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The ground state of the quantum spin system kappa-(BEDT-TTF)2Cu2(CN)3 inwhich antiferromagnetically-interacting S=1/2 spins are located on a nearlyequilateral triangular lattice attracts considerable interest both fromexperimental and theoretical aspects, because a simple antiferromagnetic ordermay be inhibited because of the geometrical frustration and hence an exoticground state is expected. Furthermore, recent two reports on the ground stateof this system have made it further intriguing by showing completelycontroversial results; one indicates the gapless state and the other gapped. Byutilizing microscopic probe of muSR, we have investigated its spin dynamicsbelow 0.1 K, unveiling its microscopically phase separated ground state at zerofield.

Microscopic phase separation in triangular-lattice quantum spin magnet kappa-(BEDT-TTF)2Cu2(CN)3 probed by muon spin relaxation