Structural features and transport properties of iodine intercalated misfit layer [BiCaO/sub 2/]/sub 2/[CoO/sub 2/]/sub 1.69/ single crystals

E. Guilmeau, M. Pollet, D. Grebille, M. Hervieu, H. Muguerra, R. Cloots, M. Mikami, R. Funahashi
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引用次数: 0

Abstract

The thermopower and the electrical resistivity of [BiCaO/sub 2/]/sub 2/[CoO/sub 2/]/sub 1.69/ and corresponding iodine intercalated single crystals have been measured. Upon intercalation, the thermopower is drastically decreased, indicating that there is a hole doping by charge transfer from the intercalated iodine layer to the hexagonal CoO/sub 2/ layer. The resistivity is increased due to stacking faults and disordered structures. Structural analyses confirmed the stacking scheme along the c direction, with the localisation of iodine between the [BiO] double layers. The effect of intercalation on the thermoelectric properties suggested discussions from the view point of hole doping and nano-block layer coupling effect.
碘嵌入错配层[BiCaO/sub 2/]/sub 2/[CoO/sub 2/]/sub 1.69/单晶的结构特征及输运性质
测定了[BiCaO/sub 2/]/sub 2/[CoO/sub 2/]/sub 1.69/和相应的碘插层单晶的热功率和电阻率。插入后,热功率急剧下降,表明从插入碘层到六方CoO/sub 2/层发生了电荷转移的空穴掺杂。由于层错和结构紊乱,电阻率增加。结构分析证实了沿c方向的堆叠方案,碘定位在[BiO]双层之间。嵌层对热电性能的影响建议从空穴掺杂和纳米块层耦合效应的角度进行讨论。
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