Phase dependent differential thermopower of SND junctions: Pairbreaking effects and Gaussian fluctuations
Abstract
We start with revisiting our previous results on thermoelectric response of SNS configuration in a Cshaped Bi(x)Pb(1x)Sr(2)CaCu(2)O(y) sample in order to include strong fluctuation effects. Then, by appropriate generalization of the GinzburgLandau theory based on admixture of swave and dwave superconductors, we consider a differential thermoelectric power (TEP) of SND junction. In addition to its strong dependence on the relative phase \theta =\phi_s\phi_d between the two superconductors, two major effects are shown to influence the behavior of the predicted TEP. One, based on the chemical imbalance at SD interface, results in a pronounced maximum of the TEP peak near \theta =\pi /2 (where the socalled s+id mixed pairing state is formed) for two identical superconductors (with T_d=T_s\equiv T_c). Another effect, which should manifest itself at SD interface comprising an swave lowT_c superconductor and a dwave highT_c superconductor (with T_d\neq T_s), predicts S_p\propto T_dT_s for the TEP peak value. The experimental conditions under which the predicted behavior of the induced differential TEP can be measured are discussed.
 Publication:

arXiv eprints
 Pub Date:
 February 1999
 arXiv:
 arXiv:condmat/9902259
 Bibcode:
 1999cond.mat..2259S
 Keywords:

 Condensed Matter  Superconductivity
 EPrint:
 10 pages (REVTEX), 4 PS figures (epsf.sty). To be published in PRB