Effect of cobalt doping on thermal conductivity of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} superconductor
- Material Physics Laboratory, Department of Physics, Chalmers University of Technology, S-41296 Gothenburg (Sweden)
- Department of Physics, The Royal Institute of Technology, S-10044 Stockholm (Sweden)
- Department of Inorganic Chemistry, Chalmers University of Technology, S-41296 Gothenburg (Sweden)
The thermal conductivity of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} and YBa{sub 2}Cu{sub 3{minus}{ital x}}Co{sub {ital x}}O{sub 7{minus}{delta}} ({ital 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 {ital T}{sub {ital c}} 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 2{Delta}({ital T}). {copyright} {ital 1996 The American Physical Society.}
- OSTI ID:
- 279109
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 53, Issue 9; Other Information: PBD: Mar 1996
- Country of Publication:
- United States
- Language:
- English
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