On the possibility of observation of the 3D–2D phase transition in vortex lattice of layered high-temperature superconductors of BSCCO (Bi 1.7Pb 0.3Sr 2Ca 2Cu 3O y)

Abstract

Using the high-sensitive mechanical method of measuring (Zh. Eksp. Teor. Fiz. 65 (1973) 1923) the dissipation processes in superconductors, the 3D–2D phase transition in magnetic field was investigated in the vortex lattice of strongly anisotropic high-temperature superconductors of Bi(2223) system. It was shown that with the increase of external magnetic field the dissipation connected with a motion of vortexes relative to the crystal lattice of a sample, first increases, reaching the maximum and then with a further increase of the magnetic field sharply reduces as a result of pinning enhancement in connection with the transition of three-dimensional vortex system in quasi-two-dimensional “pancake” one.