Failure of the empirical OCT law in the compound

Z. Konstantinović; G. Le Bras; A. Forget; D. Colson; F. Jean; G. Collin; Z. Z. Li; H. Raffy; C. Ayache

doi:10.1209/epl/i2003-00354-1

All issues

Volume 62 / No 2 (April 2003)

Europhys. Lett., 62 2 (2003) 257-263

Abstract

Issue		Europhys. Lett. Volume 62, Number 2, April 2003


Page(s)		257 - 263
Section		Condensed matter: electronic structure, electrical, magnetic, and optical properties
DOI		https://doi.org/10.1209/epl/i2003-00354-1
Published online		01 April 2003

Europhys. Lett., 62 (2), pp. 257-263 (2003)

Failure of the empirical OCT law in the ${Bi_2Sr_2}{CuO}_{6+\delta}$ compound

Z. Konstantinović¹, G. Le Bras¹, A. Forget¹, D. Colson¹, F. Jean², G. Collin², Z. Z. Li³, H. Raffy³ and C. Ayache¹

¹ SPEC, DSM/DRECAM, CEA Saclay - 91191 Gif-sur-Yvette, France
² LLB, DSM/DRECAM, CEA-CNRS, CEA Saclay - 91191 Gif-sur-Yvette, France
³ LPS, Bât. 510, Université Paris-Sud - 91405 Orsay, Cédex, France

Received: 7 November 2002
Accepted: 12 February 2003

Abstract

We have studied the evolution of the thermoelectric power S(T) with oxygen doping of single-layered $\chem{Bi_2Sr_2CuO}$ $_{6+\delta}$ thin films and ceramics in the overall superconducting ( $T_\ab{c}$ , $S_{290\un{K}}$ ) phase diagram. While the universal relation between the room temperature thermopower $S_{290\un{K}}$ and the critical temperature is found to hold in the strongly overdoped region $(\delta>0.14)$ , a strong violation is observed in the underdoped part of the phase diagram. The observed behaviour is compared with other cuprates and the different scenarios are discussed.

PACS: 74.25.Fy – Transport properties (electric and thermal conductivity, thermoelectric effects, etc.) / 74.20.Mn – Nonconventional mechanisms (spin fluctuations, polarons and bipolarons, resonating valence bond model, anyon mechanism, marginal Fermi liquid, Luttinger liquid, etc.) / 74.72.Hs – $\chem{Bi}$ -based cuprates

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