Time resolved Raman scattering on the pair-breaking peak in Bi-2212 -- direct observation of the dynamics of the superconducting order parameter

ORAL

Abstract

We employ a novel time resolved two-color pump probe Raman technique to study the electronic dynamics in the superconducting state of the high temperature superconductor Bi-2212. By studying the temporal evolution of the gap and the pair-breaking peak in the superconducting state, we reveal two contributions to the superconducting order parameter that respond within 1 ps and 7 ps, respectively. Both effects conserve spectral weight in the sense that the suppression of the pair-breaking peak appears concomitantly with the build up of in-gap states. The recovery times for both contributions to the gap are different by a factor of 4 outlining fundamentally different coupling mechanisms.

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Authors

  • Pelangi Saichu

    University of Hamburg

  • Ilka Mahns

    University of Hamburg, IAP, University of Hamburg, Germany

  • Arne Goos

    University of Hamburg

  • Stephan Binder

    University of Hamburg

  • Stefan Singer

    University of Hamburg

  • J. Unterhinninghofen

    Max-Planck Institut fuer Festkoerperforschung

  • B. Schulz

    Institute of Applied Physics, University of Hamburg, D-20355 Hamburg, Germany, University of Hamburg, IAP, University of Hamburg, Germany

  • A. Rusydi

    University of Hamburg, IAP, University of Hamburg, Germany

  • S.L. Cooper

    University of Illinois at Urbana-Champaign, Dept. of Physics and Frederick Seitz Materials Research Laboratory, Univ. of Ill., Urbana-Champaign, Dept. of Physics and Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Illinois

  • Miles Klein

    University of Illinois at Urbana-Champaign

  • P. Guptasarma

    University of Wisconsin-Milwaukee

  • Dirk Manske

    Max-Planck Institut fuer Festkoerperforschung

  • M. Ruebhausen

    University of Hamburg, IAP, University of Hamburg, Germany