Advertisement

Robust pseudogap across the magnetic field driven superconductor to insulator-like transition in strongly disordered NbN films

  • Indranil RoyEmail author
  • Rini Ganguly
  • Harkirat Singh
  • Pratap Raychaudhuri
Regular Article
  • 64 Downloads

Abstract

We investigate the magnetic field evolution of the superconducting state in a strongly disordered NbN thin film which exhibits a magnetic field tuned superconductor to insulator-like transition, employing low temperature scanning tunneling spectroscopy (STS). Transport measurements of the sample reveals a characteristic magnetic field, which separates the low field state where resistance decreases with decreasing temperature, i.e. dR/dT > 0 and a high-field state where dR/dT < 0. However, STS imaging of the superconducting state reveals a smooth evolution across this field and the presence of a robust pseudogap on both sides of this characteristic field. Our results suggest that the superconductor-insulator transition might be a percolative transition driven by the shrinking of superconducting fraction with magnetic field.

Graphical abstract

Keywords

Solid State and Materials 

Supplementary material

References

  1. 1.
    A. Ghosal, M. Randeria, N. Trivedi, Phys. Rev. Lett. 81, 3940 (1998) ADSCrossRefGoogle Scholar
  2. 2.
    Y. Dubi, Y. Meir, Y. Avishai, Nature 449, 876 (2007) ADSCrossRefGoogle Scholar
  3. 3.
    M.V. Feigel’man, L.B. Ioffe, V. E. Kravtsov, E.A. Yuzbashyan, Phys. Rev. Lett. 98, 027001 (2007) ADSCrossRefGoogle Scholar
  4. 4.
    B. Sacépé, C. Chapelier, T.I. Baturina, V.M. Vinokur, M.R. Baklanov, M. Sanquer, Phys. Rev. Lett. 101, 157006 (2008) ADSCrossRefGoogle Scholar
  5. 5.
    M. Mondal, A. Kamlapure, M. Chand, G. Saraswat, S. Kumar, J. Jesudasan, L. Benfatto, V. Tripathi, P. Raychaudhuri, Phys. Rev. Lett. 106, 047001 (2011) ADSCrossRefGoogle Scholar
  6. 6.
    M. Tinkham, Introduction to Superconductivity, 2nd edn. (Dover Publications Inc., Mineola, New York, 2004) Google Scholar
  7. 7.
    B. Sacépé, C. Chapelier, T.I. Baturina, V.M. Vinokur, M.R. Baklanov, M. Sanquer, Nat. Commun. 1, 140 (2010) CrossRefGoogle Scholar
  8. 8.
    B. Sacépé, T. Dubouchet, C. Chapelier, M. Sanquer, M. Ovadia, D. Shahar, M. Feigel’man, L. Ioffe, Nat. Phys. 7, 239 (2011) CrossRefGoogle Scholar
  9. 9.
    D. Sherman, G. Kopnov, D. Shahar, A. Frydman, Phys. Rev. Lett. 108, 177006 (2012) ADSCrossRefGoogle Scholar
  10. 10.
    T.I. Baturina, A.Yu. Mironov, V.M. Vinokur, M.R. Baklanov, C. Strunk, Phys. Rev. Lett. 99, 257003 (2007) ADSCrossRefGoogle Scholar
  11. 11.
    G. Sambandamurthy, L.W. Engel, A. Johansson, D. Shahar, Phys. Rev. Lett. 92, 107005 (2004) ADSCrossRefGoogle Scholar
  12. 12.
    M.D. Stewart Jr., A. Yin, J.M. Xu, J.M. Valles Jr., Phys. Rev. B 77, 140501(R) (2008) ADSCrossRefGoogle Scholar
  13. 13.
    M. Chand, G. Saraswat, A. Kamlapure, M. Mondal, S. Kumar, J. Jesudasan, V. Bagwe, L. Benfatto, V. Tripathi, P. Raychaudhuri, Phys. Rev. B 85, 014508 (2012) ADSCrossRefGoogle Scholar
  14. 14.
    W. Liu, L.D. Pan, J. Wen, M. Kim, G. Sambandamurthy, N.P. Armitage, Phys. Rev. Lett. 111, 067003 (2013) ADSCrossRefGoogle Scholar
  15. 15.
    S.L. Sondhi, S.M. Girvin, J.P. Carini, D. Shahar, Rev. Mod. Phys. 69, 315 (1997) ADSCrossRefGoogle Scholar
  16. 16.
    A. Gangopadhyay, V. Galitski, M. Müller, Phys. Rev. Lett. 111, 026801 (2013) ADSCrossRefGoogle Scholar
  17. 17.
    M.P.A. Fisher, Phys. Rev. Lett. 65, 923 (1990) ADSCrossRefGoogle Scholar
  18. 18.
    M.C. Cha, M.P.A. Fisher, S.M. Girvin, M. Wallin, A.P. Young, Phys. Rev. B 44, 6883 (1991) ADSCrossRefGoogle Scholar
  19. 19.
    E.S. Sorensen, M. Wallin, S.M. Girvin, A.P. Young, Phys. Rev. Lett. 69, 828 (1992) ADSCrossRefGoogle Scholar
  20. 20.
    M. Wallin, E.S. Sorensen, S.M. Girvin, A.P. Young, Phys. Rev. B 49, 12115 (1994) ADSCrossRefGoogle Scholar
  21. 21.
    V.M. Vinokur, T.I. Baturina, M.V. Fistul, A.Yu. Mironov, M.R. Baklanov, C. Strunk, Nature 452, 613 (2008) ADSCrossRefGoogle Scholar
  22. 22.
    M. Ovadia, D. Kalok, B. Sacépé, D. Shahar, Nat. Phys. 9, 415 (2013) CrossRefGoogle Scholar
  23. 23.
    Y. Dubi, Y. Meir, Y. Avishai, Phys. Rev. B 73, 054509 (2006) ADSCrossRefGoogle Scholar
  24. 24.
    A. Kamlapure, T. Das, S.C. Ganguli, J.B. Parmar, S. Bhattacharyya, P. Raychaudhuri, Sci. Rep. 3, 2979 (2013) ADSCrossRefGoogle Scholar
  25. 25.
    R. Ganguly, I. Roy, A. Banerjee, H. Singh, A. Ghosal, P. Raychaudhuri, Phys. Rev. B 96, 054509 (2017) ADSCrossRefGoogle Scholar
  26. 26.
    Madhavi Chand, Ph.D. thesis, Tata Institute of Fundamental Research, 2012, available at https://doi.org/www.tifr.res.in/~superconductivity/pdfs/madhavi.pdf
  27. 27.
    M. Chand, A. Mishra, Y.M. Xiong, A. Kamlapure, S.P. Chockalingam, J. Jesudasan, V. Bagwe, M. Mondal, P.W. Adams, V. Tripathi, P. Raychaudhuri, Phys. Rev. B 80, 134514 (2009) ADSCrossRefGoogle Scholar
  28. 28.
    P. Haldar, M.S. Laad, S.R. Hassan, M. Chand, P. Raychaudhuri, Phys Rev. B 96, 155113 (2017) ADSCrossRefGoogle Scholar
  29. 29.
    A. Kamlapure, G. Saraswat, S.C. Ganguli, V. Bagwe, P. Raychaudhuri, S.P. Pai, Rev. Sci. Instr. 84, 123905 (2013) ADSCrossRefGoogle Scholar
  30. 30.
    T.I. Baturina, D.R. Islamov, J. Bentner, C. Strunk, M.R. Baklanov, A. Satta, JETP Lett. 79, 337 (2004) ADSCrossRefGoogle Scholar
  31. 31.
    V.F. Gantmakher, M.V. Golubkov, V.T. Dolgopolov, A.A. Shashkin, G.E. Tsydynzhapov, JETP Lett. 71, 473 (2000) ADSCrossRefGoogle Scholar
  32. 32.
    A.F. Hebard, M.A. Paalanen, Phys. Rev. Lett. 65, 927 (1990) ADSCrossRefGoogle Scholar
  33. 33.
    F.Y. Wu, Rev. Mod. Phys. 54, 235 (1982), Section IV. C.2 ADSCrossRefGoogle Scholar
  34. 34.
    X. Shi, P.V. Lin, T. Sasagawa, V. Dobrosavljević, D. Popović, Nat. Phys. 10, 437 (2014) CrossRefGoogle Scholar

Copyright information

© EDP Sciences / Società Italiana di Fisica / Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Tata Institute of Fundamental ResearchColaba, MumbaiIndia
  2. 2.Department of PhysicsNational Institute of TechnologyHazratbal, SrinagarIndia

Personalised recommendations