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Resistivity of high-temperature superconductors: Is the vortex state a liquid?

1990; American Physical Society; Volume: 64; Issue: 26 Linguagem: Inglês

10.1103/physrevlett.64.3187

1092-0145

Sudip Chakravarty, B. I. Ivlev, Yuri N. Ovchinnikov,

Iron-based superconductors research

We discuss thermally activated resistivity of strongly layered high-temperature superconductors such as ${\mathrm{Bi}}_{2}$${\mathrm{Sr}}_{2}$${\mathrm{CaCu}}_{2}$${\mathrm{O}}_{8}$ in the limit in which the dominant pinning mechanism is the intrinsic pinning due to the layered structure. From a comparison of our theory with the experimental data we conclude that the vortex state of such superconductors must be disordered over a substantial range of parameters---a melted liquid. The magnetic field, the temperature, and the current dependence of the calculated activation energy are consistent with experiments.