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  1. 020 教育学部
  2. 10 学術雑誌論文
  3. 10 査読済論文
  1. 0 資料タイプ別
  2. 01 学術雑誌論文

Low-frequency spin dynamics and NMR spin-lattice relaxation in antiferromagnetic rings

http://hdl.handle.net/10191/30867
c8afbf9b-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 83_014404_1-5.pdf (327.7 kB)
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
言語 en
タイトル Low-frequency spin dynamics and NMR spin-lattice relaxation in antiferromagnetic rings
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.

WEKO 7676

Itou, T.

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Sagane, T.

× Sagane, T.

WEKO 7677

Sagane, T.

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Oyamada, A.

× Oyamada, A.

WEKO 7678

Oyamada, A.

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Maegawa, S.

× Maegawa, S.

WEKO 7679

Maegawa, S.

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Igarashi, S.

× Igarashi, S.

WEKO 7680

Igarashi, S.

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Yukawa, Y.

× Yukawa, Y.

WEKO 7681

Yukawa, Y.

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著者別名
識別子
識別子 7682
識別子Scheme WEKO
姓名
姓名 五十嵐, 智志
著者別名
識別子
識別子 7683
識別子Scheme WEKO
姓名
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
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
関連識別子
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
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