Phase dependent differential thermopower of SND junctions: Pair-breaking effects and Gaussian fluctuations
Abstract
We start with revisiting our previous results on thermoelectric response of SNS configuration in a C-shaped Bi(x)Pb(1-x)Sr(2)CaCu(2)O(y) sample in order to include strong fluctuation effects. Then, by appropriate generalization of the Ginzburg-Landau theory based on admixture of s-wave and d-wave superconductors, we consider a differential thermoelectric power (TEP) of SND junction. In addition to its strong dependence on the relative phase θ =φs-φd 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 θ =π /2 (where the so-called s+id mixed pairing state is formed) for two identical superconductors (with Td=Ts Tc). Another effect, which should manifest itself at SD interface comprising an s-wave low-Tc superconductor and a d-wave high-Tc superconductor (with Td≠ Ts), predicts Sp Td-Ts for the TEP peak value. The experimental conditions under which the predicted behavior of the induced differential TEP can be measured are discussed.
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