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Negative Magnetoresistance of Layered High-t_{c} Compounds

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Medvedev Y., Yampolskii S., Lewandowski S.
Acta Physica Polonica A
|
1999
|
vol. 96
|
issue 3-4
501-504
EN
Magnetoresistance of layered high-T_{c} systems with quasi-two-dimensional superconductivity in magnetic field H applied parallel to superconducting planes was investigated theoretically. In such configuration an increase in the magnetic field intensity decreases the critical temperature of superconducting regions. It causes both a suppression of the gap parameter Δ and an increase in the tunneling current between the decoupled superconducting planes and, as a consequence, leads to negative magnetoresistance. The dependence of tunneling current on H was calculated for superconducting layer thickness d_{S} smaller than the superconducting correlation length. The results can be used for analysis of current-voltage characteristics of both superconductor-insulator-superconductor and superconductor-insulator normal metal multilayered tunnel structures.
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