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Weak-coupling Mean-field Theory of Magnetic Properties of NiGa2S4
https://repo.qst.go.jp/records/78448
https://repo.qst.go.jp/records/78448803d4697-e8a5-45ff-b2c7-7ff7a85c4ace
| Item type | 学術雑誌論文 / Journal Article(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2020-01-16 | |||||
| タイトル | ||||||
| タイトル | Weak-coupling Mean-field Theory of Magnetic Properties of NiGa2S4 | |||||
| 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 |
Nomura, Takuji
× Nomura, Takuji× Yamamoto, Yuji× Yoshii, Kenji× Takuji, Nomura |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | We report a mean-field theoretical study of a triangular lattice magnet NiGa2S4. Specifically, spiral mean-field theory is applied to a 17-band d–p model constructed from the maximally localized Wannier functions. Our itinerant-model approach shows that the most stable spiral magnetic state has an ordering vector near Q=(0.15,0.15,0), consistent with neutron scattering experiments, when we assume the Ni-site Coulomb interaction is not so strong (U ≈ 2 eV). To map onto a classical Heisenberg spin model, we estimate spin exchange interactions from the mean-field results, and find that the nearest-neighbor exchange is ferromagnetic and the largest (larger than the third nearest-neighbor exchange, in contrast to early studies). We also calculate the dynamical spin correlation function S(q,ω), using the same model within the random-phase approximation (RPA). Calculated S(q,ω) has a spectral structure quite different from that of conventional spin-wave excitations. | |||||
| 書誌情報 |
Journal of the Physical Society of Japan 巻 89, 号 2, p. 024704, 発行日 2020-01 |
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| 出版者 | ||||||
| 出版者 | The Physical Society of Japan | |||||
| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 0031-9015 | |||||
| DOI | ||||||
| 識別子タイプ | DOI | |||||
| 関連識別子 | 10.7566/JPSJ.89.024704 | |||||
| 関連サイト | ||||||
| 識別子タイプ | URI | |||||
| 関連識別子 | https://journals.jps.jp/doi/10.7566/JPSJ.89.024704 | |||||
