A5086006663- Physics of Superconductivity and Magnetism
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Superconducting Materials and Applications
- Magnetic properties of thin films
- Superconductivity in MgB2 and Alloys
- Advanced Condensed Matter Physics
- Rare-earth and actinide compounds
- High-pressure geophysics and materials
- Iron-based superconductors research
- Magnetic and transport properties of perovskites and related materials
- Magnetic Properties and Applications
- Boron and Carbon Nanomaterials Research
- Induction Heating and Inverter Technology
- Graphene research and applications
- Chemical and Physical Properties of Materials
- Metallic Glasses and Amorphous Alloys
- Quantum and electron transport phenomena
- Atomic and Subatomic Physics Research
- Silicon Carbide Semiconductor Technologies
- Power Transformer Diagnostics and Insulation
- MXene and MAX Phase Materials
- Scientific Research and Discoveries
- Thermodynamic and Structural Properties of Metals and Alloys
- Intellectual Capital and Performance Analysis
Hebei University of Technology
2023-2024
North China Electric Power University
2024
China Electric Power Research Institute
2024
National Laboratory for Superconductivity
1997-2019
Chinese Academy of Sciences
1991-2019
University of Chinese Academy of Sciences
2018
Institute of Physics
1988-2007
Soochow University
2007
Academia Sinica
1993
Northwestern University
1989
The pressure-induced reemergence of the second high-Tc superconducting phase (SC-II) in alkali-metal intercalated AxFe2-ySe2 (A = K, Rb, Cs, Tl) remains an enigma and proper characterizations on superconducting- normal-state properties SC-II were hampered by intrinsic inhomogeneity separation. To elucidate this intriguing problem, we performed a detailed high-pressure magnetotransport study recently discovered (Li1-xFex)OHFe1-ySe single crystals, which have high Tc~40 K share similar Fermi...
The Majorana zero mode (MZM), which manifests as an exotic neutral excitation in superconductors, is the building block of topological quantum computing. It has recently been found vortices several iron-based superconductors a zero-bias conductance peak tunneling spectroscopy. In particular, clean and robust MZM observed cores free (Li0.84Fe0.16)OHFeSe. Here using scanning spectroscopy, we demonstrate that Majorana-induced resonant Andreev reflection occurs between STM tip this bound state,...
Accurate evaluation of the leakage inductance high-frequency transformers is significant for improving operating model and power transmission efficiency isolated dc-dc converters. Compared with conventional methods, data-driven methods inspired by machine learning seem to be more advantageous assessment. However, complex structure litz-wire windings hinders extraction simulation datasets, leading challenges in application methods. This article proposes a method that can efficiently extract...
The velocity of ultrasound was measured on sinter-forged polycrystalline $\mathrm{Y}{\mathrm{Ba}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7\ensuremath{-}\ensuremath{\delta}}$ samples with a superconducting transition temperature 91 K. forging process results in crystallites which are preferentially aligned their $c$ axis parallel to the as confirmed from optical and x-ray measurements. Sound-velocity measurements show that material is elastically anisotropic. dependence sound shows distinct...
The optimal design of high-frequency transformers requires not only an accurate and efficient description the litz-wire winding but also precise characterization electromagnetic field properties that vary with transformer structure. However, most existing methods focus on twisting structure litz wire itself, neglecting magnetic variation over entire region in optimization process. In this article, a loss calculation method for balances accuracy efficiency is presented, which describes...
We have prepared two kinds of single crystals in Bi-Sr-Ca-Cu oxides by flux method;plate-like which exhibit metal to superconductor at 93 K, being the high-T c layered compound BiSr (Ca 0.35 Sr 0.25 Bi 0.40 ) 2 Cu O y with orthorhombic structure a=5.42 Å, b=5.44 Å and c=30.78 respectively, another kind bar-shapedbismuth-poor is superconducting temperature below 82K whilebeing semiconducting above this temperature.
Abstract Among the metal hydrides, Th 4 H 15 is first reported superconductor with a relatively high T c ≈ 8 K at ambient pressure. Here we report on synthesis and characterization of low- superconducting modification , which obtained via hydrogenating 5 GPa 800 °C by using ammonia borane as hydrogen source. Measurements resistivity, magnetic susceptibility, specific heat confirm that sample shows bulk transition 6 K, about 2 lower than previously. Various characteristic parameters have been...
We report ultrasonic attenuation measurements on sinter-forged $\mathrm{Y}{\mathrm{Ba}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7\ensuremath{-}\ensuremath{\delta}}$ material, which differs from ordinary sintered material in that the crystallites are preferentially oriented to form a uniaxial sample. Three peaks attenuation, at temperatures of 250, 180, and 70 K, were observed for longitudinal waves propagating perpendicular forging axis, is similar reported (isotropic) polycrystalline samples....
Structural modulation waves in the Pb-doped Bi-2223 (Bi2Sr2Ca2Cu3Ox) phase are observed for first time on potential distribution function projected along a axis. The newly developed multidimensional direct methods were used. Unlike previous techniques, there is no need to assume any model before can be seen directly from resulting Fourier map. symmetry of title compound belongs four-dimensional space group P111Bbmb with three-dimensional unit cell parameters a=5.49 AA, b=5.41 c=37.1 alpha =...
The structural changes and superconductivity of La1.85−2xSr2x+0.15Cu1−xRuxO4 (I) La1.85Sr0.15Cu1−xRuxO4 (II) systems have been investigated. It was observed that the Ru doping strongly suppresses Tc. critical contents xc for Tc disappearances are respectively 0.0225 0.019 systems. found in all La1.85Sr0.15Cu1−xMxO4 investigated (M = Ru, Li, V, Sn, Al, Ga, Co, Fe, Mn, Mg, Ni Zn), structure parameter c/a ratios decrease with increasing content x, which is a common characteristic. mechanisms...
We performed an extensive investigation on the correlations among superconductivity, structural instability, and band filling in ${\mathrm{Nb}}_{1\ensuremath{-}x}{\mathrm{B}}_{2}$ materials. Structural measurements reveal that a notable phase transformation occurs at $x\ensuremath{\approx}0.2$, corresponding to Fermi level $({E}_{F})$ pseudogap with minimum total density of states (DOS) as demonstrated by first-principles calculations. Superconductivity generally becomes visible Nb-deficient...
Synthesis, lattice parameter changes, grain morphology, superconductivity and specific heat of a new superconductor Nb(1-x)Mg(x)B(2) (0.0 <= x 0.40) series were reported. Magnetization resistance measurements indicate that the superconducting transition temperature T(C) with = 0.10-0.40 is similar to 5 K. A large Meissner signal result superconductors have bulk superconductivity. The Debye theta(D) determined by measurement 419(+/- 10) K for Nb(0.75)Mg(0.25)B(2).
The transverse magnetoresistance and Hall effect have been studied for n-type gray tin epilayers grown on (001)CdTe substrates by the molecular beam epitaxy technique. Shubnikov–de Haas oscillations were observed in samples having mobilities ≥104 cm2 /V s at low temperatures. Measurements carried out using both dc method field modulation techniques temperature range from 1.2 to 10 K magnetic fields up T. Beat patterns spectra which we ascribe either inhomogeneous doping, arising diffusion of...
The precise prediction of hysteresis characteristics in nanocrystalline and amorphous strips is crucial for analyzing the electromagnetic properties high-frequency transformers. However, existing methods suffer from high cost, time consumption, inaccuracy, especially those under frequency non-sinusoidal excitation. For that, an analytical method with enhanced practicality effectiveness proposed predicting characteristics. Firstly, this paper uses Maxwell's equation to derive eddy current...
This paper has been withdrawn by the author(s) because some experimental results have not checked last two authors.
The structural properties of MgB2 superconductors have been analyzed by means convergent-beam electron diffraction, high-resolution transmission-electron microscopy, and theoretical simulations. crystal has identified to a hexagonal structure with the space group P6/mmm. Microstructural features MgB6 materials depend evidently upon synthesis pressures. Stacking faults grain boundaries in sample critical current density greater than 105A/cm2 extensively investigated.
We have experimentally studied the electronic structures of ternary glassy metals (${\mathrm{Cu}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Ni}}_{\mathit{x}}$${)}_{33}$${\mathrm{Zr}}_{67}$. The density states at Fermi level, N(0), has been estimated from measurements superconducting upper critical field. also measured valence band, using x-ray photoemission spectroscopy. found that structure is affected by Ni concentration in Also discussed are relationships between and properties,...
Abstract Sodium sulfonate‐terminated dendritic poly(ester‐amine) (SPEA) was synthesized by sulfonation of acrylic double bond‐terminated (APEA) with sodium hydrogen sulfite (NaHSO 3 ) in mixture diglycol and 2‐butanone under normal pressure. The structure SPEA characterized IR, 1 H‐NMR, elemental analysis. water‐soluble. 1.0–40.0% (mass) aqueous solutions appeared as dilatant fluid. When pH value varied from 1.5 to 12.0, the viscosity 1–5% changed very small, electric conductivity almost...
Scaling approaches to magnetization measurements are explored on a set of melt-textured (Y1−xPrx)Ba2Cu3O7−δ samples with different Pr concentrations. When normalized corresponding scaling parameters Hm, Mm, and Jm, respectively, magnetic hysteresis loops related critical current densities for temperatures from 4.5 75 K all found exhibit behavior. It is shown that low scaled field (h) region, this behavior can be described qualitatively well based an extended critical-state model. The...