Low temperature phonon thermal conductivity of the quasi-one-dimensional compounds (NbSe4)3I, (TaSe4)2I and K0.3MoO3 |
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| Authors: | A. Smontara J. C. Lasjaunias M. Apostol |
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| Affiliation: | (1) Centre de Recherches sur les Très Basses Températures, C.N.R.S., Laboratoire associé à l'Université Joseph Fourier, BP 166, 38042 GRENOBLE-Cèdex 9, France;(2) Present address: Institute of Physics of the University, P.O. Box 304, 41001 Zagreb, Croatia;(3) Present address: Department of Theoretical Physics, Institute for Atomic Physics, Magurele-Bucharest, Romania |
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| Abstract: | We report on measurements of the thermal conductivity of quasi-one-dimensional compounds K0.3MoO3, (NbSe4)3I, and (TaSe4)2I between 0.07K and 4 K. Despite the presence of a charge-density wave, the observed behaviour is similar to that expected in good insulating crystals, where the thermal conductivity well below 1 K is mainly governed by boundary scattering with some degree of specular reflection. However a pronounced anomaly is detected in (TaSe4)2I as a sharp maximum around 1 K, followed by a broad minimum around 3 K. We ascribe this anomaly to strong scattering by low-lying transverse acoustic phonons, with a very weak dispersion over a large part of the Brillouin zone, lying at an unusually low frequency. |
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