Critical magnetic fields of distorted gallium films
B.G. LazarevKhar’kov Physicotechnical Institute of the Academy of Sciences of the Ukrainian SSRE. E. SemenenkoKhar’kov Physicotechnical Institute of the Academy of Sciences of the Ukrainian SSRV. I. TutovKhar’kov Physicotechnical Institute of the Academy of Sciences of the Ukrainian SSR
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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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