Elastic constants of a monocrystal of superconducting<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>7</mml:mn><mml:mi mathvariant="normal">−</mml:mi><mml:mi mathvariant="normal">δ</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>
Ming Lei(Los Alamos National Laboratory), J. L. Sarrao(Los Alamos National Laboratory), William M. Visscher(Los Alamos National Laboratory), Thomas Bell(Los Alamos National Laboratory), J. D. Thompson(Los Alamos National Laboratory), A. Migliori(Los Alamos National Laboratory), U. Welp(Los Alamos National Laboratory), B. W. Veal(Los Alamos National Laboratory)
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Abstract
All nine independent elastic constants ${\mathit{c}}_{\mathit{i}\mathit{j}}$ of a ${\mathrm{YBa}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{7\mathrm{\ensuremath{-}}\mathrm{\ensuremath{\delta}}}$ monocrystal were determined at room temperature using resonant ultrasound spectroscopy. Shear and Young moduli obtained from the ${\mathit{c}}_{\mathit{i}\mathit{j}}$ by the Voigt-Reuss-Hill averaging method agree well with the pulse-echo results on a polycrystal. The Debye temperature calculated from the elastic constants agrees with the specific-heat measurement.
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