<sup><b>51</b></sup>V-NMR Studies on the Spin Dynamics of<i><i>S</i>=<b>1/2</b></i>Zig-Zag Chains of VO<sub><b>5</b></sub>Pyramids

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  • Kobayashi Yoshiaki
    Department of Physics, Division of Material Science, Nagoya University, Furo–cho, Chikusa–ku, Nagoya 464–8602 CREST, Japan Science and Technology Corporation (JST)
  • Fukamachi Toshihiko
    Department of Physics, Division of Material Science, Nagoya University, Furo–cho, Chikusa–ku, Nagoya 464–8602
  • Kanada Masaki
    Department of Physics, Division of Material Science, Nagoya University, Furo–cho, Chikusa–ku, Nagoya 464–8602
  • Harashina Hiroshi
    Department of Physics, Division of Material Science, Nagoya University, Furo–cho, Chikusa–ku, Nagoya 464–8602 CREST, Japan Science and Technology Corporation (JST)
  • Tanaka Shukichi
    Department of Physics, Saga University, Honjo–1, Saga–city, Saga 840–8502
  • Sato Masatoshi
    Department of Physics, Division of Material Science, Nagoya University, Furo–cho, Chikusa–ku, Nagoya 464–8602 CREST, Japan Science and Technology Corporation (JST)

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  • 51V-NMR Studies on the Spin Dynamics of S=1/2 Zig-Zag Chains of VO5 Pyramids.

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NMR Knight shifts K and nuclear relaxation rates 1/T1 have been studied on the V4+ sites of two compounds [N(CH3)4]V3O7 and (en)2ZnV6O14 which are known to exhibit spin-gap behavior from their susceptibility data. The activation-type behavior has been observed in K and 1/T1, confirming the existence of the spin-gap in these systems. The frequency (ω N) dependence of 1/T1 of [N(CH3)4]V3O7 has been found to be 1/√ ω N-type one and 1/T1 of (en)2ZnV6O14 is linear in -ln (ω N), indicating the diffusive and ballistic characters of the triplet excitations, respectively. The results are discussed in relation to the theory recently developed by Sachdev and Damle [Phys. Rev. B 57 (1998) 8307].

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