A5034440925- Advanced Condensed Matter Physics
- Magnetic and transport properties of perovskites and related materials
- Physics of Superconductivity and Magnetism
- Topological Materials and Phenomena
- Electronic and Structural Properties of Oxides
- Multiferroics and related materials
- Graphene research and applications
- High-pressure geophysics and materials
- 2D Materials and Applications
- Quantum, superfluid, helium dynamics
- Iron-based superconductors research
- Magnetic Properties and Synthesis of Ferrites
Kangwon National University
2021-2025
Sungkyunkwan University
2023-2024
Indian Institute of Technology Madras
2016-2018
Two-dimensional honeycomb antiferromagnets are promising materials class for realizing Kitaev quantum spin liquids. The signature of these includes anisotropic bond-dependent magnetic responses and persistent fluctuations in paramagnetic regime. Here, we propose Cu3Co2SbO6 heterostructures as an intriguing candidate, wherein frustrated spins interact with optical excitons. First-principles Hamiltonian calculations in-plane critical fields suggest strong frustration dominant exchange...
van der Waals antiferromagnets with chemical formula M P X 3 ( = V, Mn, Fe, Co, Ni, Cd; S, Se) are superb platforms for exploring the fundamental properties of complex chalcogenides, revealing their structure-property relations and unraveling physics confinement. Pressure is extremely effective as an external stimulus, able to tune drive new states matter. In this review, we summarize experimental theoretical progress date special emphasis on structural, magnetic, optical family materials....
Abstract Kagome lattice has been actively studied for the possible realization of frustration-induced two-dimensional flat bands and a number correlation-induced phases. Currently, search kagome systems with nearly dispersionless band close to Fermi level is ongoing. Here, by combining theoretical experimental tools, we present Sc 3 Mn Al 7 Si 5 as novel almost-flat in vicinity level. Our magnetic susceptibility, 27 nuclear resonance, transport, optical conductivity measurements provide...
Spin-polarized density functional calculations, magnetization, and neutron diffraction (ND) measurements are carried out to investigate the magnetic exchange interactions strong correlation effects in Yb substituted inverse spinel nickel ferrite. In pristine form, compound is found be a mixed insulator under Zaanen-Sawatzky-Allen classification scheme as it features both charge transfer Mott mechanisms. Estimation of couplings reveals that octahedral-octahedral octahedral-tetrahedral...
Layered honeycomb cobaltates are predicted as promising for realizing the Kitaev quantum spin liquid, a many-body entangled ground state characterized by fractional excitations. However, they exhibit antiferromagnetic ordering at low temperatures, hindering expected state. We demonstrate that controlling trigonal distortion of CoO 6 octahedra is crucial to suppress order through enhancing frustration in layered cobaltates. Using heterostructure engineering on Cu 3 Co 2 SbO thin films, we...
We report the transition from robust ferromagnetism to a spin-glass state in nanoparticulate $\mathrm{L}{\mathrm{a}}_{0.7}\mathrm{S}{\mathrm{r}}_{0.3}\mathrm{Mn}{\mathrm{O}}_{3}$ through solid solution with $\mathrm{BaTi}{\mathrm{O}}_{3}$. The field- and temperature-dependent magnetization frequency-dependent ac magnetic susceptibility measurements strongly indicate existence of system, which is further confirmed memory effect measurements. breaking long-range ordering into short-range...
Abstract van der Waals solids are ideal platforms for the discovery of new states matter and emergent properties under external stimuli. Under pressure, complex chalcogenides like M PS 3 ( = Mn, Ni, Co, V) host sliding structural transitions, insulator-to-metal possibility an orbitally-selective Mott state, piezochromism, superconductivity. In this work, we bring together diamond anvil cell techniques, infrared Raman scattering spectroscopies, X-ray diffraction with a detailed symmetry...
Candidate materials for the Kitaev spin liquid phase have been intensively studied recently because of their potential applications in fault-tolerant quantum computing. Although most studies on done $4d$- and $5d$-based transition-metal compounds, there has a growing research interest Co-based quasi-two-dimensional honeycomb magnets, such as ${\mathrm{BaCo}}_{2}{({\mathrm{AsO}}_{4})}_{2}$ formation spin-orbit-entangled ${J}_{\mathrm{eff}}=1/2$ pseudospin moments at ${\mathrm{Co}}^{2+}$ sites...
Layered oxide heterostructures are the new route to tailor desired electronic and magnetic phases emerging from competing interactions involving strong correlation, orbital hopping, tunneling, lattice coupling phenomena. Here, we propose a half-metal/insulator superlattice that intrinsically forms spin-polarized two-dimensional electron gas (2DEG) following mechanism very different widely reported 2DEG at single perovskite polar interfaces. From density functional theory plus $U$ study on...
We have studied the electronic structure and magnetism of spin chain compounds Ca3ZnMnO6 Ca3ZnCoO6 using density functional theory with generalised gradient approximation (GGA). In agreement experiment our calculations reveal that high (HS) state for Mn(4+) ion low (LS) Co(4+) stabilize magnetic respective compounds. The exchange paths, calculated Nth order muffin-tin orbital downfolding method, shows dominant intra-chain interaction between ions (Mn, Co) is antiferromagnetic ferromagnetic...
An emerging phase of matter among the class topological materials is nodal line semimetals, possessing symmetry-protected one-dimensional gapless lines at (or close to) Fermi level in $k$ space. When dispersion weak, van Hove singularities generated by almost flat may be prone to instabilities introduced additional perturbations such as spin-orbit coupling or magnetism. Here, we study Cr-based ferromagnetic chalcospinel compound ${\mathrm{CuCr}}_{2}{\mathrm{Se}}_{4}$ (CCS) via...
Co-based honeycomb magnets have been actively studied recently for the potential realization of emergent quantum magnetism therein such as Kitaev spin liquid. Here we employ density functional and dynamical mean-field theory methods to examine a family magnet candidates BaCo2(XO4)2 (X = P, As, Sb), where compound with X Sb being not synthesized yet. Our study confirms formation Mott insulating phase Jeff 1/2 moments at Co2+ sites despite presence sizable amount trigonal crystal field in all...
Layered honeycomb magnets with strong atomic spin–orbit coupling at transition metal sites have been intensively studied for the search of Kitaev magnetism and resulting non-Abelian braiding statistics. α-RuCl3 has most promising candidate, there several reports on realization sibling compounds α-RuBr3 α-RuI3 same crystal structure. Here, we investigate correlated electronic structures by employing first-principles dynamical mean-field theory. Our result provides a valuable insight into...
Kagome lattice has been actively studied for the possible realization of frustration-induced two-dimensional flat bands and a number correlation-induced phases. Currently, search kagome systems with nearly dispersionless band close to Fermi level is ongoing. Here, by combining theoretical experimental tools, we present Sc$_3$Mn$_3$Al$_7$Si$_5$ as novel almost-flat in vicinity level. Our magnetic susceptibility, $^{27}$Al nuclear resonance, transport, optical conductivity measurements provide...
<title>Abstract</title> Kagome lattice has been actively studied for the possible realization of frustration-induced two-dimensional flat bands and a number correlation-induced phases. Currently, search kagome systems with nearly dispersionless band close to Fermi level is ongoing. Here, by combining theoretical experimental tools, we present Sc<sub>3</sub>Mn<sub>3</sub>Al<sub>7</sub>Si<sub>5</sub> as novel almost-flat in vicinity level. Our magnetic susceptibility, <sup>27</sup>Al nuclear...