Limits on Spin-Charge Separation from h/2e Fluxoids in Very Underdoped YBa2Cu3O6+x

J. C. Wynn, D. A. Bonn, B. W. Gardner, Yu-Ju Lin, Ruixing Liang, W. N. Hardy, J. R. Kirtley, and K. A. Moler
Phys. Rev. Lett. 87, 197002 – Published 16 October 2001
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Abstract

Magnetic flux in superconductors is usually quantized in units of h/2e. Here we report scanning SQUID and scanning Hall probe studies of single fluxoids in high purity YBa2Cu3O6.35 crystals ( Tc13K), extending flux quantization studies to a region of the cuprate phase diagram where the superfluid density is sufficiently low that novel behavior has been predicted. Some scenarios in which superconductivity results from spin-charge separation predict h/e fluxoids in materials with low superfluid density. Our observations of only h/2e fluxoids set limits on these theories.

  • Received 12 May 2001

DOI:https://doi.org/10.1103/PhysRevLett.87.197002

©2001 American Physical Society

Authors & Affiliations

J. C. Wynn1, D. A. Bonn2, B. W. Gardner1, Yu-Ju Lin1, Ruixing Liang2, W. N. Hardy2, J. R. Kirtley3, and K. A. Moler1,*

  • 1Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305
  • 2Department of Physics and Astronomy, University of British Columbia, Vancouver, BC Canada V6T 1Z1
  • 3IBM T. J. Watson Research Center, Yorktown Heights, New York 10598

  • *To whom correspondence should be addressed. Email address: kmoler@stanford.edu

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Vol. 87, Iss. 19 — 5 November 2001

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