Fluctuation-enhanced conductivity in the Sb-doped Bi-Pb-Sr-Ca-Cu-O superconducting system
R. K. Nkum, W. R. Datars
DOI 10.1103/PhysRevB.44.12516 · Physical Review B
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Abstract
Fluctuations above the transition temperature in the Sb-doped 2:2:2:3 Bi-Pb-Sr-Ca-Cu-O compounds have been studied. The excess conductivity above Tc was determined from both the normal metal and the Anderson-Zou fits to the normal-state resistivity. With use of Aslamazov-Larkin theory, the dimensionality of the materials was determined. The value of the critical exponent (λ=-1) obtained from the experimental excess conductivity clearly indicates that the superconductivity in the Sb-doped (Bi,Pb)-based system is of a two-dimensional nature. From the fluctuation-enhanced conductivity, a coherence length of 7.9±0.8 Å was obtained for the samples, in good agreement with values obtained from magnetization curves of polycrystalline Bi-Sr-Ca-Cu-O superconductors. The fit of the Anderson-Zou model indicates that, although the crystallites in the polycrystalline samples are randomly oriented, the resistivity in the a-b plane dominates in the equivalent parallel resistor network.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi1.9Sb0.1Sr2Ca2Cu3O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 132 | Pressure not reported | zero_resistance |
| Bi1.7Pb0.3Sb0.05Sr2Ca2Cu3.6Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 107 | Pressure not reported | onset |
| Bi1.7Pb0.3Sb0.1Sr2Ca2Cu3.6Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 109 | Pressure not reported | onset |
| Bi1.7Pb0.3Sb0.05Sr2Ca2Cu3.6Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Bi1.7Pb0.3Sb0.1Sr2Ca2Cu3.6Oy 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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