Abstract:
A possible new high temperature superconducting phase was recently reported in WO 3 :Na. We have examined the reaction between sodium vapour and WO 3 , and compared the phases formed by the reaction to previously known WO 3 phases. By using light microscopy and electron microprobe analysis, domain walls from the interior of the crystal are shown to have a much higher Na content than bulk material after reaction with Na vapour. This indicates preferential transport along the domain walls. The result is very similar to a reduction reaction of WO 3 crystals in which twin walls lose oxygen preferentially. Oxygen deficient twin walls are superconducting with .
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Received 3 September 1999 and Received in final form 15 December 1999
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Aird, A., Salje, E. Enhanced reactivity of domain walls in with sodium. Eur. Phys. J. B 15, 205–210 (2000). https://doi.org/10.1007/PL00011037
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DOI: https://doi.org/10.1007/PL00011037