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Pressure-induced collapse of the spin-orbital Mott state in the hyperhoneycomb iridate β-Li2IrO3
https://repo.qst.go.jp/records/74807
https://repo.qst.go.jp/records/748076a48851b-f6b8-4f72-93c8-35f9056d3197
| Item type | 学術雑誌論文 / Journal Article(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2018-08-16 | |||||
| タイトル | ||||||
| タイトル | Pressure-induced collapse of the spin-orbital Mott state in the hyperhoneycomb iridate β-Li2IrO3 | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
| 資源タイプ | journal article | |||||
| アクセス権 | ||||||
| アクセス権 | metadata only access | |||||
| アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
| 著者 |
Takayama, T.
× Takayama, T.× Krajewska, A.× S. Gibbs, A.× N. Yaresko, A.× Ishii, H.× Yamaoka, H.× Ishii, K.× Hiraoka, N.× P. Funnell, N.× L. Bull, C.× Takagi, H.× Ishii, Kenji |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Hyperhoneycomb iridate β-Li2IrO3 is a three-dimensional analog of two-dimensional honeycomb iridates, such as α-Li2IrO3, which recently appeared as another playground for the physics of Kitaev-type spin liquid. β-Li2IrO3 shows a noncollinear spiral ordering of spin-orbital-entangled Jeff = 1/2 moments at low temperatures below 38 K, which is known to be suppressed under a pressure of ∼2 GPa. In addition, a structural transition is observed at PS ∼ 4 GPa at room temperature. Using the neutron powder diffraction technique, the crystal structure in the high-pressure phase of β-Li2IrO3 above PS was refined, which indicates the formation of Ir2 dimers on the zigzag chains, with an Ir-Ir distance of ∼2.66 Å, even shorter than that of metallic Ir. We argue that the strong dimerization stabilizes the bonding molecular-orbital state comprising the two local dzx orbitals in the Ir-O2-Ir bond plane, which conflicts with the equal superposition of dxy, dyz, and dzx orbitals in the Jeff = 1/2 wave function produced by strong spin-orbit coupling. The results of resonant inelastic x-ray scattering measurements and the electronic structure calculations are fully consistent with the collapse of the Jeff = 1/2 state. The competition between the spin-orbital-entangled Jeff = 1/2 state and molecular-orbital formation is most likely universal in honeycomb-based Kitaev materials. | |||||
| 書誌情報 |
Physical Review B 巻 99, 号 12, p. 125127-1-125127-7, 発行日 2019-03 |
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| 出版者 | ||||||
| 出版者 | Americal Physical Society | |||||
| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 2469-9950 | |||||
| DOI | ||||||
| 識別子タイプ | DOI | |||||
| 関連識別子 | 10.1103/PhysRevB.99.125127 | |||||
| 関連サイト | ||||||
| 識別子タイプ | URI | |||||
| 関連識別子 | https://journals.aps.org/prb/abstract/10.1103/PhysRevB.99.125127 | |||||
