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

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Thermoelectric power
Magnetoresistance
electric power
Superconducting materials
Specific heat
Thermal conductivity
thermal conductivity
Doping (additives)
specific heat
heat
Superconducting transition temperature
Thermal variables measurement
High temperature superconductors
Transport properties
transition temperature
Electrons
high temperature superconductors
transport properties
Hot Temperature
electrons

All Science Journal Classification (ASJC) codes

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

Cite this

Chakraborty, Tirthankar ; Gahtori, Bhasker ; Soni, Ajay ; Okram, G. S. ; Agrawal, S. K. ; Chen, S. Y. ; Kuo, Y. K. ; Ahsan, M. A.H. ; Rao, Ashok. / 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). In: Solid State Communications. 2011 ; Vol. 151, No. 17. pp. 1117-1121.
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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). / Chakraborty, Tirthankar; Gahtori, Bhasker; Soni, Ajay; Okram, G. S.; Agrawal, S. K.; Chen, S. Y.; Kuo, Y. K.; Ahsan, M. A.H.; Rao, Ashok.

In: Solid State Communications, Vol. 151, No. 17, 01.09.2011, p. 1117-1121.

Research output: Contribution to journalArticle

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AU - Gahtori, Bhasker

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AU - Okram, G. S.

AU - Agrawal, S. K.

AU - Chen, S. Y.

AU - Kuo, Y. K.

AU - Ahsan, M. A.H.

AU - Rao, Ashok

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AB - 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.

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