Crossover effects for critical currents within Landau-Ginzburg phenomenology incorporating Josephson weak links in superconducting thin films of YBaCu2O7-delta
UNSPECIFIED. (1999) Crossover effects for critical currents within Landau-Ginzburg phenomenology incorporating Josephson weak links in superconducting thin films of YBaCu2O7-delta. PHYSICAL REVIEW B, 60 (14). pp. 10513-10521. ISSN 0163-1829Full text not available from this repository.
Following a number of investigations into the nature of critical currents in superconducting thin films of YBaCu2O7-delta (YBCO), we provide a theoretical analysis of the possible origins of crossover effects. The framework within which our analysis is based involves local condensates described by the Landau-Ginzburg (LG) model and coupled to their neighbors via Josephson weak links. Within the LG phenomenology critical current behavior depends on the presence and strength of the various expansion coefficients. We show that the corresponding critical exponent for j(c) varies between 3/2 and 1. We then incorporate the oxygen deficiency effect, which scales the critical temperature as well as other model parameters. In the last part of the paper we investigate the effect of weak links on the critical current's exponent and again show that the latter may vary between the LG and Ambegaokar-Baratoff regimes of 3/2 and 1, respectively. Combining this analysis with an appropriate choice of model parameters we obtain excellent agreement with the recent experimental data of Darhmaoui and Jung [Phys. Rev. B 53, 14 621 (1996)]. [S0163-1829(99)00838-3].
|Item Type:||Journal Article|
|Subjects:||Q Science > QC Physics|
|Journal or Publication Title:||PHYSICAL REVIEW B|
|Publisher:||AMERICAN PHYSICAL SOC|
|Date:||1 October 1999|
|Number of Pages:||9|
|Page Range:||pp. 10513-10521|
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