Thermal conductivity of Bi-Sr-Ca-Cu-O superconductors: Correlation with the low-temperature specific-heat behavior
S. D. Peacor, C. Uher
DOI 10.1103/PhysRevB.39.11559 · Physical Review B
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Abstract
Thermal conductivity has been measured on Bi-Sr-Ca-Cu-O high-Tc superconductors down to 70 mK. Samples included a sintered specimen as well as two hot-pressed samples cut from the same ingot parallel and perpendicular, respectively, to the pressing direction. Below 3 K the thermal conductivities of all samples follow an approximately quadratic temperature variation with no indication of the limiting T-linear dependence typically observed for the superconducting state of Y-Ba-Cu-O and La-Sr-Cu-O ceramics. We discuss the apparent correlation between the occurrence or absence at low temperatures of a T-linear thermal conductivity and a T-linear (γ) term in the specific heat in all high-Tc superconducting ceramics.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 85 | Pressure not reported | onset |
| Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | zero_resistance |
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| La2-xSrxCuO4 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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