Positive Seebeck coefficient in highly doped La${}_{2-x}$Sr${}_x$CuO${}_4$ ($x$=0.33); its origin and implication

Abstract

We present a study of the thermoelectric (Seebeck and Nernst) response in heavily overdoped, non-superconducting La${}_{1.67}$Sr${}_{0.33}$CuO${}_4$. In spite of the electron-like curvature of the Fermi surface, the Seebeck coefficient is positive at low temperatures. Such a feature, previously observed in copper, silver, gold and lithium, is caused by a non-trivial energy dependence of the scattering time. We argue that this feature implies a strong asymmetry between the lifetime of occupied and unoccupied states along the zone diagonals and such an electron-hole asymmetry impedes formation of Cooper pairs along the nodal direction in the superconducting ground state emerging at lower doping levels.

5 pages, 3 figures

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• Electronic band structure of a superconducting nickelate probed by the Seebeck coefficient in the disordered limit
• Unified approach to electrical and thermal transport in high-$T_c$ superconductors
• On the dynamic distinguishability of nodal quasi-particles in overdoped cuprates