A5047078248- Physics of Superconductivity and Magnetism
- Iron-based superconductors research
- Nuclear Materials and Properties
- Fusion materials and technologies
- Magnetic and transport properties of perovskites and related materials
- Advanced ceramic materials synthesis
- Superconductivity in MgB2 and Alloys
- Surface and Thin Film Phenomena
- Silicon Carbide Semiconductor Technologies
- Ion-surface interactions and analysis
- Aluminum Alloys Composites Properties
- Advanced materials and composites
- Metal and Thin Film Mechanics
- Rare-earth and actinide compounds
- Advanced Condensed Matter Physics
- Magnetic properties of thin films
- High-pressure geophysics and materials
- Theoretical and Computational Physics
- Boron and Carbon Nanomaterials Research
- Microstructure and mechanical properties
- Silicon and Solar Cell Technologies
- Electronic and Structural Properties of Oxides
- Graphite, nuclear technology, radiation studies
- X-ray Spectroscopy and Fluorescence Analysis
- Thin-Film Transistor Technologies
Hengyang Normal University
2023
Chinese Academy of Sciences
2015-2020
Shanghai Institute of Applied Physics
2015-2020
Argonne National Laboratory
2006-2014
Nanjing University
2009-2014
Collaborative Innovation Center of Advanced Microstructures
2009-2014
National Laboratory of Solid State Microstructures
2012
Stockholm University
2009
AlbaNova
2009
University of Notre Dame
2008-2009
We report the results of highly sensitive transmission X-ray scattering measurements performed at Advanced Photon Source, Argonne National Laboratory, on nearly fully dense high-purity amorphous-silicon (a-Si) samples for purpose determining their degree hyperuniformity. A perfectly hyperuniform structure has complete suppression infinite-wavelength density fluctuations, or, equivalently, factor S ( q →0) = 0; smaller value (0), higher Annealing was observed to increase hyperuniformity in...
Low-precision training is considered an effective strategy for reducing both and downstream inference costs. Previous scaling laws precision mainly focus on integer quantization, which pay less attention to the constituents in floating-point quantization thus cannot well fit LLM losses this scenario. In contrast, while more commonly implemented production, research it has been relatively superficial. paper, we thoroughly explore effects of targets, exponent bits, mantissa calculation...
We present a thermodynamic study of the phase diagram single-crystal ${\text{Ba}}_{1\ensuremath{-}x}{\text{K}}_{x}{\text{Fe}}_{2}{\text{As}}_{2}$ using specific-heat measurements. In zero-magnetic field clear step in heat capacity $\ensuremath{\Delta}C/{T}_{c}=0.1\text{ }\text{J}/\text{mol}\text{ }{\text{K}}^{2}$ is observed at ${T}_{c}\ensuremath{\approx}34.6\text{ }\text{K}$ for sample with $x=0.4$. This material characterized by extraordinarily high slopes upper critical...
We present heat-capacity measurements of the upper critical fields single-crystal ${\text{NdFeAsO}}_{1\ensuremath{-}x}{\text{F}}_{x}$. In zero-magnetic field a clear step in heat capacity is observed at ${T}_{c}\ensuremath{\approx}47\text{ }\text{K}$. applied perpendicular to FeAs layers broadens significantly whereas for in-plane orientation effects are small. This behavior reminiscent ${\text{CuO}}_{2}$-high-${T}_{c}$ superconductors and manifestation pronounced fluctuation effects. Using...
Thorium monocarbide (ThC) as a potential fuel for next generation nuclear reactor has been subjected to its structural stability investigation under high pressure, and so far no one reported the observation of structure phase transition induced by pressure. Here, utilizing synchrotron X-ray diffraction technique, we first time, experimentally revealed ThC from B1 P4/nmm at pressure ~58 GPa ambient temperature. A volume collapse 10.2% was estimated during transition. modulus 147 obtained...
Abstract Thorium-carbon systems have been thought as promising nuclear fuel for Generation IV reactors which require high-burnup and safe fuel. Existing knowledge on thorium carbides under extreme condition remains insufficient some is controversial due to limited studies. Here we systematically predict all stable structures of dicarbide (ThC 2 ) the pressure ranging from ambient 300 GPa by merging ab initio total energy calculations unbiased structure searching method, are in sequence C2/c,...
We have developed a membrane-based microcalorimeter for general measurements of heat capacity and latent using combination ac steady-state relaxation methods. The differential calorimeter is designed sub-microgram samples studied over wide range temperatures magnetic fields. device based on free-standing silicon nitride membranes 150 nm thickness onto which thin film heaters temperature sensors are fabricated. While production-line fabrication may benefit from back-etching as final step, it...
The structure and size of SiC nanoparticles were studied by different characterization methods including small angle X-ray scattering (SAXS), transmission electron microscope (TEM), diffraction (XRD). results showed that particle distributions determined respectively from SAXS TEM are comparable follow the log-normal function. distribution particles is between 10 to 100 nm with most them being in range 20–50 nm. average around 42 XRD identifies phase suggests single crystalline domain be 21...
Abstract Accurately measuring Rn-220 is crucial for evaluating natural radiation exposure. For the large volume of normal scintillation cell, detection efficiencies different energy α particles decayed from Rn-222, and their progeny are varied. To address this, two systems low-pressure cell were designed to make shortest range with minimum Rn-222 longer than longest distance between any points in by reducing air pressure. Thus, same. The efficiency can be obtained standard radon chamber,...
High purity, detwinned ${\text{YBa}}_{2}{\text{Cu}}_{3}{\text{O}}_{7\ensuremath{-}x}$ single crystals were locally irradiated with a stripe pattern using microcollimated 250 MeV Au ion beam to dose matching field of ${B}_{\ensuremath{\Phi}}=4\text{ }\text{T}$. Electron microscopy measurements the cross section crystal indicate presence nanometer columnar defects confined surface layer (blind holes) and an ensemble ancillary in bulk crystal. We present systematic studies effects blind hole...
The phase transition of vortex matter from solid to liquid was studied in iron-based superconductors. Based on the traditional glass theory, we have examined magnetoresistivity data superconductors using our extended thermal activation model: <TEX>$\rho(B,T)=\rho((T-T_g(B))/(T_c(0)-T_g(B)))^{v(z-1)}$</TEX>. We predict that magnetic field-dependent area S + <TEX>$S_0$</TEX> which integrates <TEX>$\rho$</TEX> with T is proportional <TEX>$B^{\beta}$</TEX>, where <TEX>${\beta}$</TEX> exponent....