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Thermal conductivity of YBa2Cu4O8 under high pressure
Umeå University, Faculty of Science and Technology, Physics.
Umeå University, Faculty of Science and Technology, Physics.
1993 (English)In: Physica. C, Superconductivity, ISSN 0921-4534, Vol. 216, no 1-2, 187-194 p.Article in journal (Refereed) Published
Abstract [en]

The thermal diffusivity a of YBa2Cu4O8 (1-2-4) has been measured as a function of pressure p and temperature T over the range 85<T<310 K and up to 1 GPa (10 kbar). From the data obtained we have calculated the pressure dependence of the thermal conductivity κ as a function of T. κ increases slowly with increasing p above 150 K but decreases below this value. Most of the high-T increase with p is caused by an increase in the electronic thermal conductivity κe. For the phonon thermal conductivity, which dominates κ in 1-2-4, we find that charge transfer with p causes a strong increase in electron-phonon scattering with p, while the p dependence of the boundary scattering and phonon-phonon scattering is in reasonable agreement with the behaviour predicted by simple models.

Place, publisher, year, edition, pages
Elsevier B.V. , 1993. Vol. 216, no 1-2, 187-194 p.
Keyword [en]
Thermal conductivity, high pressure, superconductor, YBa2Cu4O8, 1-2-4, ceramic, phonon transport, electron-phonon scattering, impurity scattering, charge transfer, thermal diffusivity
National Category
Condensed Matter Physics Condensed Matter Physics
Research subject
URN: urn:nbn:se:umu:diva-26538DOI: 10.1016/0921-4534(93)90652-7OAI: diva2:271921
Available from: 2009-10-13 Created: 2009-10-13 Last updated: 2010-02-01

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Andersson, Britt M.Sundqvist, Bertil
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