Awana, V. P. S. and Bains, Jagdish Kumar and Okram, G. S. and Soni, Ajay and Ahluwalia, P. K. and Kishan, H. (2009) Anomalous thermoelectric power of overdoped Bi2Sr2CaCu2O8 superconductor. Journal of Applied Physics, 106 (9). 096102-1. ISSN 1089-7550

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Abstract

All the samples possess single-phase character and their superconducting transition temperatures (TcR = 0) are 85, 90, and 72 K, respectively for Bi2212-MQ, Bi2212-N2, and Bi2212-O2. Though the Bi2212-MQ and Bi2212-N2 samples are in near optimum doping regime, the Bi2212-O2 is an overdoped sample. TcS = 0 values obtained through S(T) data are also in line with those determined from the temperature dependence of resistance (TcR = 0) and dc magnetization (Tcdia). Interestingly, S(T) behavior of the optimally doped Bi2212-MQ and Bi2212-N2 samples is seen to be positive in whole temperature range, the same is found negative for the overdoped Bi2212-O2 sample above TcS = 0. This anomalous S(T) behavior is seen in the light of the recent band structure calculations and the ensuing split Fermi surface as determined by angle-resolved photoelectron spectroscopy.

Item Type:	Article
Subjects:	Physics
Divisions:	UNSPECIFIED
Depositing User:	Ms Neetu Chandra
Date Deposited:	13 Aug 2012 11:54
Last Modified:	13 Aug 2012 11:54
URI:	http://npl.csircentral.net/id/eprint/403

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