Sodium ion ordering and vacancy cluster formation in NaxCoO2 (x=0.71 and 0.84) single crystals by synchrotron X-Ray diffraction |
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Authors: | Chou F C Chu M -W Shu G J Huang F-T Pai Woei Wu Sheu H S Lee Patrick A |
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Institution: | Center for Condensed Matter Sciences, National Taiwan University, Taipei, Taiwan. fcchou@ntu.edu.tw |
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Abstract: | In the rich phase diagram of NaxCoO2, x=0.71 enjoys special stability and is called the Curie-Weiss metal due to its anomalous properties. Similarly, x=0.84 prepared from high temperature melt is a special end point beyond which the system phase separates. Using synchrotron x-ray diffraction on single crystals, we discovered sqrt12]a and sqrt13]a superlattice structures which we interpret as the ordering of Na (vacancy) clusters. These results lead to a picture of coexisting local moments and itinerant carriers and form the first step towards understanding the many anomalous properties of cobaltates. |
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