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Thermal conductivity of polycrystalline YBa2Cu4O8
Umeå University, Faculty of Science and Technology, Physics.
Umeå University, Faculty of Science and Technology, Physics.
1994 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, Vol. 49, no 6, 4189-4198 p.Article in journal (Refereed) Published
Abstract [en]

We have measured the thermal conductivity κ and the thermal diffusivity a of a dense bulk ceramic polycrystalline sample of YBa2Cu4O8 (1:2:4) in the temperature range 30–300 K. We find κ≊10 W m-1 K-1 at 100 K, significantly higher than in ceramic YBa2Cu3O7-δ (1:2:3) and approaching the in-plane value for single-crystal 1:2:3, and decreasing to 7.6 W m-1 K-1 at 300 K. The data for this sample can be described by standard theories for phonon thermal conductivity of crystalline materials with boundary, phonon, and electron scattering. The higher κ in 1:2:4 as compared to 1:2:3 is, in this model, due to the smaller point defect scattering in the former. The fitted parameters for the three scattering mechanisms all agree with independent estimates based on simple models; inserting data for electric resistivity, grain size, carrier density, and lattice properties we can predict κ and its T dependence to within about 20%. We also discuss models for the phonon and electron thermal conductivities in some detail, including some second-order effects such as inelastic electron scattering and a T-dependent carrier density.

Place, publisher, year, edition, pages
1994. Vol. 49, no 6, 4189-4198 p.
Keyword [en]
Thermal conductivity, superconductor, ceramic, high transition temperature, electronic conduction, lattice conduction, electron-phonon interaction, phonon-phonon interaction, YBa2Cu4O8
National Category
Condensed Matter Physics
Research subject
URN: urn:nbn:se:umu:diva-26388DOI: 10.1103/PhysRevB.49.4189OAI: diva2:245925
Available from: 2009-10-08 Created: 2009-10-08 Last updated: 2010-02-01

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Andersson, Britt M.Sundqvist, Bertil
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