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Effect of Cr doping on the electrical conductivity and Seebeck coefficient in the superconductors obtained from the Bi–Pb–Sr–Ca–Cu–Cr–O-type glassy precursors by annealing

Published online by Cambridge University Press:  31 January 2011

H. K. Barik ,
S. K. Ghorai ,
S. Bhattacharya ,
D. Kilian  and
B. K. Chaudhuri
H. K. Barik
Affiliation:
Solid State Physics Department, Indian Association for the Cultivation of Science, Calcutta-700032, India
S. K. Ghorai
Affiliation:
Solid State Physics Department, Indian Association for the Cultivation of Science, Calcutta-700032, India
S. Bhattacharya
Affiliation:
Solid State Physics Department, Indian Association for the Cultivation of Science, Calcutta-700032, India
D. Kilian
Affiliation:
Institute of Physical Chemistry, Technical University Darmstadt, D-64287 Darmstadt, Germany
B. K. Chaudhuri
Affiliation:
Solid State Physics Department, Indian Association for the Cultivation of Science, Calcutta-700032, India
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Abstract

Homogenous (Bi3Pb)Sr3Ca3 (Cu4−nCrn)Ox (n 4 0 to 0.20) type glassy precursors become high-Tc superconductors by annealing at 840 °C. The suppression of Tc with increase of Cr concentration supports the pair-breaking mechanism. The feeble semiconducting behavior shown by the doped samples above their respective Tc values followed Mott's variable range hopping conduction mechanism. Like Ti- and Fe-doped samples, studied earlier, the thermoelectric power (TEP) of the present Cr-containing sample showed small positive peak above Tc, which was considered to be associated with the phonon-drag effect. The linear part of the temperature-dependent TEP (above Tc) well fitted the two-band model.

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Articles
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Journal of Materials Research , Volume 15 , Issue 5 , May 2000 , pp. 1076 - 1082
Copyright
Copyright © Materials Research Society 2000

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