Abstract
The nuclear spin-lattice relaxation time T 1 of V 51 in a type II superconductor V 3 Sn in the mixed state has been measured. In the case of T c (0)> T c ( H )>0.6 T c (0), abrupt decrease of T 1 appears at the critical temperature corresponding to the magnetic field in which T 1 was measured, T c ( H ), and then increases gradually. In this case of low magnetic field and high temperatures near T c (0), the temperature variation of T 1 shows the behavior predicted by a Bardeen-Cooper-Schrieffer (BCS) theory of superconductivity. In the case of T c ( H )<0.6 T c (0), just below T c ( H ) corresponding to that field, T 1 shows no minimum but increases monotonically. These behaviors in the case of high magnetic field and low temperatures can be understood quantitatively on the basis of the theory of gapless superconductivity.
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