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Sodium ion ordering and vacancy cluster formation in NaxCoO2 (x=0.71 and 0.84) single crystals by synchrotron X-Ray diffraction
Authors:Chou F C  Chu M -W  Shu G J  Huang F-T  Pai Woei Wu  Sheu H S  Lee Patrick A
Institution:Center for Condensed Matter Sciences, National Taiwan University, Taipei, Taiwan. fcchou@ntu.edu.tw
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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