Magneto-resistance, thermal conductivity, thermo-electric power and specific heat of superconductor Gd0.95Pr0.05Ba 2Cu2.94M0.06O7-δ (M=Fe, Ni, Zn and Mn)

Tirthankar Chakraborty, Bhasker Gahtori, Ajay Soni, G. S. Okram, S. K. Agrawal, S. Y. Chen, Y. K. Kuo, M. A.H. Ahsan, Ashok Rao

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Abstract

In the present paper, we present thermal and electrical transport properties of pristine and co-doped samples of high temperature superconductors Gd0.95Pr0.05Ba2Cu2.94M 0.06O7-δ. It is found that all the samples, except the Mn co-doped sample, show metallic behavior in the normal state. It is observed that the upper critical field has a correlation with the substituent site of the co-dopant. Thermal conductivity κ(T) of all the samples, except the one with Zn co-doping, exhibits a hump like structure around their respective transition temperatures. A negative sign of the measured thermo-power (S) in Gd-123 indicates that electron-like carriers dominate the heat transport in the pristine sample; whereas a sign reversal in S, as a consequence of the change of dominant carrier upon doping, is observed. Specific heat ( CP) measurements show a jump around the transition temperature ( TC) for the pristine sample, however, such a jump in CP is strongly suppressed for the doped samples.

Original languageEnglish
Pages (from-to)1117-1121
Number of pages5
JournalSolid State Communications
Volume151
Issue number17
DOIs
Publication statusPublished - 01-09-2011

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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