Specific heat and transport properties of UPt3

J.J.M. Franse1, A.A. Menovsky1, A. de Visser1, C. D. Bredl2, U. Gottwick2, W. Lieke2, H. M. Mayer2, U. Rauchschwalbe2, G. Sparn2, F. Steglich2
1Natuurkundig Laboratorium, Universiteit van Amsterdam, Amsterdam, The Netherlands
2Institut für Festkörperphysik, Technische Hochschule Darmstadt, Darmstadt, Federal Republic of Germany

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An upper limit of the phonon part to ? s (T) can be obtained by taking into account scattering of the phonons from grain boundaries only (?size effect?). Using the average grain size of 50 ?m as determined for our polycrystalline sample, we estimate that at the lowest temperature the phonons contribute only a few % to the heat transport in the superconducting state

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