Abstract
The superconducting transition temperatures have been measured for the tetragonal I phase of Na0.23WO3, the hexagonal phase of K0.33 WO3, and the hexagonal phase of Rb0.33WO3 for pressures up to 20,000 bar. The slope of the curves is + 1.7 × 10−5 K/bar for the sodium bronze, −5.8 × 10−5 K /bar for the potassium bronze, and −1.5 × 10−5 K/bar for the rubidium bronze. A sharp change in slope of the transition temperature vs. pressure curve for the potassium bronze at 4000 bar may indicate a phase change.
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Prepared for the U.S. Energy Research and Development Administration under Contract No. W-7405-eng-82.
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Bloom, D., Shanks, H.R., Barnes, J. et al. Pressure dependence of the superconducting transition temperature in alkali tungsten bronzes. J Low Temp Phys 23, 743–749 (1976). https://doi.org/10.1007/BF00116307
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DOI: https://doi.org/10.1007/BF00116307