Spin Singlet Formation from S = 1/2 Tetrahedral Clusters
Abstract
Muon spin relaxation (μSR) and nuclear magnetic resonance (NMR) experiments revealed that the spin singlet state with an excitation gap of 200 K is realized from S = 1/2 Nb4 tetrahedral clusters in a cluster Mott insulator GaNb4S8. The intercluster cooperative phenomenon to the singlet state at TS = 32 K is triggered by intracluster Jahn-Teller type structural instability developed from 3TS. Referring to the lattice symmetry, the formation of Nb8 octamer (Nb4--Nb4 bond) is suggested.
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