期刊
JOURNAL OF APPLIED PHYSICS
卷 93, 期 10, 页码 7810-7812出版社
AMER INST PHYSICS
DOI: 10.1063/1.1540051
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We present results of H-1 nuclear magnetic resonance (NMR) and relaxation in polyoxovanadate cluster {V15} with formula K-6[V15As6O42].9(H2O). The data in {V15} are compared with the published data in {V6} with the formula [CN3H6](4)Na-2[H-4{V3L}(2)P4O4].14H(2)O, which contains two independent spin triangles. Temperature T and field H dependence of the NMR linewidth are well explained by the magnetic dipolar interaction between the proton nuclei and vanadium ion spins in both compounds. T and H dependence of proton relaxation rate T-1(-1) show great differences in the two compounds. The difference indicates a completely different spin dynamics for the two Heisenberg spin-triangle systems whereby in {V15} the fluctuations of the V-IV (s=1/2) in the central triangle are dominated by the interlayer coupling with the V-IV spins in the two upper and lower hexagons. (C) 2003 American Institute of Physics.
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