V-51 KNIGHT-SHIFT IN THE SUPERCONDUCTING STATE OF V3SI

The V-51 Knight shift K has been measured to study the symmetry of the Cooper pair in an A15 superconductor V3Si. Below T-c, the contributio n of the core polarization to K decreases drastically with decreasing temperature and vanishes completely at low temperature. This means tha t the Cooper pair is spin-singlet type. The field dependence of K is d iscussed considering the diamagnetic correction. The fact that K measu red at 6 MHz is larger than K at 12 MHz suggests the possibility of th e contribution of the paramagnetic limiting effect. (C) 1998 Elsevier Science B.V. All rights reserved.