Anisotropic thermoelectric properties associated with dimensional crossover in quasi-one-dimensional SrNbO3.4+d (d∼0.03)

W. Kobayashi, Y. Hayashi, M. Matsushita, Y. Yamamoto, I. Terasaki, A. Nakao, H. Nakao, Y. Murakami, Y. Moritomo, H. Yamauchi, M. Karppinen

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Abstract

We have grown large single crystals of SrNbO3.4+d (d∼0.03) with n=5 in the homologous series SrnNbnO3n+2 by using a traveling solvent floating-zone method and measured resistivity, thermopower, and thermal conductivity along all crystallographic axes. The thermoelectric properties are found to be highly anisotropic, which reflects a quasi-one-dimensional electronic structure. In particular, the thermopower along the b axis is -170 μV/K at 300 K, which is 1 order of magnitude higher than the -15 μV/K along the a axis and -25 μV/K along the c axis. A possible origin of the high anisotropy in the thermopower is discussed in terms of dimensional crossover associated with a structural modification.

Original languageEnglish
Article number085118
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume84
Issue number8
DOIs
Publication statusPublished - 2011 Aug 23

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Kobayashi, W., Hayashi, Y., Matsushita, M., Yamamoto, Y., Terasaki, I., Nakao, A., Nakao, H., Murakami, Y., Moritomo, Y., Yamauchi, H., & Karppinen, M. (2011). Anisotropic thermoelectric properties associated with dimensional crossover in quasi-one-dimensional SrNbO3.4+d (d∼0.03). Physical Review B - Condensed Matter and Materials Physics, 84(8), [085118]. https://doi.org/10.1103/PhysRevB.84.085118