Abstract
To clarify the electronic state in a two-dimensional triangular lattice LiVS 2 , we have performed 51 V- and 7 Li-NMR measurements. Below the phase transition temperature T c of about 310 K from the paramagnetic state to a nonmagnetic state, the Knight shift of both 51 V and 7 Li does not depend on temperature. The 51 V and 7 Li spin–lattice relaxation rates 1/ T 1 show the exponential temperature dependence below T c , which indicates a gap structure of the electronic state. These results are in agreement with a trimer singlet of V 3+ spins below T c . The increase in 7 Li 1/ T 1 above T c indicates the existence of the pseudo gap and agrees with the increase in paramagnetic susceptibility with increasing temperature and with the small entropy change at T c compared with that in LiVO 2 .
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