Negative Magnetoresistance of Layered High-tc Compounds |
| Yu.V. Medvedeva, S.V. Yampolskiia and S.J. Lewandowskib a Donetsk Physical-Technical Institute of the National Academy of Sciences of Ukraine, Donetsk 340114, Ukraine b Instytut Fizyki PAN, Al. Lotników 32/46, 02-668 Warszawa, Poland |
| Received: July 8, 1999 |
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| Magnetoresistance of layered high-Tc 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 dS 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. |
| DOI: 10.12693/APhysPolA.96.501 PACS numbers: 74.72.Jt, 74.80.Dm |