Lower Critical Field and Superfluid Density of Highly Underdoped YBa2Cu3O6+x Single Crystals

Ruixing Liang, D. A. Bonn, W. N. Hardy, and David Broun
Phys. Rev. Lett. 94, 117001 – Published 22 March 2005

Abstract

The lower critical field Hc1 for highly underdoped YBa2Cu3O6+x with Tc between 8.9 and 22 K has been determined by measurements of magnetization M(H) curves with applied field parallel to the c axis. Hc1 is linear in temperatures below about 0.6Tc, and Hc1(0) is proportional to Tc1.64±0.04, clearly violating the proportionality between ρs(0) and Tc. Moreover, the slope dHc1/dT decreases steeply toward zero as Tc approaches zero, indicating that the effective charge of the quasiparticles vanishes as the doping is decreased toward the insulating phase.

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  • Received 1 September 2004

DOI:https://doi.org/10.1103/PhysRevLett.94.117001

©2005 American Physical Society

Authors & Affiliations

Ruixing Liang1, D. A. Bonn1, W. N. Hardy1, and David Broun2

  • 1Department of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, British Columbia, Canada V6T 1Z1
  • 2Department of Physics, Simon Fraser University, Burnaby, British Columbia, Canada V5A 1S6

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Issue

Vol. 94, Iss. 11 — 25 March 2005

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