A5101580579- Advanced Condensed Matter Physics
- Physics of Superconductivity and Magnetism
- Magnetic and transport properties of perovskites and related materials
- Multiferroics and related materials
- Iron-based superconductors research
- Plant Micronutrient Interactions and Effects
- Aerogels and thermal insulation
- Nuclear materials and radiation effects
- Rare-earth and actinide compounds
- Electronic and Structural Properties of Oxides
- Topological Materials and Phenomena
- Inorganic Fluorides and Related Compounds
- ZnO doping and properties
- Magnetic and Electromagnetic Effects
- Advanced Sensor and Energy Harvesting Materials
- Magnetic Properties of Alloys
- Electrochemical Analysis and Applications
- High-Temperature Coating Behaviors
- Perovskite Materials and Applications
- Semiconductor materials and interfaces
- Gold and Silver Nanoparticles Synthesis and Applications
- Insect Utilization and Effects
- Surface Modification and Superhydrophobicity
- Marine and Coastal Research
- Protein Hydrolysis and Bioactive Peptides
Chung-Ang University
2018-2024
Sungkyunkwan University
2022-2024
TRIUMF
2021-2023
Korea University
2019-2020
Catholic University of Korea
2012-2018
RIKEN Nishina Center
2018
Bucheon St. Mary's Hospital
2016
Ewha Womans University Medical Center
2009
A comparative characterization of proteins from three edible insects—Tenebrio molitor (mealworm) larvae, Gryllus bimaculatus (cricket), and Bombyx mori (silkworm) pupae—was performed in this study. Proteins were extracted insects their hydrolysates prepared through enzymatic hydrolysis with commercial enzymes (Flavourzyme: 12%; Alcalase: 3%). Solubility was significantly higher following hydrolysis, while foamability lower compared to those the protein control. Angiotensin-converting enzyme...
We report on magnetization M(H), dc and ac magnetic susceptibility χ(T), specific heat Cm(T) muon spin relaxation (μSR) measurements of the Kitaev honeycomb iridate Cu2IrO3 with quenched disorder. In spite chemical disorders, we find no indication glass down to 260 mK from μSR data. Furthermore, a persistent dynamics observed by zero-field evidences an absence static magnetism. The remarkable observation is scaling relation χ[H,T] M[H,T] in H/T exponent α=0.26–0.28, expected bond randomness....
dc and ac magnetic susceptibility, magnetization, specific heat, Raman scattering measurements are combined to probe low-lying spin excitations in $\ensuremath{\alpha}$-${\mathrm{Ru}}_{1\ensuremath{-}x}{\mathrm{Ir}}_{x}{\mathrm{Cl}}_{3}$ ($x\ensuremath{\approx}0.2$), which realizes a disordered liquid. At intermediate energies ($\ensuremath{\hbar}\ensuremath{\omega}>3\text{ }\text{ }\mathrm{meV}$), spectroscopy evidences linearly $\ensuremath{\omega}$-dependent Majorana-like excitations,...
We present the magnetic, thermodynamic, and muon spin relaxation (<a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mrow><a:mi>μ</a:mi><a:mi>SR</a:mi></a:mrow></a:math>) results of dimer-based triangular antiferromagnet <b:math xmlns:b="http://www.w3.org/1998/Math/MathML"><b:mrow><b:msub><b:mi>Ba</b:mi><b:mn>6</b:mn></b:msub><b:msub><b:mi...
We report on thermodynamic, magnetization, and muon spin relaxation measurements of the strong spin-orbit coupled iridate ${\mathrm{Ba}}_{3}{\mathrm{IrTi}}_{2}{\mathrm{O}}_{9}$, which constitutes a distinct frustration motif made up mixture edge- corner-sharing triangles. In spite antiferromagnetic exchange interaction order 100 K, we find no hint for long-range magnetic down to 23 mK. The specific heat data unveil $T$-linear $T$-squared dependences at low temperatures below 1 K. At...
The structural identity of the biomineralized iron core nanoparticles in Helicobacter pylori ferritins (Hpf's) has been determined by employing soft x-ray absorption spectroscopy and magnetic circular dichroism. Valence states Fe ions are nearly trivalent all Hpf's, indicating that amount magnetite (Fe3O4) is negligible. With increasing filling ions, local configurations Fe3+ change from mixture tetrahedral octahedral symmetries to symmetry. These results demonstrate biomineralization...
Abstract Interaction between electrons has long been a focused topic in condensed-matter physics since it led to the discoveries of astonishing phenomena, for example, high- T c superconductivity and colossal magnetoresistance (CMR) strongly-correlated materials. In study perovskite oxides, Nb-doped SrTiO 3 (Nb:SrTiO ) workhorse not only as conducting substrate, but also host possessing high carrier mobility. this work, we report observations large linear (LMR) metal-to-insulator transition...
We have studied the superconducting properties of isostructural ternary noncentrosymmetric superconductors $\mathrm{Ta}X\mathrm{Si}$ $(X=\mathrm{Re}, \mathrm{Ru})$ with help muon spin rotation/relaxation $(\ensuremath{\mu}\mathrm{SR})$ and density functional theory calculations. Our transverse-field $\ensuremath{\mu}\mathrm{SR}$ measurements indicate isotropic $s$-wave superconductivity in TaReSi multigap TaRuSi. Zero-field measurements, highly sensitive to very small magnetic fields, find...
We present the synthesis and physical properties of a breathing pyrochlore magnet ${\mathrm{CuAlCr}}_{4}{\mathrm{S}}_{8}$ via synchrotron x-ray diffraction, magnetization under ambient applied hydrostatic pressure, heat capacity, muon spin relaxation/rotation measurements. exhibits positive thermal expansion with concave upward temperature dependence. observed sharp antiferromagnetic ordering transition purely magnetic nature at 20 K, which shifts by as much 3.2 K on application 600 MPa...
We combine thermodynamic, electron spin resonance (ESR), and muon spin-relaxation ($\mathrm{\ensuremath{\mu}}\mathrm{SR}$) measurements with density functional theory (DFT) classical Monte Carlo calculations toward understanding a disorder-driven behavior of the 3D coupled frustrated cubic lattice $\mathrm{Lu}{}_{3}\mathrm{Sb}{}_{3}\mathrm{Mn}{}_{2}{\mathrm{O}}_{14}$ $s=5/2$. The based on exchange interactions extracted from DFT predict that undergoes transition to magnetic ordering. In...
We report ${}^{11}\mathrm{B}$ nuclear magnetic resonance (NMR) and zero-field muon spin relaxation (ZF-$\ensuremath{\mu}\mathrm{SR})$ measurements of the anisotropic tetramer system ${\mathrm{CdCu}}_{2}\phantom{\rule{0.16em}{0ex}}({\mathrm{BO}}_{3}){\phantom{\rule{0.16em}{0ex}}}_{2}$, which consists strongly interacting Cu(1) dimers weakly coupled nonfrustrated Cu(2) spins. Long-range order is observed at ${T}_{N}=9.8$ K by a critical divergence spin-lattice rate $1/{T}_{1}$ an appearance...
The $B$-site ordered double perovskites ${\mathrm{Sr}}_{2}\mathrm{Cu}({\mathrm{Te}}_{1\ensuremath{-}x}{\mathrm{W}}_{x}){\mathrm{O}}_{6}$ provide an excellent arena for investigating exotic phases expected the ${J}_{1}\text{\ensuremath{-}}{J}_{2}$ square-lattice Heisenberg antiferromagnet. Here, combining magnetic susceptibility and specific-heat measurements with electron spin resonance (ESR) muon rotation/relaxation $(\ensuremath{\mu}\mathrm{SR})$ techniques, we explore a spin-liquid-like...
We have investigated the nature of short-range magnetic phase region ${\mathrm{Sr}}_{2\ensuremath{-}x}{\mathrm{La}}_{x}{\mathrm{IrO}}_{4}$ ($0\ensuremath{\le}x\ensuremath{\le}0.14$). This so-called spin-orbit Mott insulator's predicted transition to superconductivity with electron doping has remained elusive. Instead, magnetism prevails over an extensive range up La solubility limit. find evidence for quantum critical-like fluctuations phase, in both a scaling relation ac susceptibility...
Spin dynamics of the staircase kagome lattice ${\mathrm{PbCu}}_{3}{\mathrm{TeO}}_{7}$ was investigated by static magnetic susceptibility $\ensuremath{\chi}(T)$, high-field magnetization $M(H)$, and muon spin rotation/relaxation $(\ensuremath{\mu}\mathrm{SR})$ measurements. $\ensuremath{\chi}(T)$ displays a sub-Curie power-law behavior $\ensuremath{\chi}(T)\ensuremath{\sim}{T}^{\ensuremath{-}\ensuremath{\alpha}}$ with changing exponent from $\ensuremath{\alpha}=0.5$ to 0.3 crossing...
We present muon spin relaxation ($\ensuremath{\mu}\mathrm{SR}$) measurements of the $S=3/2$ undistorted triangular lattice established in ${\mathrm{RbAg}}_{2}\mathrm{Cr}{[{\mathrm{VO}}_{4}]}_{2}$. The zero- (ZF) and longitudinal-field $\ensuremath{\mu}\mathrm{SR}$ spectra evidence absence freezing long-range magnetic ordering down to $T=25$ mK, supporting formation a dynamic ground state. Noticeably, we observe an anomalous temperature dependence ZF rate ${\ensuremath{\lambda}}_{Z}F(T)$,...
Magnetic properties of a one-dimensional frustrated quantum spin system Rb2Cu2Mo3O12 is investigated by the muon relaxation (muSR) technique. Although this shows an incommensurate correlation in neutron scattering, it has not yet been determined whether ground state reaches to nonmagnetic spin-singlet or not. In study, our zero-field (ZF) muSR result undoubtedly reveals state, which establishes formation combination previous scattering study. Furthermore, we found that internal field...
We report (23)Na nuclear magnetic resonance (NMR) and zero-field (ZF) longitudinal-field (LF) muon spin relaxation (μSR) measurements of the depleted hyperkagome compounds Na(4-x)Ir3O8 (x = 0.3 0.7), which undergo an insulator-semimetal transition as a function x. The spin-lattice rates, T1(-1), follow T(2.5) power law behavior at accessible temperatures T 120-350 K. A substantial temperature dependence T1(-1) indicates presence gapped excitations elevated through to semimetallic phase....
We report magnetic susceptibility, high-field magnetization, muon spin relaxation, and electron resonance measurements of the breathing pyrochlore antiferromagnets ${\mathrm{LiGa}}_{1\ensuremath{-}x}{\mathrm{In}}_{x}{\mathrm{Cr}}_{4}{\mathrm{O}}_{8}$ ($x=0.2$, 0.5). Unlike previously proposed spin-glass-like phase for $0.1<x<0.75$, we find no signature glassiness segregation in both $x=0.2$ 0.5 compounds. Instead, identify a two-step transition with partial freezing at...
Valence-skipped superconductors are natural candidates for unconventional superconductivity because they can exhibit a negative effective, attractive interaction electron pairing. This work reports comprehensive x-ray diffraction, magnetization, specific heat, and muon spin rotation relaxation measurements ($\ensuremath{\mu}\mathrm{SR}$) on the valence-skipped compound ${\mathrm{AgSnSe}}_{2}$. The temperature dependences of electronic heat $[{C}_{\mathrm{el}}(T)]$ upper critical field...