Complete elastic constants and giant softening of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="italic">c</mml:mi></mml:mrow><mml:mrow><mml:mn>66</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>in superconducting<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">La</mml:mi></mml:mrow><mml:mrow><mml:mn>1.86</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">Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>0.14</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">CuO</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>
A. MiglioriLos Alamos National Laboratory, Los Alamos, New Mexico 87545William M. VisscherLos Alamos National Laboratory, Los Alamos, New Mexico 87545Sharon Wai-yee WongLos Alamos National Laboratory, Los Alamos, New Mexico 87545Sandra E. BrownLos Alamos National Laboratory, Los Alamos, New Mexico 87545Isao TanakaLos Alamos National Laboratory, Los Alamos, New Mexico 87545H. KojimaLos Alamos National Laboratory, Los Alamos, New Mexico 87545Philip B. AllenLos Alamos National Laboratory, Los Alamos, New Mexico 87545
1990lv
ABI
Abstract
A novel resonant ultrasound technique is used to measure all elastic constants and their temperature dependence in single-crystal ${\mathrm{La}}_{1.86}$${\mathrm{Sr}}_{0.14}$${\mathrm{CuO}}_{4}$. The in-plane shear modulus ${\mathit{c}}_{66}$ drops by nearly half upon cooling to 227 K, an effect attributed to order-parameter fluctuations (of 2D Gaussian character) near the tetragonal-orthorhombic phase boundary. Implications for current models of the structural phase transition are discussed, as well as the effect of domains in the low-temperature orthorhombic state.
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Cited by 20 references