Substrate mediated nitridation of niobium into superconducting Nb2N thin films for phase slip study

Abstract Here we report a novel nitridation technique for transforming niobium into hexagonal Nb2N which appears to be superconducting below 1K. The nitridation is achieved by high temperature annealing of Nb films grown on Si3N4/Si (100) substrate under high vacuum. The structural characterization...

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Autores principales:	Bikash Gajar, Sachin Yadav, Deepika Sawle, Kamlesh K. Maurya, Anurag Gupta, R. P. Aloysius, Sangeeta Sahoo
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2019
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/7606c44e12774c2e94c53987c1bf1cd1
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spelling	oai:doaj.org-article:7606c44e12774c2e94c53987c1bf1cd12021-12-02T15:08:32ZSubstrate mediated nitridation of niobium into superconducting Nb2N thin films for phase slip study10.1038/s41598-019-45338-12045-2322https://doaj.org/article/7606c44e12774c2e94c53987c1bf1cd12019-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-019-45338-1https://doaj.org/toc/2045-2322Abstract Here we report a novel nitridation technique for transforming niobium into hexagonal Nb2N which appears to be superconducting below 1K. The nitridation is achieved by high temperature annealing of Nb films grown on Si3N4/Si (100) substrate under high vacuum. The structural characterization directs the formation of a majority Nb2N phase while the morphology shows granular nature of the films. The temperature dependent resistance measurements reveal a wide metal-to-superconductor transition featuring two distinct transition regions. The region close to the normal state varies strongly with the film thickness, whereas, the second region in the vicinity of the superconducting state remains almost unaltered but exhibiting resistive tailing. The current-voltage characteristics also display wide transition embedded with intermediate resistive states originated by phase slip lines. The transition width in current and the number of resistive steps depend on film thickness and they both increase with decrease in thickness. The broadening in transition width is explained by progressive establishment of superconductivity through proximity coupled superconducting nano-grains while finite size effects and quantum fluctuation may lead to the resistive tailing. Finally, by comparing with Nb control samples, we emphasize that Nb2N offers unconventional superconductivity with promises in the field of phase slip based device applications.Bikash GajarSachin YadavDeepika SawleKamlesh K. MauryaAnurag GuptaR. P. AloysiusSangeeta SahooNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 9, Iss 1, Pp 1-11 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Bikash Gajar Sachin Yadav Deepika Sawle Kamlesh K. Maurya Anurag Gupta R. P. Aloysius Sangeeta Sahoo Substrate mediated nitridation of niobium into superconducting Nb2N thin films for phase slip study
description	Abstract Here we report a novel nitridation technique for transforming niobium into hexagonal Nb2N which appears to be superconducting below 1K. The nitridation is achieved by high temperature annealing of Nb films grown on Si3N4/Si (100) substrate under high vacuum. The structural characterization directs the formation of a majority Nb2N phase while the morphology shows granular nature of the films. The temperature dependent resistance measurements reveal a wide metal-to-superconductor transition featuring two distinct transition regions. The region close to the normal state varies strongly with the film thickness, whereas, the second region in the vicinity of the superconducting state remains almost unaltered but exhibiting resistive tailing. The current-voltage characteristics also display wide transition embedded with intermediate resistive states originated by phase slip lines. The transition width in current and the number of resistive steps depend on film thickness and they both increase with decrease in thickness. The broadening in transition width is explained by progressive establishment of superconductivity through proximity coupled superconducting nano-grains while finite size effects and quantum fluctuation may lead to the resistive tailing. Finally, by comparing with Nb control samples, we emphasize that Nb2N offers unconventional superconductivity with promises in the field of phase slip based device applications.
format	article
author	Bikash Gajar Sachin Yadav Deepika Sawle Kamlesh K. Maurya Anurag Gupta R. P. Aloysius Sangeeta Sahoo
author_facet	Bikash Gajar Sachin Yadav Deepika Sawle Kamlesh K. Maurya Anurag Gupta R. P. Aloysius Sangeeta Sahoo
author_sort	Bikash Gajar
title	Substrate mediated nitridation of niobium into superconducting Nb2N thin films for phase slip study
title_short	Substrate mediated nitridation of niobium into superconducting Nb2N thin films for phase slip study
title_full	Substrate mediated nitridation of niobium into superconducting Nb2N thin films for phase slip study
title_fullStr	Substrate mediated nitridation of niobium into superconducting Nb2N thin films for phase slip study
title_full_unstemmed	Substrate mediated nitridation of niobium into superconducting Nb2N thin films for phase slip study
title_sort	substrate mediated nitridation of niobium into superconducting nb2n thin films for phase slip study
publisher	Nature Portfolio
publishDate	2019
url	https://doaj.org/article/7606c44e12774c2e94c53987c1bf1cd1
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Substrate mediated nitridation of niobium into superconducting Nb2N thin films for phase slip study

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