Thermoelectric effect in high-T c superconductors: The role of density-of-states fluctuations

We study the effect of the density-of-states (DOS) fluctuations on the thermoelectric coefficient of a highly anisotropic superconductor above the critical temperature. It is shown that it is the DOS contribution which gives rise to the leading correction to the thermoelectric coefficient, in spite of previous results where only the Aslamazov-Larkin term was taken into account. This conclusion is valid for an arbitrary impurity concentration. Pis’ma Zh. éksp. Teor. Fiz. 65, No. 2, 182–187 (25 January 1997) Published in English in the original Russian journal. Edited by Steve Torstveit.