μSR Studies on Spin-Peierls System Cu_<1-x>Zn_xGeO_3 (x=0, 0.01, 0.03, and 0.07)

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The zero-field and the longitudinal field spin-relaxations of positive muon (μ^+ ) were measured in Cu_<1-x>Zn_xGeO_3 (x=0, 0.01, 0.03, and 0.07) to study the spin-Peierls system. The obtained relaxation functions were separated into two components below T_<sp> in CuGeO_3. We conclude that the fast relaxation is originated from a few Cu^<2+> spins being not coupled with spin-singlet state, and that the slow relaxation is due to the nuclear dipolar fields. The fast relaxation function shape changes to the Gaussian at 5 K in the sample of x=0.07. The system changes from the static diluted to the densed one. We also confirmed the appearances of the spin-glass-like relaxations at 5 K in the samples of x=0.03 and 0.07.
社団法人日本物理学会の論文
1995-08-15