The NMR shift and the nuclear spin-lattice relaxation rate (1/ T 1 ) were measured at the V sites in the two-dimensional compound CaV 4 O 9 . The NMR shift becomes a positive constant below ∼15 K, indicating that the intrinsic spin susceptibility vanishes at low temperatures. The activated T dependence of 1/ T 1 has revealed the dynamical spin gap Δ R ∼104 K, which is rather smaller than the static spin gap determined from the susceptibility Δ S ∼135 K.
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Ohama et al. (1997) studied this question.
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