Volume 62, Number 2, April 2003
|Page(s)||257 - 263|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 April 2003|
Failure of the empirical OCT law in the compound
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
Accepted: 12 February 2003
We have studied the evolution of the thermoelectric power S(T) with oxygen doping of single-layered thin films and ceramics in the overall superconducting (, ) phase diagram. While the universal relation between the room temperature thermopower and the critical temperature is found to hold in the strongly overdoped region , 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 – -based cuprates
© EDP Sciences, 2003
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