Phys. Rev. Lett. 73, 2484–2487 (1994)Measurement of the ab Plane Anisotropy of Microwave Surface Impedance of Untwinned YBa2Cu3O6.95 Single CrystalsReceived 4 April 1994; published in the issue dated 31 October 1994 The temperature dependence of the surface resistance Rs, and the penetration depth λ has been measured in both a and b directions in Yba2Cu3O6.95. The overall temperature dependences are similar and show a linear behavior at low T. This argues against the chains playing a direct role in the unconventional behavior of the surface impedance. The residual Rs of these twin-free crystals is very small, implying a residual conductivity of the order of the minimum value predicted by Lee Phys. Rev. Lett. 71 1837 (1993) for a d-wave superconductor. © 1994 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.73.2484
DOI:
10.1103/PhysRevLett.73.2484
PACS:
74.25.Fy, 74.25.Nf, 74.72.Bk
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