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(c), for the accessible magnetic field range.
Fastampa, R., Giura, M., Marcon, R., Sarti, S., Silva, E. (1993). GLASSY BEHAVIOR IN RESISTIVE MEASUREMENTS IN BI2SR2CACU2OX. SUPERCONDUCTOR SCIENCE & TECHNOLOGY, 6(1), 53-58 [10.1088/0953-2048/6/1/007].
GLASSY BEHAVIOR IN RESISTIVE MEASUREMENTS IN BI2SR2CACU2OX
SILVA, Enrico
1993-01-01
Abstract
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(c), for the accessible magnetic field range.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
