Phase Diagram and Upper Critical Field of Homogeneously Disordered Epitaxial 3-Dimensional NbN Films |
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Authors: | Mintu Mondal Madhavi Chand Anand Kamlapure John Jesudasan Vivas C Bagwe Sanjeev Kumar Garima Saraswat Vikram Tripathi Pratap Raychaudhuri |
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Affiliation: | 1. Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai, 400005, India 2. Department of Theoretical Physics, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai, 400005, India
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Abstract: | We report the evolution of superconducting properties with disorder, in 3-dimensional homogeneously disordered epitaxial NbN thin films. The effective disorder in NbN is controlled from moderately clean limit down to Anderson metal?Cinsulator transition by changing the deposition conditions. We propose a phase diagram for NbN in temperature-disorder plane. With increasing disorder, we observe that as k F l??1 the superconducting transition temperature (T c ) and normal state conductivity in the limit T??0 (?? 0) go to zero. The phase diagram shows that in homogeneously disordered 3-D NbN films, the metal?Cinsulator transition and the superconductor?Cinsulator transition occur at a single quantum critical point, k F l??1. |
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