Thumbnail
Access Restriction
Open

Author Suleiman, B. M. ♦ Boerjesson, L. ♦ Berastegui, P.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PHYSICS ♦ HIGH-TC SUPERCONDUCTORS ♦ THERMAL CONDUCTIVITY ♦ YTTRIUM OXIDES ♦ BARIUM OXIDES ♦ COPPER OXIDES ♦ COBALT ADDITIONS ♦ ELECTRIC CONDUCTIVITY ♦ TEMPERATURE RANGE 0013-0065 K ♦ TEMPERATURE RANGE 0065-0273 K ♦ TEMPERATURE RANGE 0273-0400 K ♦ PHONONS ♦ COLLECTIVE EXCITATIONS
Abstract 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.}
ISSN 01631829
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-03-01
Publisher Place United States
Journal Physical Review, B: Condensed Matter
Volume Number 53
Issue Number 9


Open content in new tab

   Open content in new tab