Negative Magnetoresistance of Layered High-t_cCompounds

Abstract

Magnetoresistance of layered high-Tc systems with quasi-two-dimensional superconductivity in maguetic field II applied parallel to superconducting planes was investigated theoretically. In such configuration an increase iu the magnetic field inteusity decreases the critical temperature of superconducting regions. It canses both a. snppression of the gap parameter 4 and an increase iu the tunneling current. between the decoupled supercouducting plaues and, as a consequeuce, leads to negative magnetoresistance. The depeudence of tunneling current on H was calculated for superconducting layer thickness ds smaller than the superconducting correlation leugth. The results can be nsed for analysis of curreut-voltage characteristics of both supercondnctor-insulator-superconductor and superconductor-insnlatoruormal metal to multilayered tunnel structnres.