LOW-FREQUENCY OHMIC LOSSES IN HIGH T-C SU PERCONDUCTORS

Using high-T-c supercondutors of the (RE)Ba2Cu3Ox type (where RE are t he rare-earth metals) and T1 and Bi ceramics as an example, it has bee n shown that both the types of materials share the common property, i. e. an anomalous increase in ohmic losses over a certain frequency rang e, which retains in the normal and the superconducting states. The sim ilarity and distinctions of the anomalous behaviour of the resistance for the normal and superconducting states are described. It has been f ound that in the frequency range where the anomaly is observed, superc onductivity is suppressed; however, in ceramics with a magnetic admixt ure it is partially restores in a constant magnetic field.