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Electrical and thermal properties of bulk superconductors Eu0.95Pr0.05Ba2(Cu1�xMx)3O7�d (M = Fe, Ni, Zn and Mn)

Chakraborty, Tirthankar and Gahtori, Bhaskar 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 (2010) Electrical and thermal properties of bulk superconductors Eu0.95Pr0.05Ba2(Cu1�xMx)3O7�d (M = Fe, Ni, Zn and Mn). Journal of Physica C, 470 (3). 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�d (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�d (Eu-123) exhibits a pronounced hump below the superconducting transition temperature TC. However, the peak height of the hump decreases with Prdoping 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
Uncontrolled Keywords: A. High TC superconductors D. Critical field C. Transport properties D. Specific heat
Subjects: Engineering > MIT Manipal > Physics
Depositing User: MIT Library
Date Deposited: 07 Mar 2014 11:27
Last Modified: 07 Mar 2014 11:27
URI: http://eprints.manipal.edu/id/eprint/139041

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