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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.Peer reviewe

physical review. b, condensed matter and materials physics

Anisotropic thermoelectric properties associated with dimensional crossover in quasi-one-dimensional SrNbO<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mrow><mml:mn>3.4</mml:mn><mml:mo>+</mml:mo><mml:mi>d</mml:mi></mml:mrow></mml:msub></mml:math>(<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>d</mml:mi><mml:mo>∼</mml:mo><mml:mn>0.03</mml:mn></mml:mrow></mml:math>)

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