The structure of intercalated water in superconducting Na_0.35CoO₂⋅1.37D₂O: Implications for the superconducting phase diagram

2004/03/26 by D. N. Argyriou, C. J. Milne, Argyriou, D. N. +17
Physics and Astronomy · #FOS: Physical sciences #Strongly Correlated Electrons (cond-mat.str-el) #Superconductivity (cond-mat.supr-con) #cond-mat.str-el #cond-mat.supr-con

paper · pdf · doi:10.48550/arxiv.cond-mat/0403661

4 pages, 3 figures

arxiv created 2004/03/26 · arxiv updated 2009/12/01

Abstract

We have used electron and neutron powder diffraction to elucidate the structural properties of superconducting \NaD. Our measurements show that our superconducting sample exhbits a number of supercells ranging from 1/3a^* to 1/15a^*, but the most predominant one, observed also in the neutron data, is a double hexagonal cell with dimensions \dhx. Rietveld analysis reveals that \deut\space is inserted between CoO₂ sheets as to form a layered network of NaO₆ triangular prisms. Our model removes the need to invoke a 5K superconducting point compound and suggests that a solid solution of Na is possible within a constant amount of water y.

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