Precision measurements of the temperature dependence of λ in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">YBa</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mn>6.95</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>: Strong evidence for nodes in the gap function
W. N. Hardy(University of British Columbia), D. A. Bonn(University of British Columbia), D. C. Morgan(University of British Columbia), Ruixing Liang(University of British Columbia), Kuan Zhang(University of British Columbia)
Cited by 1,101
Abstract
A miniature superconducting resonator operating at 1.3 K and 900 MHz has been used to measure the change in \ensuremath{\lambda}(T) from 1.3 K to ${\mathit{T}}_{\mathit{c}}$ in very high quality single crystals of ${\mathrm{YBa}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{6.95}$. The data, which have a resolution of 1-2 \AA{}, 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.
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