Phase dependent differential thermopower of s-wave-superconductor-normal-metal-d-wave-superconductor junctions: Pair-breaking effects and Gaussian fluctuations

We start with revisiting our previous results on thermoelectric response of s-wave-superconductor-normal-metal-s-wave-superconductor (SNS) configurati on in a C-shaped BixPb1-xSr2CaCu2Oy sample in order to include strong fluct uation effects. Then, by appropriate generalization of the Ginzburg-Landau theory based on admixture of s-wave (S) and d-wave (D) superconductors, we consider a differential thermoelectric power (TEP) of s-wave-superconductor -normal-metal-d-wave-superconductor (SND) junction. In addition to its stro ng dependence on the relative phase theta=phi(s)-phi(d) between the two sup erconductors, two major effects are shown to influence the behavior of the predicted TEP. One, based on the chemical imbalance at SD interface, result s in a pronounced maximum of the TEP peak near theta= pi/2 (where the so-ca lled s + id mixed pairing state is formed) for two identical superconductor s with T-cd=T-cs=T-c Another effect, which should manifest itself at SD int erface, comprising an s-wave low-T-c superconductor and a d-wave high-T-c s uperconductor with T-cd not equal T-cs, predicts S(P)proportional to T-cd-T -cs for the TEP peak value. The experimental conditions under which the pre dicted behavior of the induced differential TEP can be measured are discuss ed. [S0163-1829(99)09617-4].