Potentiometric method of estimating the critical temperature of the superconducting transition in high-Tc materials
Vladimir V. Gridin, W. R. Datars
DOI 10.1103/PhysRevB.43.3675 · Physical Review B
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Abstract
Two high-Tc superconducting polycrystalline materials with Tc≃108 and 74 K were used to study the temperature dependence of the electrical potential drops across ring samples with an outside diameter of 1.1 cm. Three diametrical pairs of leads were used to measure the longitudinal, VL (four-probe-like) and the transversal, VT (compensation-method-like) voltages of the samples. The temperature dependence of VT shows a knee structure (or a shallow minimum) in the vicinity of the fluctuation-corrected critical transition temperature Tc0, which is estimated from the analysis of the Aslamosov-Larkin paraconductivity term. No shallow minima were detected in the case of VL. Our method of finding the critical region involves no preliminary assumptions about the single- or multiple-layer character of the superconductivity in the materials studied.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi1.6Pb0.4Sr2Ca2Cu3Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 108.1 | Pressure not reported | onset |
| Bi1.8Pb0.1Ga0.1Sr2Ca2Cu3Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 74.4 | Pressure not reported | onset |
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