Critical magnetic fields of distorted gallium films

The paper presents results of an investigation of critical magnetic fields of gallium films freshly condensed on a substrate cooled to the temperature of liquid helium and also annealed to 60°K. The thickness of the film is ∼ 150 Å. It is found that the transverse critical magnetic field in freshly condensed films is ∼ 105 Oe for Tk ∼ 8.3 °K, i.e., HK1(O) ∼ 1.2 × 104TK. The function HK⊥ (T) deviates considerably from a linear law; this is probably connected with the multiphase nature of the gallium films. The values of the critical magnetic field after annealing to 60 °K are slightly reduced, and the superconducting transition curve in this case is more smeared.

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