Anomalous Noise in the Pseudogap Regime of YBa$_{2}$Cu$_{3}$O$_{7-\delta }$

ORAL

Abstract

The pseudogap regime of high temperature superconductors is usually associated with electronic correlations (e. g. charge stripes). In symmetry-broken correlated systems, slow switching between different configurations contributes to low-frequency noise. Transport noise measurements performed in underdoped YBCO and Ca-doped YBCO thin films reveals a well-defined temperature of order 250K below which an extra noise component sets in that exhibits sensitivity to magnetic fields, aging effects, and large discrete fluctuators. Such effects are characteristic of noise from collective states in disordered systems. The noise onset temperature varies with measurement frequency but is only weakly doping-dependent. To explain this behavior, we speculate on a model involving thermally-activated motion of charge stripes partially pinned to underlying magnetic order.

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Authors

  • Vladimir Orlyanchik

    University of Illinois at Urbana Champaign

  • David S. Caplan

  • Michael B. Weissman

    University of Illinois at Urbana Champaign

  • D.J. Van Harlingen

    University of Illinois at Urbana-Champaign, Department of Physics and Materials Research Laboratory, University of Illinois at Urbana-Champaign, University of Illinois at Urbana Champaign, University of Illinois

  • E. Fradkin

    University of Illinois at Urbana-Champaign, University of Illinois at Urbana Champaign, University of Illinois Urbana Champagin, Dept of Physics, University of Illinois, Dept. of Physics, University of Illinois, University of Illinois

  • Michael J. Hinton

    Ohio State University

  • Thomas Lemberger

    The Ohio State University, Department of physics, the Ohio State University, Ohio State University