Glassy behaviour in resistive measurements in Bi sub(2)Sr sub(2)CaCu sub(2)O sub(x)

• Published in: Superconductor science & technology Vol. 6; no. 1; pp. 53 - 58
• Main Authors: Fastampa, R, Giura, M, Marcon, R, Sarti, S, Silva, E
• Format: Journal Article
• Language: English
• Published: 01.01.1993
• ISSN: 0953-2048

We present a large set of measurements of resistance as a function of magnetic field at fixed temperatures, and as a function of temperature at fixed magnetic field, in epitaxial highly-oriented Bi:2212 films. A new model of the glassy dynamics of the flux lines is developed, where the leading dissipative term is the phase slippage of the flux lines over a disordered network of highly-damped Josephson junctions, with an activation process given by a Vogel-Fulcher equation. The glass-to-liquid temperature obtained by the fits reproduces the irreversibility line reported in the literature. The proposed phenomenological model is able to fit all the data from low temperatures up to T sub(c), for the accessible magnetic field range.