Depression of superconductivity and the phonon-drag effect in glass-ceramic superconductors obtained by annealing the Fe-doped (Bi,Pb)4Sr3Ca3Cu4−mFemOx glassy precursor
S. Chatterjee, P. K. Pal, S. Bhattacharya, B. K. Chaudhuri
DOI 10.1103/PhysRevB.58.12427 · Physical Review B
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Abstract
Electrical conductivities and Seebeck coefficients of Fe-doped Bi-2212 type superconductors have been reported in the temperature range 300–10 K. These superconductors are obtained by annealing the Fe-doped amorphous Bi3PbSr3Ca3Cu4−mFemOx (m=0.0, 0.02, 0.04, 0.05, and 0.06) system around 840 °C for 40 h in air. The superconducting transition temperature Tc decreases continuously with a gradual increase of Fe content and finally diminishes for m>~0.06 supporting the Abrikosov-Gor’kov-type pair-breaking mechanism. Unlike undoped glass ceramics, semiconducting behavior exhibited by all the Fe-doped glass ceramics in their normal states can be explained by Mott’s variable range hopping model. The Seebeck coefficients (S) of the glass-ceramic superconductors showed interesting nonlinear variation with temperature. Such nonlinear variation of thermopower is considered to be associated with phonon-drag effect which is, however, not the case in undoped (Fe free) glass-ceramic superconductors. Formation of impurity bonds such as Cu-O-Fe, Fe-O-Fe, etc., is considered to be more important than the magnetic effect for the depression of Tc and nonlinear thermal variation of Seebeck coefficient (S) in these superconductors.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi3PbSr3Ca3Cu4Ox Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 80 | Pressure not reported | unknown |
| Bi3PbSr3Ca3Cu4-mFemOx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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