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Phys. Rev. Lett. 87, 197002 (2001) [4 pages]

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

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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

Received 12 May 2001; published 16 October 2001

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 ( Tc≲13K), 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.

© 2001 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.87.197002
DOI:
10.1103/PhysRevLett.87.197002
PACS:
74.25.Ha, 74.60.-w, 74.72.Bk

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

 
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