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Systematics of the dielectric constant of vortex phases in superconducting films

1982; American Physical Society; Volume: 25; Issue: 3 Linguagem: Inglês

10.1103/physrevb.25.2073

1095-3795

A. T. Fiory, A. F. Hebard,

Theoretical and Computational Physics

The magnetic field $B$, angular frequency $\ensuremath{\omega}$, and temperature dependences of the complex vortex dielectric constant ${\ensuremath{\epsilon}}_{v}$ of a thin-film superconductor are deduced from measurements of the ac impedance. A temperature close to the predicted dislocation-mediated vortex-lattice melting temperature is found which delineates low-temperature behavior, ${\ensuremath{\epsilon}}_{v}\ensuremath{\propto}B$, from high-temperature behavior, ${\ensuremath{\epsilon}}_{v}\ensuremath{\propto}\frac{B}{\ensuremath{\omega}}$, A simple two-dimensional Coulomb gas analog successfully explains the fluid phase at high temperature.