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Superconductivity -- October 1989 -- Volume 2, Issue 10, pp. 78-88

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Microwave absorption in type I superconductor in weak magnetic field

A. S. Kheifets, A. I. Veinger, and S. V. Kozakov

A. F. Ioffe Physicotechnical Institute, Academy of Sciences of the USSR, 194021, Leningrad

(Received June 7, 1989)

A microwave absorption which depends strongly on the magnetic field has been observed in conventional type I superconductors (Pb, Sn, Hg, In) at temperatures near the transition to the normal state. This field-dependent absorption has been seen previously in high T_c superconductors. In weak fields H % H_c(T), the absorption intensity is a quadratic function of the field, I(H) ~ [H/H_c(T)]², where H_c(T) is the critical field at the given temperature. The observed effect can be attributed to an increase in the depth to which the microwave field penetrates into the superconductor in a static magnetic field. This increase becomes sharply larger in a superconductor with a defective surface.

PACS: 74.30.Gn, 74.70.Be      Additional Information

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