Origin of superconductivity in tungsten thin films
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arXiv
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866929285723324416 |
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| author | Bagwe, Vivas Duhan, Rishabh Chalke, Bhagyashree Parmar, Jayesh Basistha, Somak Raychaudhuri, Pratap |
| author_facet | Bagwe, Vivas Duhan, Rishabh Chalke, Bhagyashree Parmar, Jayesh Basistha, Somak Raychaudhuri, Pratap |
| contents | The most common allotrope of tungsten, α-W, has a superconducting transition at a temperature of ~11 mK. However, two other forms of tungsten have been reported to have superconducting transitions in the temperature range Tc ~ 2-5 K when synthesized as thin films: Crystalline \b{eta}-W and amorphous W (a-W). In this work we carry out a systematic study of W films synthesized using d.c. magnetron sputtering, using transport, low frequency magnetic shielding response, and transmission electron microscopy. Our results show that while a-W is indeed a bulk superconductor, superconductivity in \b{eta}-W probably originates from an amorphous phase that forms along with the \b{eta}-W phase. Our findings reconcile some of the anomalies earlier reported in \b{eta}-W, such the very small superconducting gap and the decrease of Tc with increase in film thickness. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2312_10368 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Origin of superconductivity in tungsten thin films Bagwe, Vivas Duhan, Rishabh Chalke, Bhagyashree Parmar, Jayesh Basistha, Somak Raychaudhuri, Pratap Superconductivity Materials Science The most common allotrope of tungsten, α-W, has a superconducting transition at a temperature of ~11 mK. However, two other forms of tungsten have been reported to have superconducting transitions in the temperature range Tc ~ 2-5 K when synthesized as thin films: Crystalline \b{eta}-W and amorphous W (a-W). In this work we carry out a systematic study of W films synthesized using d.c. magnetron sputtering, using transport, low frequency magnetic shielding response, and transmission electron microscopy. Our results show that while a-W is indeed a bulk superconductor, superconductivity in \b{eta}-W probably originates from an amorphous phase that forms along with the \b{eta}-W phase. Our findings reconcile some of the anomalies earlier reported in \b{eta}-W, such the very small superconducting gap and the decrease of Tc with increase in film thickness. |
| title | Origin of superconductivity in tungsten thin films |
| topic | Superconductivity Materials Science |
| url | https://arxiv.org/abs/2312.10368 |