Noncubic local distortions and spin-orbit excitons in K2 IrCl6
DC Field | Value | Language |
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dc.contributor.author | Lee, Seungyeol | - |
dc.contributor.author | Kim, Beom Hyun | - |
dc.contributor.author | Seong, Maeng-Je | - |
dc.contributor.author | Choi, Kwang-Yong | - |
dc.date.accessioned | 2022-06-24T01:40:26Z | - |
dc.date.available | 2022-06-24T01:40:26Z | - |
dc.date.issued | 2022-05 | - |
dc.identifier.issn | 2469-9950 | - |
dc.identifier.issn | 2469-9969 | - |
dc.identifier.uri | https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/58308 | - |
dc.description.abstract | The cubic antifluorite K2IrCl6 has recently garnered renewed attention due to its relevance to Kitaev magnetism. Combining Raman spectroscopy with numerical calculations, we investigate its electronic structure and ensuing low-lying excitations as well as lattice instabilities. For temperatures below T∗≈180 K, we observe several lattice anomalies: (i) a gradual appearance of the symmetry-forbidden phonons; (ii) a central-mode-like excitation; and (iii) a soft-mode-like behavior of the Γ5+ mode involving vibrations of the K+ ion relative to the Cl- ion. All these features indicate the occurrence of local noncubic distortions. At high energies, we observe spin-orbit (SO) excitons made of five peaks at ω=0.62-0.79 eV as well as a weak electronic excitation at ω=0.12-0.86 eV. Our numerical calculations reproduce their spectral energy and shape with the electronic parameters: SO coupling λ=465 meV; Hund's coupling JH=300 meV; tetragonal distortion strength Δt=30 meV and on-site Coulomb interaction U=2.2 eV. The multiple SO excitons are interpreted in terms of bounded SO excitons of the |jeff=32,±12) states arising from the coupling between the SO excitons and electron-hole excitations. Our results showcase that K2IrCl6 is on the brink of a structural phase transition. © 2022 American Physical Society. | - |
dc.language | 영어 | - |
dc.language.iso | ENG | - |
dc.publisher | American Physical Society | - |
dc.title | Noncubic local distortions and spin-orbit excitons in K2 IrCl6 | - |
dc.type | Article | - |
dc.identifier.doi | 10.1103/PhysRevB.105.184433 | - |
dc.identifier.bibliographicCitation | Physical Review B, v.105, no.18 | - |
dc.description.isOpenAccess | N | - |
dc.identifier.wosid | 000811549600010 | - |
dc.identifier.scopusid | 2-s2.0-85131353142 | - |
dc.citation.number | 18 | - |
dc.citation.title | Physical Review B | - |
dc.citation.volume | 105 | - |
dc.type.docType | Article | - |
dc.publisher.location | 미국 | - |
dc.subject.keywordPlus | ANTIFERROMAGNETIC SALTS | - |
dc.subject.keywordPlus | EXCHANGE INTERACTIONS | - |
dc.subject.keywordPlus | PHASE-TRANSITIONS | - |
dc.subject.keywordPlus | IRIDIUM | - |
dc.relation.journalResearchArea | Materials Science | - |
dc.relation.journalResearchArea | Physics | - |
dc.relation.journalWebOfScienceCategory | Materials Science, Multidisciplinary | - |
dc.relation.journalWebOfScienceCategory | Physics, Applied | - |
dc.relation.journalWebOfScienceCategory | Physics, Condensed Matter | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
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