Internal magnetic structure and spin dynamics in transverse field of the molecular nanomagnet Mn12-acetate studied by 55Mn NMR

Y. Furukawa, K. Watanabe, K. Kumagai, F. Borsa, T. Sasaki, N. Kobayashi, D. Gatteschi

研究成果: Article査読

18 被引用数 (Scopus)

抄録

55Mn nuclear magnetic resonance (NMR) measurements have been carried out on an oriented powder sample of Mn12 clusters in order to investigate microscopically the inner spin structure and spin dynamics of the molecule in its high-spin S = 10 ground state. The external magnetic-field dependence of 55Mn-NMR spectrum up to 15 T gives a direct confirmation of the internal magnetic structure of the Mn12 cluster, in which spin moments of Mn4+ (S = 3/2) ions are polarized antiparallel to that of Mn3+ (S = 2) ions. It is proved that the microscopic spin configuration rotates rigidly when an external magnetic-field is applied perpendicular to the easy axis. When the magnetic-field is applied parallel to the easy axis of the Mn12 cluster, the nuclear-spin-lattice relaxation rate 1/T1 decreases as expected from the field dependence of the lifetime broadening of the low-lying sublevels due to spin-phonon interaction. On the other hand, for transverse fields 1/T1 increases with H displaying a broad maximum at H = 5-6 T. This behavior can be accounted for only in part by spin-phonon interaction. The dominant contribution to 1/T1 for transverse field is shown to arise from quantum fluctuations of the component of the magnetization transverse to the nuclear Zeeman quantization axis.

本文言語English
論文番号064426
ページ(範囲)644261-644267
ページ数7
ジャーナルPhysical Review B - Condensed Matter and Materials Physics
67
6
出版ステータスPublished - 2003 2 1

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学

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