linear-in-temperature (<a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mi>T</a:mi></a:math>-linear) resistivity in cuprate superconductors remains a profound mystery condensed matter physics. Here, we investigate dependence <b:math xmlns:b="http://www.w3.org/1998/Math/MathML"><b:mi>T</b:mi></b:math>-linear coefficient on doping, i.e., <c:math...
We report the evolution of electrical transport properties in insulating FeSe films with electron doping induced by ionic liquid gating technique. Superconductivity never emerges strong insulators variable-range hopping behavior but is shown to arise once resistance normal state varies as $ln(1/T)$, indicating that this corresponds minimal conducting character for developing superconductivity. Our work points toward granular metallicity $ln(1/T)$ behavior, suggesting emergence...
We combine in-situ electrical transport and Seebeck coefficient measurements with the ionic liquid gating technique to investigate superconductivity normal state of FeySe1-xTex (FST) films. find that pristine FST films feature a non-Fermi temperature dependence coefficient, i.e., S/T ~ AS lnT, is strongly correlated superconducting transition (Tc). Ionic significantly raises Tc films, for which displays novel scaling behavior retains logarithmic dependence. Moreover, quantitative...
The magnetic penetration depth (<i>λ</i>) of a superconductor is an important parameter which connects the macroscopic electrodynamics with microscopic mechanism superconductivity. High-accuracy measurement <i>λ</i> great significance for revealing pairing superconductivity and exploring applications superconductors. Among various methods used to measure superconducting films, two-coil mutual inductance (MI) technique has been widely adopted due its high precision...
A dead layer without superconductivity, i.e., zero resistance and Meissner effect, commonly exists at the interface between substrate superconducting film. It is demonstrated that can significantly degrade performance of devices microwave frequencies. Knowing thickness layer, ${d}_{\mathrm{dead}}$, necessary when using a two-coil mutual-inductance (TCMI) technique to measure absolute value magnetic penetration depth, $\ensuremath{\lambda}$, in films. However, there still no established...
High quality Nb films were successfully prepared on both flexible polyimide (PI) and rigid Al 2 O 3 substrates their transport properties systematically studied at various applied currents, external magnetic fields, sample orientations. It is found that a curved Nb/PI film exhibits quite different superconducting transition vortex dynamics compared to the flat Nb/Al film. For film, smooth transitions obtained low while unexpected cascade structures revealed in ρ ( T ) curves high currents....
Strange-metal behavior has been observed in superconductors ranging from cuprates to pressurized nickelates, but its relationship unconventional superconductivity remains elusive. Here, we perform operando superfluid density measurements on ion-gated FeSe films. We observe for the first time a synchronized evolution of superconducting condensate and strange-metal phase with electron doping. A linear scaling between zero-temperature resistivity coefficient is further established, which nails...
We combine in-situ electrical transport and Seebeck coefficient measurements with the ionic liquid gating technique to investigate superconductivity normal state of FeySe1-xTex (FST) films. find that pristine FST films feature a non-Fermi temperature dependence coefficient, i.e., S/T ~ AS lnT, is strongly correlated superconducting transition (Tc). Ionic significantly raises Tc films, for which displays novel scaling behavior retains logarithmic dependence. Moreover, quantitative...
This article first reports the preparation of superconducting FeSe films on fluorophlogopite-mica (F-mica) substrates by pulsed laser deposition technique. The quality is significantly improved optimizing conditions, such as substrate temperature and energy. Through mechanical exfoliation F-mica substrates, obtain excellent flexibility. After repeated bending in atmosphere, surface morphology properties these substantially remain unchanged. Furthermore, we use a homemade device to apply...
Modifying the normal state charge carriers and related Fermi surface can significantly affect a material's superconducting state. The recently discovered dome as function of chemical concentration in transition metal nitrides provides promising platform for achieving such control. However, this effort was hindered by synthesis techniques that cannot stabilize structure presence significant number nitrogen vacancies. In study, we employed oxygen-assisting gas flow with radio frequency...
In the previous four decades, a two-coil mutual inductance (MI) technique has been widely employed in characterizing magnetic penetration depth, $\lambda$, of superconducting films. However, conventional methods used to obtain $\lambda$ are not applicable small-sized films with common shapes, which limits application MI superconductivity research. Here, we first fast wavelet collocation (FWC) method system and then proposed possibility directly obtaining absolute polygonal arbitrary sizes....