Abstract
The temperature dependences ρ(T) of the electrical resistivity of the granular high-temperature superconductor YBa2Cu3O7-δ are measured in different transverse external magnetic fields 0 ≤ Hext ≤ 100 Oe for temperatures ranging from the temperature Tρ=0 at which resistivity appears to the critical superconducting transition temperature Tc and transport current densities ranging from 50 to 2000 mA/cm2. The effects of temperature, external magnetic field, and transport current density on the kinetics of phase transitions in both subsystems of the granular HTSC are studied. The possibility of a topological phase transition—a Berezinskii-Kosterlitz-Thouless phase transition in a Josephson medium—is established and the conditions for its occurrence are studied.
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