Anisotropic transport in the quasi-one-dimensional semiconductor Li0.33MoO3

作者：Moshfeghyeganeh S; Cote A N; Neumeier J J; Cohn J L^*

来源：Journal of Applied Physics, 2016, 119(9): 095105.

DOI：10.1063/1.4943071

Transport measurements (electrical resistivity, Seebeck coefficient, and thermal conductivity) in the temperature range 80-500K are presented for single crystals of the quasi-one-dimensional (Q1D) semiconductor Li0.33MoO3. Opposite signs are observed for the Seebeck coefficient along the trinclinic a and c axes, with S-c S-a similar or equal to 250 mu V/K near room temperature and similar or equal to 100 mu V/K at 380 K. The thermal conductivity at room temperature in the a-c planes was similar to 2W/m K and similar to 10 times smaller along b*. A weak structural anomaly at T-s approximate to 355 K, identified in the temperature-dependent lattice constants, coincides with anomalies in the electrical properties. Analysis of the electronic transport at T > T-s favors an intrinsic semiconductor picture for transport along the most conducting Q1D axis and small-polaronic transport along the other directions, providing insight into the origin of the Seebeck anisotropy.

• 出版日期2016-3-7