Abstract

In muon spin relaxation studies on the S = 12 double chain system KCuCl3, which is thought to have a spin singlet ground state with a finite spin gap, we found that the muon spin becomes strongly depolarized below 20 K. Under a longitudinal magnetic field of 3800 G, the temperature dependence of the muon spin relaxation rate shows a cusp at ∼ 5 K, where the relaxation rate increases with increasing longitudinal magnetic fields, suggesting the existence of a frustrated spin state. We believe that the origin of the muon spin relaxation is related to the electron spins of the Cu2+ ions which form the doubie chains or formation of the paramagnetic muon state. Possible other reasons of the muon spin relaxation are also discussed.

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