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APS » Journals » Phys. Rev. B » Volume 58 » Issue 14
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Phys. Rev. B 58, R8933–R8936 (1998)

Magnetic penetration depth and surface resistance in ultrahigh-purity YBa2Cu3O7-δ crystals

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S. Kamal, Ruixing Liang, A. Hosseini, D. A. Bonn, and W. N. Hardy
Department of Physics, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1

Received 24 March 1998; revised 8 May 1998; published in the issue dated 1 October 1998

We have succeeded in growing very high-purity (99.995%) YBa2Cu3O7-δ crystals in BaZrO3 crucibles and have measured Δλ(T) and Rs(T) at 1 GHz in crystals with various oxygen treatments. For an oxygen vacancy level of δ=0.007, Δλ and Rs essentially reproduce our previous results and show no sign of the existence of the two order parameter components as recently reported by Srikanth et al. on BaZrO3-grown crystals. For other oxygen concentrations, we have in some cases observed deviations from the linear low T dependence of Δλ, but never any sign of a second transition.

© 1998 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.58.R8933
DOI:
10.1103/PhysRevB.58.R8933
PACS:
74.25.Nf, 74.62.Bf, 74.72.Bk, 74.40.+k
 
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