Effect of cobalt doping on thermal conductivity of YBa2Cu3O7−δ superconductor
B. M. Suleiman, L. Börjesson, P. Berastegui
DOI 10.1103/PhysRevB.53.5901 · Physical Review B
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Abstract
The thermal conductivity of YBa2Cu3O7−δ and YBa2Cu3−xCoxO7−δ(x=0.1) sintered compounds has been measured to investigate the effect of Co doping on the thermal conduction processes. The measurements were performed using the transient-plane-source technique. The thermal conductivity of the doped sample qualitatively resembles that of the corresponding undoped sample, but with values a factor of 2 lower. This decrease in thermal conductivity is attributed to scattering mechanisms due to enhancement of the microstructural imperfections and the decoupling between the conducting Cu-O planes as a result of Co-doping in the chain sites. An attempt was made to interpret the peak of the thermal conductivity below Tc in terms of a theoretical model based on weakly damped collective electron excitations of the Bose type, with an acoustic dispersion relation (acoustic plasmons), inside the superconducting gap 2Δ(T).
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O6.9 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 91 | Pressure not reported | midpoint |
| YBa2Cu2.9Co0.1O6.9 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 74 | Pressure not reported | midpoint |
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