Vortex dynamics investigated using low temperature scanning tunneling microscope: collective motion and collective pinning of vortices in NbSe$_{2}$

ORAL

Abstract

We report the observation of the collective motion and the collective pinning of vortices of NbSe$_{2}$ under various magnetic fields and from $\sim $6 K to $\sim $2 K using scanning tunneling microscopy (STM). Scanning Tunneling Spectroscopic maps were taken continuously, providing ``movies'' of the vortex motion. Based on the analysis of this data, the speed of the collective motion of vortices was $\sim $1 pm/s. The vortices showed clear signs of weak collective flux pinning. We will quantify the collective transport behavior of vortices based on our STM measurements and compare with the pertinent theories as well as related measurements done by other groups.

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Authors

  • Jonghee Lee

  • Hui Wang

  • Dan Sullivan

    • Lab for Physical Sciences, Dept. of Physics, University of Maryland
    • Department of Physics, University of Maryland, College Park, MD 20740

  • Michael Dreyer

    • Lab for Physical Sciences, Dept. of Electrical and Computer Engineering, University of Maryland
    • Department of Electrical \& Computer Engineering, University of Maryland, College Park, MD 20740
    • Lab for Physical Sciences, Dept. of Electrical And Computer Engineering, University of Maryland

  • Barry Barker

    • Lab for Physical Sciences, National Security Agency
    • Laboratory for Physical Sciences, National Security Agency, College Park, MD 20740

  • Pavel Shuk

  • Mark Higgins

  • Eva Y. Andrei

    • Department of Physics, Rutgers University, Piscataway, NJ 08854