| 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 | |
Failure of the empirical OCT law
in the 
compound
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
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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