%0 Journal Article
%J Physical Review B
%D 2012
%T Kinetic impedance and depairing in thin and narrow superconducting films
%A Clem, J. R.
%A Kogan, V. G.
%K conductivity coherence peak
%K coupling force
%K electromagnetic
%K ginzburg-landau equations
%K ii superconductors
%K impurities
%K inductance
%K magnetic-field
%K pair-breaking
%K paramagnetic
%K persistent currents
%K PROPERTIES
%M WOS:000311714600005
%P 174521
%R 10.1103/PhysRevB.86.174521
%U ://WOS:000311714600005
%V 86
%X We use both Eilenberger-Usadel and Ginzburg-Landau (GL) theory to calculate the superfluid's temperature-dependent kinetic inductance for all currents up to the depairing current in thin and narrow superconducting films. The calculations apply to BCS weak-coupling superconductors with isotropic gaps and transport mean-free paths much less than the BCS coherence length. The kinetic inductance is calculated for the response to a small alternating current when the film is carrying a dc bias current. In the slow-experiment/fast-relaxation limit, in which the superconducting order parameter quasistatically follows the time-dependent current, the kinetic inductance diverges as the bias current approaches the depairing value. However, in the fast-experiment/slow-relaxiation limit, in which the the superconducting order parameter remains fixed at a value corresponding to the dc bias current, the kinetic inductance rises to a finite value at the depairing current. We then use time-dependent GL theory to calculate the kinetic impedance of the superfluid, which includes not only the kinetic reactance, but also the kinetic resistance of the superfluid arising from dissipation due to order-parameter relaxation. The kinetic resistance is largest for angular frequencies omega obeying omega tau(s) > 1, where tau(s) is the order-parameter relaxation time, and for bias currents close to the depairing current. We also include the normal fluid's contribution to dissipation in deriving an expression for the total kinetic impedance. The Appendices contain many details about the temperature-dependent behavior of superconductors carrying current up to the depairing value.
%Z ISI Document Delivery No.: 045RNTimes Cited: 0Cited Reference Count: 91Clem, John R. Kogan, V. G.US Department of Energy, Office of Basic Energy Science, Division of Materials Sciences and Engineering; US Department of Energy [DE-AC02-07CH11358]We thank K. K. Berggren, Y. Mawatari, D. Prober, D. Santavicca, and S. M. Anlage for stimulating suggestions and comments. This research was supported by the US Department of Energy, Office of Basic Energy Science, Division of Materials Sciences and Engineering and was performed at the Ames Laboratory, which is operated for the US Department of Energy by Iowa State University under Contract No. DE-AC02-07CH11358.Amer physical socCollege pk
%8 12
%9 Article
%@ 1098-0121