Website abstract bibtex

We report on thermal conductivity measurements of the quasi-onedimensional single crystals (Ta1-xNbxSe4)2I (x = 0, 0.008, 0.01) between 50 mK and 6 K. The thermal conductivity of a (TaSe4)2I sample obeys a cubic variation below 0.8 K, in good agreement with the boundary scattering regime. For two Nb doped samples, the thermal conductivity between 0.1 K and 1 K obeys a quasiquadratic regime, which is ascribed to extended "linear or planar defects," specific to this one-dimensional structure, and introduced either by doping or by successive thermal cycling, while it obeys a cubic variation below 0.1K, as in the case of pure (TaSe4)2I. In the vicinity of 1 K and 2 K for pure and 1 at. % Nb doped samples, thermal conductivity shows a very sharp peak, which exceeds the low-temperature cubic boundary Casimir regime, or the quasi quadratic regime, respectively. The presence of the peak in these systems is explained by a phonon Poiseuille flow, originating from their strong anharmonicity, amplified by the lattice anisotropy.

@article{ title = {Low-Temperature Phonon Thermal Conductivity of the Quasi-Onedimensional Single Crystals (Ta1−xNbxSe4)2I}, type = {article}, year = {1998}, identifiers = {[object Object]}, pages = {815-840}, volume = {111}, websites = {http://link.springer.com/10.1023/A:1022273107580}, id = {86700b59-1d8a-3ea3-99bc-cdcddc2cd3ad}, created = {2016-12-06T12:07:40.000Z}, file_attached = {false}, profile_id = {12182ba0-f80b-33ff-8da5-1813b38b682d}, group_id = {49ce86ba-a52a-36eb-a7fb-9e42f732edd5}, last_modified = {2017-03-14T17:25:32.499Z}, read = {false}, starred = {false}, authored = {false}, confirmed = {true}, hidden = {false}, citation_key = {Smontara1998}, source_type = {article}, private_publication = {false}, abstract = {We report on thermal conductivity measurements of the quasi-onedimensional single crystals (Ta1-xNbxSe4)2I (x = 0, 0.008, 0.01) between 50 mK and 6 K. The thermal conductivity of a (TaSe4)2I sample obeys a cubic variation below 0.8 K, in good agreement with the boundary scattering regime. For two Nb doped samples, the thermal conductivity between 0.1 K and 1 K obeys a quasiquadratic regime, which is ascribed to extended "linear or planar defects," specific to this one-dimensional structure, and introduced either by doping or by successive thermal cycling, while it obeys a cubic variation below 0.1K, as in the case of pure (TaSe4)2I. In the vicinity of 1 K and 2 K for pure and 1 at. % Nb doped samples, thermal conductivity shows a very sharp peak, which exceeds the low-temperature cubic boundary Casimir regime, or the quasi quadratic regime, respectively. The presence of the peak in these systems is explained by a phonon Poiseuille flow, originating from their strong anharmonicity, amplified by the lattice anisotropy.}, bibtype = {article}, author = {Smontara, A and Lasjaunias, J.-C. and Maynard, R and Berger, H and Lévy, F}, journal = {Journal of Low Temperature Physics}, number = {5/6} }

Downloads: 0