Abstract
The misfit cobaltite, [Bi 2 Ba 1 . 8 Co 0 . 2 O 4 ] R S [CoO 2 ] 2 , built up from the stacking of rocksalt-type layers (RS) and single hexagonal [CoO 2 ] layers (H), has been synthesized. This complex structure, described in a commensurate monoclinic supercell, exhibits a double commensurate modulation: a misfit modulation with b R S /b H =2 and an intrinsic modulation of the RS layers [q i =0.2(a R S +b R S )]. This oxide is characterized by an enhanced metallic behavior with respect to the misfit Bi(Pb)/Sr/Co/O cobaltites and in contrast to these compounds by a positive magnetoresistance and significantly smaller values of the thermoelectric power (<100 μV K - 1 ). A comparison of its behavior with those of Sr 2 RuO 4 and of the heavy-fermion-like oxide LiV 2 O 4 is presented.
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