Origin of superconductivity in disordered tungsten thin films
Vivas Bagwe, Rishabh Duhan, Bhagyashree Chalke, Jayesh Parmar, Somak Basistha, Pratap Raychaudhuri
DOI 10.1103/PhysRevB.109.104519 · Physical Review B
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Abstract
The most common allotrope of tungsten, α−W, has a superconducting transition at a temperature of ∼11mK. However, two other forms of tungsten have been reported to have superconducting transitions in the temperature range Tc∼2−5K when synthesized as thin films: crystalline β−W and amorphous W (a−W). In this work we carry out a systematic study of W films synthesized using dc magnetron sputtering, using transport, low frequency magnetic shielding response, and transmission electron microscopy. Our results show that while a−W is indeed a conventional superconductor, β−W is not a superconductor down to 2.3 K. Superconductivity with Tc>3K in the putative β−W films probably originates from an amorphous phase that forms underneath the β−W phase. Our findings reconcile some of the anomalies earlier reported in β−W, such as the very small superconducting gap and the decrease of Tc with increase in film thickness.
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