Ginzburg--Landau parameters for a vanadium single crystal having a resistivity ratio of 7. 8

Magnetization curves for a cylindrical specimen made of a single crystal of vanadium are obtained at several temperatures. The method utilizes electronic integration of the difference in terminal voltages from two identical coils, one of which contains the specimen when the applied field is cycled over the operating range. The integrated voltage is proportional to the magnetic moment of the specimen, and is plotted continuously on anx-y recorder as a function of applied field. The Ginzburg-Landau parametersK1andK2are obtained from the magnetization curves, and the results are compared with the theoretical calculations of Eilenberger and others.