Inelastic neutron scattering measurements of La{sub 1.85}Sr{sub 0.15}CuO{sub 4} and YBa{sub 2}Cu{sub 3}O{sub 7} show that the dispersion of the high energy LO phonon mode along the (1,0,0) direction is strongly temperature dependent, and at low temperatures develops an anomalous feature indicative of dynamic cell-doubling. The anomaly does not change through superconducting transition and gradually disappears between 50 and 250 K in LSCO. Possible implications are discussed.
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Los Alamos National Lab., TN (United States)
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New Mexico
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Inelastic neutron scattering measurements of La{sub 1.85}Sr{sub 0.15}CuO{sub 4} and YBa{sub 2}Cu{sub 3}O{sub 7} show that the dispersion of the high energy LO phonon mode along the (1,0,0) direction is strongly temperature dependent, and at low temperatures develops an anomalous feature indicative of dynamic cell-doubling. The anomaly does not change through superconducting transition and gradually disappears between 50 and 250 K in LSCO. Possible implications are discussed.
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Egami, T.; Petrov, Y.; McQueeney, R. J.; Yethiraj, M.; Shirane, G. & Endoh, Y.Low temperature anomaly of LO phonons in La{sub 1.85}Sr{sub 0.15}CuO{sub 4} and YBa{sub 2}Cu{sub 3}O{sub 7},
report,
April 1999;
New Mexico.
(https://digital.library.unt.edu/ark:/67531/metadc676047/:
accessed April 19, 2024),
University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu;
crediting UNT Libraries Government Documents Department.