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Thermal conductivity of bulk YBa2Cu4O8 and the phonon transport model
Umeå University, Faculty of Science and Technology, Physics.
Umeå University, Faculty of Science and Technology, Physics.
1994 (English)In: Physica C, volume 235-240: Proceedings of the 4th International Conference on Materials and Mechanisms of Superconductivity: High-Temperature Superconductors (M2S HTSC IV), Grenoble 1994, part II, Elsevier Science B.V. , 1994, 1377-1378 p.Conference paper (Refereed)
Abstract [en]

We have measured the thermal conductivity varkappa of bulk YBa2Cu4O8 (1-2-4) between 30 and 310 K and at pressures p up to 1 GPa. At p = 0, varkappa = 10 Wm−1K−1 near 100 K, twice that of sintered YBa2Cu3O−δ (1-2-3). varkappa also decreases with increasing T more rapidly than in 1-2-3, to 7.4 Wm−1K−1 at 300 K. Under pressure, varkappa increases slowly with p above 150 K, but dvarkappa/dp decreases at lower T. Our results are in excellent agreement with a semi-classical model for phonon thermal conductivity, provided we assume significant charge transfer with pressure. The calculated phonon mean free path is much larger than the lattice spacing at all T.

Place, publisher, year, edition, pages
Elsevier Science B.V. , 1994. 1377-1378 p.
, Physica C, superconductivity, ISSN 0921-4534 ; volumes 235-240
Keyword [en]
Thermal conductivity, superconductivity, High transition temperature superconductor, HTS, HiTc, high pressure, YBa2Cu4O8, phonon transport, electron-phonon interaction, charge transfer
National Category
Condensed Matter Physics Condensed Matter Physics
Research subject
URN: urn:nbn:se:umu:diva-26416DOI: 10.1016/0921-4534(94)91913-5OAI: diva2:248847
Editor: P. WyderAvailable from: 2009-10-09 Created: 2009-10-09 Last updated: 2010-02-01

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Sundqvist, BertilAndersson, Britt M.
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