Effect of Phase Fluctuations on the Superconducting Properties of Strongly Disordered 3D NbN Thin Films (Contributo in atti di convegno)

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  • Effect of Phase Fluctuations on the Superconducting Properties of Strongly Disordered 3D NbN Thin Films (Contributo in atti di convegno) (literal)
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  • 2011-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1088/1742-6596/273/1/012071 (literal)
Alternative label
  • Madhavi Chand 1, Mintu Mondal 1, Anand Kamlapure 1, Garima Saraswat 1, Archana Mishra 2, John Jesudasan 1, Vivas C Bagwe 1, Sanjeev Kumar 1, Vikram Tripathi 3, Lara Benfatto 4 and Pratap Raychaudhuri 1 (2011)
    Effect of Phase Fluctuations on the Superconducting Properties of Strongly Disordered 3D NbN Thin Films
    in International Conference on Strongly Correlated Electron Systems (SCES 2010), Santa Fe, NM, un 27-Jul02, 2010
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Madhavi Chand 1, Mintu Mondal 1, Anand Kamlapure 1, Garima Saraswat 1, Archana Mishra 2, John Jesudasan 1, Vivas C Bagwe 1, Sanjeev Kumar 1, Vikram Tripathi 3, Lara Benfatto 4 and Pratap Raychaudhuri 1 (literal)
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  • art_n_012071 (literal)
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  • http://iopscience.iop.org/1742-6596/273/1/012071 (literal)
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  • 273 (literal)
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  • 1 (literal)
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  • 1) Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400005, India 2) IIC, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India 3) Department of Condensed Theoretical Physics, Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400005, India 4) INFM-CNR Statistical Mechanics and Complexity Center, University of Rome \"La Sapienza,\" P.le A. Moro 5, 00185 Rome, Italy (literal)
Titolo
  • Effect of Phase Fluctuations on the Superconducting Properties of Strongly Disordered 3D NbN Thin Films (literal)
Abstract
  • We present transport, Hall effect, electronic tunnelling and penetration depth studies in 3D homogeneously disordered epitaxial NbN thin films with disorder ranging from the moderately clean limit (KFl~10.12) to the very dirty limit (KFl~1.24). The superconducting transition temperature (Tc) decreases from ~17K to less than 350mK with increasing disorder. The Tc and conductivity at the lowest temperature (?0) both asymptotically approach zero as KFl ?l indicating a coincidence of the metal-insulator transition (MIT) and the superconductor-insulator transition (SIT). Close to critical disorder there is spatial inhomogeneity in the superconducting density of states (DOS) and the superconducting state is governed by quantum phase fluctuations. This results in suppression of the superfluid density (ns) and a pseudogap state where the resistance is no longer zero but the energy gap (?) remains finite. (literal)
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