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Abstract
We measured muon spin relaxation for a copper borate Cu 3 B 2 O 6 , which has a two-dimensional network of Cu 2+ spins. It was previously reported that the ground state of this compound was a spin singlet state [G. A. Petrakovskiĭ et al. .: Phys. Solid State 412 (1999) 610]. We, however, observed an oscillation of muon spins at low temperatures, which indicates that the ground state is a long-range-ordered state. A critical slowing down of the fluctuations of electronic spins is not observed near the critical temperature, ∼11 K, suggesting that the magnetic transition is not an ordinary second-order phase transition. In addition, the coexistence of paramagnetic domains and ordered domains is observed at 6 K< T <12 K.
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