ELECTRONIC-PROPERTIES OF HIGH-TEMPERATURE SUPERCONDUCTOR DYBA2CU3O7 FROM CRITICAL FIELDS AND SPECIFIC-HEAT STUDIES

The lower and upper critical fields, as well as the specific heat were measured as a function of temperature for good quality DyBa2Cu3O7 hig h-temperature superconductor in the vicinity of superconducting transi tion temperature T(c) = 91.2 K. The number of superconducting and norm al state electronic quantities were determined basing on the Ginzburg- Landau-Abrikosov-Gorkov theory. It is argued that on the basis of this BCS-like theory one can describe the superconducting properties and, in combination with some information on the electronic structure, also the magnetic properties of high-temperature superconductors.