Browsing by Author "Nakao, A."

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    Anisotropic thermoelectric properties associated with dimensional crossover in quasi-one-dimensional SrNbO3.4+d(d~0.03)
    (American Physical Society (APS), 2011) Kobayashi, W.; Hayashi, Y.; Matsushita, M.; Yamamoto, Y.; Terasaki, I.; Nakao, A.; Nakao, H.; Murakami, Y.; Moritomo, Y.; Yamauchi, H.; Karppinen, Maarit; Kemian laitos; Department of Chemistry; Kemian tekniikan korkeakoulu; School of Chemical Technology
    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.