Calculation of T-c in a normal-superconductor bilayer using the microscopic-based Usadel theory

Citation
Jm. Martinis et al., Calculation of T-c in a normal-superconductor bilayer using the microscopic-based Usadel theory, NUCL INST A, 444(1-2), 2000, pp. 23-27
Citations number
7
Categorie Soggetti
Spectroscopy /Instrumentation/Analytical Sciences","Instrumentation & Measurement
Journal title
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
ISSN journal
01689002 → ACNP
Volume
444
Issue
1-2
Year of publication
2000
Pages
23 - 27
Database
ISI
SICI code
0168-9002(20000411)444:1-2<23:COTIAN>2.0.ZU;2-N
Abstract
The Usadel equations give a theory of superconductivity, valid in the diffu sive limit, that is a generalization of the microscopic equations of the BC S theory. Because the theory is expressed in a tractable and physical form, even experimentalists can analytically and numerically calculate detailed properties of superconductors in physically relevant geometries. Here, we d escribe the Usadel equations and review their solution in the case of predi cting the transition eeo temperature T-C of a thin normal-superconductor bi layer. We also extend this calculation for thicker bilayers to show the dep endence on the resistivity of the films. These results, which show a depend ence on both the interface resistance and heat capacity of the films, provi de important guidance on fabricating bilayers with reproducible transition temperatures. Published by Elsevier Science B.V.