Abstract
Mixture of Na and WO3 at a molar ratio of 1:1 has been subjected to a shock-wave pressure of ≃ 20 kbar, followed by vacuum-encapsulating and quenching of the product to liquid nitrogen. The ac magnetic susceptibility of the samples has revealed metastable superconductivity with Tc ≈ 40 K. Comparison of the ac susceptibility measured at different magnetic fields and frequencies infers that the superconductivity arises within the weakly linked superconducting regions formed during the shock-wave pressure treatment.
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