Out-of-plane thermopower of strongly correlated layered systems: An application to Bi2(Sr,La)2CaCu2O8+δ

T. W. Silk, I. Terasaki, T. Fujii, and A. J. Schofield
Phys. Rev. B 79, 134527 – Published 29 April 2009

Abstract

We calculate the out-of-plane thermopower in a quasi-two-dimensional system and argue that this quantity is an effective probe of the asymmetry of the single-particle spectral function. We find that the temperature and doping dependence of the out-of-plane thermopower in Bi2(Sr,La)2CaCu2O8+δ single crystals is broadly consistent with the behavior of the spectral function determined from angle resolved photoemission spectroscopy and tunneling experiments. We also investigate the relationship between out-of-plane thermopower and entropy in a quasi-two-dimensional material. We present experimental evidence that at moderate temperatures, there is a qualitative correspondence between the out-of-plane thermopower in Bi2(Sr,La)2CaCu2O8+δ and the entropy obtained from specific-heat measurements. Finally, we argue that the derivative of the entropy with respect to particle number may be the more appropriate quantity to compare with the thermopower rather than the entropy per particle.

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  • Received 26 February 2009

DOI:https://doi.org/10.1103/PhysRevB.79.134527

©2009 American Physical Society

Authors & Affiliations

T. W. Silk1, I. Terasaki2,3, T. Fujii4, and A. J. Schofield1

  • 1School of Physics and Astronomy, The University of Birmingham, Birmingham, B15 2TT, United Kingdom
  • 2Department of Applied Physics, Waseda University, Tokyo 169-8555, Japan
  • 3CREST, Japan Science and Technology Agency, Tokyo 103-0027, Japan
  • 4Cryogenic Center, The University of Tokyo, Tokyo 113-0032, Japan

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Issue

Vol. 79, Iss. 13 — 1 April 2009

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