Precision measurements of the temperature dependence of lamda in YBa Cu-2 O-36.95: Strong evidence for nodes in the gap function

Hardy, W.N.; Bonn, D.A.; Morgan, D.C.; Liang, Ruixing; Zhang, Kuan

doi:10.1103/PhysRevLett.70.3999

Precision measurements of the temperature dependence of lamda in YBa Cu-2 O-36.95: Strong evidence for nodes in the gap function

W.N. Hardy
(
- British Columbia U.
)
,
D.A. Bonn
(
- British Columbia U.
)
,
D.C. Morgan
(
- British Columbia U.
)
,
Ruixing Liang
(
- British Columbia U.
)
,
Kuan Zhang
(
- British Columbia U.
)

Jun 21, 1993

3 pages

Published in:

Phys.Rev.Lett. 70 (1993) 3999-4002

DOI:

10.1103/PhysRevLett.70.3999

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Abstract: (APS)

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.