Abstract
Sodium tungsten bronze Na x WO3 with cubic structure is reported to exhibit bulk superconductivity at sodium content 0.16≤x≤0.4. The superconducting transition temperatureT c and the temperature dependence of the critical fieldH c2 have been measured for the samples with different x. It was concluded that the enhancement ofT c at low x-values occurs due to softening of the phonon spectrum. The possible reason for positive curvature of theH c2 vsT curve is discussed.
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This work was supported by the Russian State Program on High-T c Superconductivity under Grant 94045.
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Garif'yanov, N.N., Khlebnikov, S.Y., Khlebnikov, I.S. et al. Superconductivity of sodium tungsten bronze with cubic structure. Czech J Phys 46 (Suppl 2), 855–856 (1996). https://doi.org/10.1007/BF02583735
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DOI: https://doi.org/10.1007/BF02583735