Using controlled disorder to probe the interplay between charge order and superconductivity in 2H-NbSe2

ORAL

Abstract

The interplay between superconductivity and charge density wave (CDW) in single crystals of 2H-NbSe2 was probed by tuning the amount of point - like disorder induced by 2.5 MeV electron irradiation. With increasing dose, Tc shows $non-trivial$ behavior, first increasing from 7.25 K to 7.45 K and then decreasing to 7.3 K, whereas TCDW monotonically decreases from 33 K and becomes unresolvable below 27 K. At this dose, Tc has a sharp drop by 0.3 K. The low temperature variation of the London penetration depth shows robust exponential behavior suggesting nodeless order parameter before and after irradiation, and overall trend is consistent with multiband superconductivity with two effective superconducting gaps. Our result supports the scenario of complex interplay of CDW and superconductivity, - competition for the density of states, but possible softening of the phon modes by long - range CDW.

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Presenters

  • Kyuil Cho

    Ames Laboratory and Department of Physics & Astronomy, Iowa State University, Ames Laboratory, Ames Laboratory and Iowa state University

Authors

  • Kyuil Cho

    Ames Laboratory and Department of Physics & Astronomy, Iowa State University, Ames Laboratory, Ames Laboratory and Iowa state University

  • Serafim Teknowijoyo

    Iowa State University and Ames Laboratory, Ames Laboratory and Iowa state University

  • Makariy Tanatar

    Iowa State University and Ames Laboratory, Ames Laboratory and Department of Physics & Astronomy, Iowa State University, Ames Laboratory, Ames Laboratory and Iowa state University, Iowa State University

  • Ruslan Prozorov

    Ames Lab, Iowa State University and Ames Laboratory, Ames Laboratory and Department of Physics & Astronomy, Iowa State University, Ames Laboratory, Ames Laboratory and Iowa state University, Ames Laboratory U.S. DOE and Department of Physics and Astronomy, Iowa State University

  • Marcin Konczykowski

    Ecole Polytechnique

  • Vivek Mishra

    Oak Ridge National Laboratory

  • Peter Hirschfeld

    Department of Physics, University of Florida, University of Florida, Univ of Florida - Gainesville, University of Florida - Gainesville, PHYSICS, UNIVERSITY OF FLORIDA