Positive Seebeck Coefficient in Highly Doped La_(2−x) Sr_x CuO_4 (x = 0.33); Its Origin and Implication

Hao Jin, Alessandro Narduzzo, Minoru Nohara, Hidenori Takagi, N. E. Hussey, Kamran Behnia

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8 Citations (SciVal)

Abstract

We present a study of the thermoelectric (Seebeck and Nernst) response in heavily overdoped, non-superconducting La1.67Sr0.33CuO4. 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.

Original languageEnglish
Article number053702
Pages (from-to)053702
JournalJournal of the Physical Society of Japan
Volume90
Issue number5
Early online date9 Apr 2021
DOIs
Publication statusPublished - 15 May 2021

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