Phys. Rev. Lett. 70, 3999–4002 (1993)Precision measurements of the temperature dependence of λ in YBa2Cu3O6.95: Strong evidence for nodes in the gap functionReceived 18 January 1993; published in the issue dated 21 June 1993 A miniature superconducting resonator operating at 1.3 K and 900 MHz has been used to measure the change in λ(T) from 1.3 K to Tc in very high quality single crystals of YBa2Cu3O6.95. The data, which have a resolution of 1-2 Å, show a strong linear term extending from approximately 3 to 25 K. We believe the strong linear dependence to be characteristic of the pure system and that its apparent absence in thin films and some crystals is due to the presence of defects. © 1993 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.70.3999
DOI:
10.1103/PhysRevLett.70.3999
PACS:
74.72.Bk, 74.25.Nf
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