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

Tirthankar Chakraborty, Bhasker Gahtori, Ajay Soni, G. S. Okram, S. K. Agarwal, Y. S. Chen, Y. K. Kuo, Geetha, Ashok Rao, Chandan Kumar Sarkar

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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.

Original languageEnglish
Pages (from-to)244-249
Number of pages6
JournalPhysica C: Superconductivity and its Applications
Volume470
Issue number3
DOIs
Publication statusPublished - 01-02-2010

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All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Electrical and Electronic Engineering
  • Energy Engineering and Power Technology
  • Electronic, Optical and Magnetic Materials

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