Bains, Jagdish Kumar and Mudgel, Monika and Okram, G. S. and Soni, Ajay and Awana, V. P. S. and Ahluwalia, P. K. and Saxena, R. B. and Kishan, H. (2009) Negative thermoelectric power of over-doped Bi2Sr2CaCu2O8 superconductor. Physica C: Superconductivity, 470 (Supp-1). S203-S204. ISSN 0921-4534

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Abstract

The thermoelectric power S(T) studies of Bi2Sr2CaCu2O8 (Bi2212) samples, including as-processed Partially Melted (Bi2212-PM) and 800 °C O2-annealed (Bi2212-O2) are reported here. While Bi2212-PM sample is near optimum doping regime, Bi2212-O2 is an over-doped sample. View the MathML source values obtained through S(T) data match very well with those deduced from the R(T). Interestingly, S(T) behavior of the optimally-doped Bi2212-PM sample is seen to be positive in whole temperature range, it is found negative for the over-doped Bi2212-O2 sample above View the MathML source. The observed negative S(T) dependence of the over-doped Bi2212-O2 is in accord with the recent band structure calculations and is in line with the theoretical investigations on a van Hove singularity in electronic density of states in HTSc compounds.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s Elsevier B.V.
Uncontrolled Keywords:	Bi2212; Thermoelectric power; Resistivity
Subjects:	Physics
Divisions:	UNSPECIFIED
Depositing User:	Ms Neetu Chandra
Date Deposited:	13 Jun 2012 11:25
Last Modified:	13 Jun 2012 11:25
URI:	http://npl.csircentral.net/id/eprint/259

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