Abstract
The Knight shift is measured in two series of superconducting V 1 − x Pt x compounds in the normal state. The composition dependence of the Knight shift of 51V and 195Pt can be explained on the basis of a variation in the density of states at the Fermi level with the Pt concentration. The orbital contribution to the Knight shift of 51V and 195Pt is observed to be concentration dependent too. The transition temperature to the superconducting state together with the upper critical field curve is measured. From these data the Ginzburg-Landau parameter κ is calculated. All measurements show that it is difficult to obtain homogeneous samples especially when the concentration of Pt in the sample is about 23%. In many samples it is observed that parts of the sample do have the A-15 structure but with different Pt concentrations.
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