Abstract
The microscopic magnetic properties of superconducting (\(T_{\text{C}}\cong 6\) K) λ-(BETS) 2 GaCl 4 (BETS = bis(ethylenedithio)tetraselenafulvalene) have been investigated by 77 Se NMR in the normal state between 7.1 and 100 K on randomly oriented single crystals with κ-(BETS) 2 GaCl 4 as a reference compound. From the T -dependences of the Knight shift and the linewidth, the intrinsic uniform susceptibility χ q =0 ( T ) has been found to decrease with decreasing T below 30 K for λ-(BETS) 2 GaCl 4 . Nevertheless, 1/( T 1 T ) does not show any corresponding decrease but is constant down to the lowest T , which indicates increasing contributions with decreasing T from antiferromagnetic spin fluctuations. The Knight shift and 1/( T 1 T ) have been analyzed quantitatively and the enhancement factor K (α)>1 is deduced in the low- T limit. On the basis of these results, the development of antiferromagnetic spin fluctuations of π-electrons at low T is concluded for λ-(BETS) 2 GaCl 4 .
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