Chakraborty, Tirthankar and Gahtori, Bhasker and Soni, Ajay and Okram, G. S. and Agarwal, S. K. and Chen, Y. S. and Kuo, Y. K. and -, Geetha and Rao, Ashok and Sarkar, Chandan Kumar (2010) Electrical and thermal properties of bulk superconductors Eu0.95Pr0.05Ba2(Cu1−xMx)3O7−δ (M = Fe, Ni, Zn and Mn). Physica C: Superconductivity, 470 (3). pp. 244-249. ISSN 0921-4534

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Abstract

Measurements of transition temperature, magneto-resistance, thermal conductivity, thermo-electric power and specific heat have been carried out on co-doped samples of Eu0.95Pr0.05Ba2(Cu1−xMx)3O7−δ (M = Fe, Ni, Zn and Mn) compounds. It is found that all samples exhibit metallic behavior, except the co-doped sample of Fe that shows semiconducting behavior. It is seen that the upper-critical field Hc2 decreases with Pr-doping. However, an increase in Hc2 for dopants like Fe and Mn is observed. Thermal conductivity for the pristine sample of EuBa2Cu3O7−δ (Eu-123) exhibits a pronounced hump below the superconducting transition temperature TC. However, the peak height of the hump decreases with Pr-doping and such a feature is further suppressed in the co-doped samples. The negative sign of the measured thermo-electric power of Eu-123 indicates that the dominant carrier in this sample is electron-like, whereas it turns to hole-like for all of the doped samples. A jump in specific heat CP is detected in the pure sample of Eu-123 at TC, while only a change in slope in CP is seen around the transition temperature in the Pr-doped sample.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s Elsevier B.V.
Uncontrolled Keywords:	High TC superconductors; Critical field; Transport properties; Specific heat
Subjects:	Physics
Divisions:	UNSPECIFIED
Depositing User:	Ms Neetu Chandra
Date Deposited:	11 Apr 2012 11:01
Last Modified:	11 Apr 2012 11:01
URI:	http://npl.csircentral.net/id/eprint/115

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