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Scaling Theory for Critical Phenomena in Coupled Magnetic Systems: Critical Exponents of πd Antiferromagnets
https://hiroshima.repo.nii.ac.jp/records/2007616
https://hiroshima.repo.nii.ac.jp/records/2007616e71c5721-dcc2-4ae2-be0e-1e683b6a6d38
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
JPSJ_89_043001.pdf (66.3 KB)
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| Item type | デフォルトアイテムタイプ_（フル）(1) | |||||||
|---|---|---|---|---|---|---|---|---|
| 公開日 | 2023-03-18 | |||||||
| タイトル | ||||||||
| タイトル | Scaling Theory for Critical Phenomena in Coupled Magnetic Systems: Critical Exponents of πd Antiferromagnets | |||||||
| 言語 | en | |||||||
| 作成者 |
Shimahara, Hiroshi
× Shimahara, Hiroshi
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| アクセス権 | ||||||||
| アクセス権 | open access | |||||||
| アクセス権URI | http://purl.org/coar/access_right/c_abf2 | |||||||
| 権利情報 | ||||||||
| 権利情報 | Copyright (c) 2020 The Physical Society of Japan | |||||||
| 権利情報 | ||||||||
| 権利情報 | This is not the published version. Please cite only the published version. この論文は出版社版ではありません。引用の際には出版社版をご確認、ご利用ください。 | |||||||
| 内容記述 | ||||||||
| 内容記述 | The scaling theory for critical phenomena is extended to coupled magnetic systems that consist of two subsystems, and some extended relations of critical exponents are derived. It is shown that the extended theory practically reduces to the conventional scaling theory in ferromagnets and in non-ferromagnetic systems with β1 = β2; however, the extended form of the theory can be relevant otherwise, where β1 and β2 are exponents of the order parameters in subsystems 1 and 2, respectively. The theory is applied to a model of the organic πd antiferromagnet λ-(BETS)2FeCl4, which contains π- and d-spin subsystems, where BETS stands for bis(ethylenedithio)tetraselenafulvalene. It is shown that an effective Hamiltonian for the π spins is reduced to the two-dimensional Ising model in the vicinity of the critical temperature Tc. This supports a conjecture from a recent experimental observation. Consequently, β1 = 1/8 is obtained, where subsystems 1 and 2 correspond to the π- and d-spin systems, respectively. Additional relations α = 1 − β1 − β2 and β1 = β2 ≡ β are derived from specific features of the λ-(BETS)2FeCl4 system. These relations result in α = 1 − 2β, which was previously obtained in a free-energy functional model. Critical exponents below Tc are obtained as α = 3/4, β = 1/8, γ = 1, δ = 9, ψ = 1/5, and ν = 5/8. The value of α is close to a recent experimental result of α = 0.77 in λ-(BETS)2FeCl4. | |||||||
| 言語 | en | |||||||
| 出版者 | ||||||||
| 出版者 | The Physical Society of Japan | |||||||
| 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 | |||||||
| 出版タイプ | ||||||||
| 出版タイプ | AO | |||||||
| 出版タイプResource | http://purl.org/coar/version/c_b1a7d7d4d402bcce | |||||||
| 関連情報 | ||||||||
| 識別子タイプ | DOI | |||||||
| 関連識別子 | 10.7566/JPSJ.89.043001 | |||||||
| 関連情報 | ||||||||
| 識別子タイプ | DOI | |||||||
| 関連識別子 | https://doi.org/10.7566/JPSJ.89.043001 | |||||||
| 収録物識別子 | ||||||||
| 収録物識別子タイプ | ISSN | |||||||
| 収録物識別子 | 0031-9015 | |||||||
| 開始ページ | ||||||||
| 開始ページ | 043001-1 | |||||||
| 書誌情報 |
Journal of the Physical Society of Japan Journal of the Physical Society of Japan 巻 89, p. 043001-1-043001-5, 発行日 2020-03-06 |
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| 旧ID | 51552 | |||||||
