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. HardyDepartment of Physics, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1D. A. BonnDepartment of Physics, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1D. C. MorganDepartment of Physics, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1Ruixing LiangDepartment of Physics, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1Kuan ZhangDepartment of Physics, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1
1993lv
ABI
Аннотация
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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