Pulsed-field magnetization, electron spin resonance, and nuclear spin-lattice relaxation in the { Cu3 } spin triangle

Kwang Yong Choi, Naresh S. Dalal, Arneil P. Reyes, Philip L. Kuhns, Yasuhiro H. Matsuda, Hiroyuki Nojiri, Sib Sankar Mal, Ulrich Kortz

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28 Citations (Scopus)


We report on pulsed-field magnetization, Q -band electron spin resonance (ESR), and Na23 NMR measurements of the S=1 2 spin triangle clusters Na9 [Cu3 Na3 (H2 O)9 (α-X W9 O33) 2] (X=As and Sb). The pulsed-field magnetization shows pronounced hysteresis loops and magnetization steps including the half-step magnetization. The detailed magnetization behavior depends substantially on the diamagnetic heteroatom X. The angular dependence of ESR parameters necessitates Dzyaloshinskii-Moriya interaction. The temperature dependence of the Na23 spin-lattice relaxation rate, 1 T1, scales well to χ (T) T, where χ (T) is the static susceptibility. The spin-spin relaxation rate, 1 T2, increases rapidly for temperatures below 15 K due to dipolar interactions between the Na23 nuclei and Cu2+ spins. The two clusters exhibit a markedly different field dependence of 1 T1 at antilevel crossing points. The enhancement of 1 T1 is noticeable only for X=Sb. Since the spin configurations of both clusters are nearly the same, the dependence of magnetization and 1 T1 on X is ascribed to the strong coupling of the spins to a lattice vibration, leading to an enhanced mixing of the S=1 2 chiral state.

Original languageEnglish
Article number024406
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number2
Publication statusPublished - 2008 Jan 8

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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