A5039148300- Advanced Condensed Matter Physics
- Physics of Superconductivity and Magnetism
- Magnetic and transport properties of perovskites and related materials
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Crystal Structures and Properties
- Multiferroics and related materials
- Inorganic Fluorides and Related Compounds
- Perovskite Materials and Applications
- Topological Materials and Phenomena
- Quantum and electron transport phenomena
- Structural Behavior of Reinforced Concrete
- Iron-based superconductors research
- Magnetism in coordination complexes
- Magnetic properties of thin films
- Inorganic Chemistry and Materials
- Concrete Corrosion and Durability
- Electronic and Structural Properties of Oxides
- Plant and Fungal Species Descriptions
- Crystallography and molecular interactions
- Health Systems, Economic Evaluations, Quality of Life
- Advanced NMR Techniques and Applications
- Rare-earth and actinide compounds
- Nuclear materials and radiation effects
- Innovative concrete reinforcement materials
Sungkyunkwan University
2014-2025
Institute for Basic Science
2022-2025
Chung-Ang University
2008-2022
Princess Margaret Cancer Centre
2022
Science and Technology Facilities Council
2021
Rutherford Appleton Laboratory
2020-2021
Government of the Republic of Korea
2020
Samsung Medical Center
2019
Korea Advanced Institute of Science and Technology
1986-1999
We report significant intergrain magnetoresistance (IMR) in polycrystalline double perovskites of SrFe1−x(Mo or Re)xO3 at room temperature. Systematics the temperature dependence IMR indicates that observed large room-temperature SrFe1/2Mo1/2O3 originates from ferrimagnetic nature insulating grain boundaries as well half-metallicity this perovskite. Our results indicate a new avenue for spin-polarized tunneling junctions is to utilize interface layers with ferromagnetic coupling.
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....
We investigate the thermal evolution of magnetic correlations Co-based honeycomb lattice ${\mathrm{Na}}_{2}{\mathrm{Co}}_{2}{\mathrm{TeO}}_{6}$ with $^{23}\mathrm{Na}$ nuclear resonance and static susceptibility $\ensuremath{\chi}(T)$. The studied compound shows three-dimensional (3D) long-range ordering at ${T}_{\mathrm{N}}=26$ K. On cooling through ${T}^{*}\ensuremath{\approx}110$ K, a simple paramagnetic state undergoes crossover to correlated featuring power-law dependence spin-lattice...
We combine static magnetic susceptibility $\ensuremath{\chi}(T)$, muon-spin relaxation, and $^{1}\mathrm{H}$ nuclear resonance measurements to explore the spin dynamics in disordered-induced quantum liquid candidate ${\mathrm{H}}_{3}{\mathrm{LiIr}}_{2}{\mathrm{O}}_{6}$. Inverse Laplace transform analysis of spin-lattice relaxation rate $1/{T}_{1}$ enables us identify two characteristic temperatures ${T}_{\mathrm{g}}=110\phantom{\rule{0.16em}{0ex}}\mathrm{K}$...
We present magnetic susceptibility, dielectric constant, high-frequency electron spin resonance, $^{7}\mathrm{Li}$ nuclear and zero-field muon relaxation measurements of ${\mathrm{LiACr}}_{4}{\mathrm{O}}_{8}$ ($\mathrm{A}=\mathrm{Ga}$, In), towards realizing a breathing pyrochlore lattice. Unlike the uniform ${\mathrm{ZnCr}}_{2}{\mathrm{O}}_{4}$ lattice, both In Ga compounds feature two-stage symmetry breaking: magnetostructural phase transition with subsequent antiferromagnetic ordering....
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...
The magnetic ground states of the diluted $\ensuremath{\alpha}\ensuremath{-}{\mathrm{Ru}}_{1\ensuremath{-}x}{\mathrm{Ir}}_{x}{\mathrm{Cl}}_{3}$ are systematically investigated by magnetization, specific heat, and muon spin rotation measurements. Introduction moderate vacancies leads to a destabilization zigzag antiferromagnetic order towards short-range ordered state. It is remarkable that $x=0.2$ sample located near quantum critical point shows an extremely short correlation length...
The realization of quantum spin liquids on a triangular lattice magnet remains challenging due to quenched disorders present in real materials. Here, we report local-probe signatures spin-liquid-like excitations the structurally perfect antiferromagnet ${\mathrm{Na}}_{2}\mathrm{BaCo}{({\mathrm{PO}}_{4})}_{2}$. Our zero-field and longitudinal-field muon relaxation measurements reveal both spatially temporally correlated spins with no hint static magnetism down 80 mK, consistent liquid....
Kondo impurities provide a nontrivial probe to unravel the character of excitations quantum spin liquid. In S = 1/2 Kitaev model on honeycomb lattice, embedded in spin-liquid host can be screened by itinerant Majorana fermions via gauge-flux binding. Here, we report experimental signatures metallic-like screening at intermediate temperatures material α-RuCl3 with dilute Cr3+ (S 3/2) impurities. The static magnetic susceptibility, muon Knight shift, and spin-relaxation rate all feature...
We present a molecular orbital candidate <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mrow><a:msub><a:mi>Ba</a:mi><a:mn>4</a:mn></a:msub><a:msub><a:mi>TaMn</a:mi><a:mn>3</a:mn></a:msub><a:msub><a:mi mathvariant="normal">O</a:mi><a:mn>12</a:mn></a:msub></a:mrow></a:math> with face-sharing octahedra trimer, by comparing it related compound <c:math...
Frustrated magnets offer a plethora of exotic magnetic ground states, including quantum spin liquids (QSLs), in which enhanced fluctuations prevent long-range ordering the strongly correlated spins down to lowest temperature. Here we have investigated trimer based mixed valence hexagonal rhodate <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mrow><a:msub><a:mi>Ba</a:mi><a:mn>4</a:mn></a:msub><a:msub><a:mi>NbRh</a:mi><a:mn>3</a:mn></a:msub><a:msub><a:mi...
The subtle interplay between competing degrees of freedom offers an ideal route for the experimental realization emergent quantum and topological phenomena with exotic quasiparticle excitations in three-dimensional noncentrosymmetric frustrated magnets on a trillium lattice. Here, authors demonstrate coexistence magnetic states short-range spin correlations well above phase transition double lattice comprised Cr${}^{3+}$ ions decorated chiral network corner-shared equilateral triangular motifs.
We present an experimental investigation of the magnetic ground state in <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mrow><a:msub><a:mi>Ba</a:mi><a:mn>4</a:mn></a:msub><a:msub><a:mi>NbIr</a:mi><a:mn>3</a:mn></a:msub><a:msub><a:mi mathvariant="normal">O</a:mi><a:mn>12</a:mn></a:msub></a:mrow></a:math>, a fractional valent trimer iridate. X-ray absorption and photoemission spectroscopy show that Ir valence lies between <c:math...
To reveal the structure-property relationship in quasi-one-dimensional (1D) spin-chain system Ca$_3$ZnMnO$_6$, we present comprehensive results, combining basic physical characterizations such as muon spin relaxation/rotation ($\mu$SR), neutron powder diffraction (NPD), inelastic scattering (INS), and theoretical calculations. Ca$_3$ZnMnO$_6$ features a dominant intrachain coupling $J_1$ two distinct interchain interactions $J_2$ $J_3$, it undergoes antiferromagnetic ordering below...
We present an X-band and tunable high-frequency/high-field electron spin resonance (HF-ESR) study of single-crystalline Ca$_{10}$Cr$_{7}$O$_{28}$, which constitutes alternating antiferromagnetic ferromagnetic kagome bilayers. At high temperatures, a phonon-assisted relaxation process is evoked to account for the pronounced increase linewidth in exchange-narrowing regime ($k_{\rm B}T\gg J$). In contrast, at low temperatures B}T\lesssim J$), power-law behavior line narrowing observed. Our data...
A series of lithium metal selenites, Li6M(SeO3)4 (M = Co, Ni, and Cd) Li2Zn(SeO3)2, were synthesized by hydrothermal solid-state reactions. is composed Li+ cations, MO6 octahedra, SeO3 polyhedra, while Li2Zn(SeO3)2 consists Li+, Zn(Li)O4 tetrahedra, polyhedra. Isostructural Li6Co(SeO3)4 Li6Ni(SeO3)4 crystallize in the rhombohedral space group R3̅, forming a three-dimensional distorted cubic lattice. crystallizes orthorhombic Pbam reveals layered structure bc plane. Li6Cd(SeO3)4 revealing...
Antiferromagnetic spin fluctuations are the most promising candidate as pairing glue of high critical temperature (Tc) superconductivity in cuprates. However, many-body states and intertwined orders have made it difficult to determine how electrons couple with fluctuating spins form Cooper pairs. Recent experimental theoretical studies suggested fluctuation-driven quasiparticle band folding, but relationship between resultant Fermi pockets remains unclear. Here, using angle-resolved...
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...
Experimental observations were made for the shear capacity of reinforced concrete beams with carbon fiber-reinforced polymer rectangular stirrups (CFRPRS). In total, 12 tested under three-point loading. Each beam measured 1,400 mm long, 150 wide, and 250 deep. For comparative studies, different parameters considered: sectional shapes (circular CFRP stirrups), material types (steel CFRP), reinforcement ratios (0.0038 0.0096). All subjected to Test results indicated that CFRPRS could maintain...
Three new metal vanadium tellurites, MVTe2O8 (M = Al, Ga, and Mn) have been synthesized through standard solid-state hydrothermal reactions. Crystal structure analyses using X-ray diffraction reveal that the isostructural materials exhibit layered structures consisting of MO6, TeO4, VO4 polyhedra. The corner-sharing MO6 octahedra results in one-dimensional (1-D) zigzag chains are further interconnected by tetrameric Te4O12 units tetrahedra to complete a structure. Detailed structural...