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Low-frequency spin dynamics and NMR spin-lattice relaxation in antiferromagnetic rings
http://hdl.handle.net/10191/30867
http://hdl.handle.net/10191/30867c8afbf9b-ddad-42b9-9248-62f66bbe4ee5
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
83_014404_1-5.pdf (327.7 kB)
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| Item type | 学術雑誌論文 / Journal Article(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2014-12-05 | |||||
| タイトル | ||||||
| タイトル | Low-frequency spin dynamics and NMR spin-lattice relaxation in antiferromagnetic rings | |||||
| タイトル | ||||||
| タイトル | Low-frequency spin dynamics and NMR spin-lattice relaxation in antiferromagnetic rings | |||||
| 言語 | en | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 資源タイプ | ||||||
| 資源 | http://purl.org/coar/resource_type/c_6501 | |||||
| タイプ | journal article | |||||
| 著者 |
Itou, T.
× Itou, T.× Sagane, T.× Oyamada, A.× Maegawa, S.× Igarashi, S.× Yukawa, Y. |
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| 著者別名 | ||||||
| 識別子Scheme | WEKO | |||||
| 識別子 | 7682 | |||||
| 姓名 | 五十嵐, 智志 | |||||
| 著者別名 | ||||||
| 識別子Scheme | WEKO | |||||
| 識別子 | 7683 | |||||
| 姓名 | Igarashi, Satoshi | |||||
| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | We develop a general theory of the spin dynamics of Heisenberg antiferromagnetic rings (HAFRs) that explains the mechanism of NMR spin-lattice relaxation at low temperatures. In HAFRs, the imaginary parts of the q-summed dynamic spin susceptibilities parallel and perpendicular to an applied static field, χ′′sum∥(ω) and χ′′sum⊥(ω), are composed of the sum of many slightly broadened δ-functional modes at many frequencies. The NMR relaxation is caused by the quasielastic mode in χ′′sum∥(ω) at around zero frequency. This quasielastic mode is characterized by two physical quantities, intensity P0∥ and frequency width Γ0∥. Although P0∥ has to date been assumed to be identical to the uniform static susceptibility, we point out that the two quantities are not identical. Without making this unreliable assumption for P0∥, we demonstrate experimentally how P0∥ and Γ0∥ behave, by analyzing the NMR relaxation rates of two different nuclei, H1 and C13, in a real HAFR. This analysis is more rigorous and thus can be used to estimate Γ0∥ and P0∥ more precisely than previously possible. We find that the temperature dependence of P0∥ exhibits activation-type behavior reflecting the first excitation gap. We also find that Γ0∥ decreases monotonically on cooling but saturates to a nonzero value at zero temperature. This strongly suggests that Γ0∥ is dominated not only by the electron-phonon interactions but also by internanomagnet dipole interactions, which have been neglected to date. | |||||
| 書誌情報 |
Physical Review B en : Physical Review B 巻 83, 号 014404, p. 1-5, 発行日 2011-01 |
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| 出版者 | ||||||
| 出版者 | American Physical Society | |||||
| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 10980121 | |||||
| 書誌レコードID | ||||||
| 収録物識別子タイプ | NCID | |||||
| 収録物識別子 | AA11187113 | |||||
| DOI | ||||||
| 識別子タイプ | DOI | |||||
| 関連識別子 | info:doi/10.1103/PhysRevB.83.014404 | |||||
| 権利 | ||||||
| 権利情報 | Copyright(C)2011 The American Physical Society | |||||
| 著者版フラグ | ||||||
| 値 | publisher | |||||
