Defects and the thermal conductivity of YBa2Cu3O7-d and YBa2Cu4O8

Editors: J. Dumas, H.W. Neumüller, H.F. Braun, V.P. Seminozhenko, and Yu.D. Tretyakov. The journal paper (ISSN above) has also been reprinted in a conference book as European Materials Research Society Symposium Proceedings volume 38: Proceedings of Symposium A on High Tc Superconductors of the 1992 E-MRS Fall Conference, Strasbourg (ISBN given above), with the same pagination.
We present below the first measured data for the thermal diffusivity and the thermal conductivity, λ, of dense, sintered ceramic YBa2Cu4O8 (1-2-4) as a function of temperature T between 40 and 310 K. At 300 K, λ is 6.3 Wm−1K−1, increasing with decreasing T to about 9.5 Wm−1K−1 near Tc. This T dependence is much stronger than in YBa2Cu3O7−δ (1-2-3). Only a very small enhancement is observed in λ below Tc. As in 1-2-3, λ is mainly limited by phonon scattering by defects.

Sundqvist, BertilUmeå universitet,Institutionen för fysik(Swepub:umu)besu0001 (author)
Umeå universitetInstitutionen för fysik (creator_code:org_t)

In:Journal of Alloys and Compounds, volume 195: Elsevier Sequoia S.A., s. 655-6580 444 81529 5

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NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Condensed Matter ...

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