Low-temperature thermal transport in high-temperature superconducting Bi2Sr2CaCu2O8 via a Y-doped insulating analogue
R. Movshovich, E. G. Moshopoulou, P. Lin, M. B. Salamon, M. Jaime, M. F. Hundley, J. L. Sarrao
DOI 10.1103/PhysRevB.65.140506 · Physical Review B
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Abstract
In order to separate electronic and phonon mechanisms of thermal transport in high temperature superconducting Bi2Sr2CaCu2O8, we measured thermal conductivity of single crystals of Y-doped Bi2Sr2CaCu2O8, an insulating analog of pure Bi2Sr2CaCu2O8, in the temperature range between 40 mK and 2 K. Temperature dependence of the thermal conductivity of insulating samples changes from T1.7 between 1 and 2 K to T2.6 below 200 mK, indicating saturation of the phonon mean free path with decreasing temperature. Overall, thermal conductivity of the insulating samples (which is due entirely to phonons) is strongly suppressed in comparison to that of the superconducting samples. Therefore, a large (and at the lowest temperatures, predominant) part of the total thermal transport in superconducting Bi2Sr2CaCu2O8 is due to electrons.
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. | — | Pressure not reported | unknown |
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