Failure of the empirical OCT law in the Bi2Sr2CuO6+d compound
Z. Konstantinovic, G. Le Bras, A. Forget, D. Colson, F. Jean, G., Collin, Z.Z. Li, H. Raffy, C. Ayache
TL;DR
This paper investigates how thermoelectric power varies with oxygen doping in Bi2Sr2CuO6+d, revealing the failure of the empirical OCT law in the underdoped regime and comparing results with other cuprates.
Contribution
It demonstrates the breakdown of the universal S290K-Tc relation in underdoped Bi2Sr2CuO6+d, challenging the applicability of the OCT law in this regime.
Findings
Universal relation holds in overdoped region
Strong violation observed in underdoped region
Comparison with other cuprates discussed
Abstract
We have studied the evolution of the thermoelectric power S(T) with oxygen doping of single-layered Bi2Sr2CuO6+d thin films and ceramics in the overall superconducting (Tc, S290K) phase diagram. While the universal relation between the room-temperature thermopower S290K and the critical temperature is found to hold in the strongly overdoped region (d>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.
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