A5101950342- Physics of Superconductivity and Magnetism
- NMR spectroscopy and applications
- Advanced Neuroimaging Techniques and Applications
- Superconductivity in MgB2 and Alloys
- Advanced MRI Techniques and Applications
- Theoretical and Computational Physics
- Magnetic properties of thin films
- Superconducting Materials and Applications
- Material Dynamics and Properties
- Electrochemical Analysis and Applications
- Advanced Electrical Measurement Techniques
- Electrocatalysts for Energy Conversion
- Chemical and Physical Properties of Materials
- Soil and Unsaturated Flow
- Advanced Condensed Matter Physics
- Complex Systems and Time Series Analysis
- Magnetic confinement fusion research
- Advanced NMR Techniques and Applications
- Iron-based superconductors research
- Optical and Acousto-Optic Technologies
- Optical Polarization and Ellipsometry
- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- High-pressure geophysics and materials
Changwon National University
2024
Ulsan National Institute of Science and Technology
2011
Schlumberger (United States)
2001-2009
Seoul National University
2007
The Ohio State University
1996-1997
Stanford University
1992-1994
Tel Aviv University
1992
The Korea Invisible Mass Search (KIMS) experiment presents new limits on the weakly interacting massive particle (WIMP)-nucleon cross section using data from an exposure of 3409 kg·d taken with low-background CsI(Tl) crystals at Yangyang Underground Laboratory. most stringent limit spin-dependent interaction for a pure proton case is obtained. DAMA signal region both spin-independent and interactions WIMP masses greater than 20 GeV/c2 excluded by single crystal scintillators.Received 3 April...
We studied flux lattice melting in a model high-${\mathit{T}}_{\mathit{c}}$ superconductor by Monte Carlo simulation terms of vortex variables. identify two curves the B-T phase diagram and evaluate density-dependent Lindemann criterion number for melting. also observe that transition temperature shifts downward toward two-dimensional limit as density lines increases. Although does not change, significant difference shear modulus is observed when cutting or reconnection allowed.
We present measurements of c-axis transport in single-crystal Bi2Sr2CaCu2O8 which suggest that decoupling the superconducting CuO2 layers occurs via a continuous crossover this material. discuss process and supplement our arguments with Monte Carlo simulations vortex fluctuations. Our data two regimes coupling process. The first is establishment macroscopic correlation length c-direction associated sharp drop resistivity. second stage finite critical current direction spans rest temperature...
Complex structures often consist of many interconnected or “coupled” simpler regions. The problem frequently arises determining the geometry these individual subregions within larger structure. We consider a simple model to argue that high eigenmodes diffusion equation can be used probe their geometry. find for wide range coupling, certain preferentially remain particular subregion, thereby allowing association corresponding eigenvalue with subregion. discuss an application results...
Recently, structural analysis related to stress and strain has become increasingly important in the design of high-field, high-temperature superconducting (HTS) magnets using Rare-Earth Barium Copper Oxide (REBCO) tapes. Superconducting can be subjected compressive loads due various factors such as winding tension, Lorentz force, thermal contraction. Deformation is typically predicted based on material properties REBCO However, deformation behavior stacking direction under conditions,...
To study relaxation dynamics of the two-dimensional $\mathrm{XY}$ gauge glass, we integrate directly equations motion and investigate energy function. As usual, it decays exponentially at high temperatures; low but nonzero temperatures, is found to exhibit an algebraic relaxation. We compute time $\ensuremath{\tau}$ as a function temperature $T$ find that rapid increase temperatures well described by $\ensuremath{\tau}\ensuremath{\sim}(T\ensuremath{-}{T}_{g}{)}^{\ensuremath{-}b}$ with...
Recent neutron data on the disappearance of long-range order in vortex lattice BSCCO at fields 1 kGauss is interpreted terms results a monte carlo simulation thermodynamics pure system. We show that consistent with disorder-driven phase transition from crystal low to glass higher fields.
We evaluated the doping effects of carbohydrate (malic acid, C4H6O5), from 0wt% to 30wt% total MgB2, on phase, lattice parameters, critical temperature, resistivity, and upper field MgB2 superconductor. The parameters calculated show a large decrease in a-axis for + C4H6O5 samples, but no change c-axis. This is an indication carbon substitution into boron coming C4H6O5, resulting enhancement current density, field. Specifically, density value 25000 Acm2 at 5 K 8 T sample higher than that...