Abstract
We have measured the temperature dependence of the superconductive critical magnetic field of three samples of beryllium from three different sources. The irregular geometric shape of one sample prevented a complete analysis of the data, but the data for the other two samples were well represented by the BCS model of superconductivity. The values of T c and H c (0) are found to be sample dependent. For the purest sample studied, T c =24.34±0.02 mK, H c (0)=107.7±0.2 μT and (γ/V)=32.9±0.3 μJ/cm3 K2. By a very small extrapolation of the data as a function of purity, it is inferred that the critical parameters for pure Be are: T c =24.38±0.02 mK, H c (0)=107.9 μT±0.2 μT and (γ/V)=33.0±0.3 μJ/cm3 K2.
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