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}

Journal Article · Wed Sep 01 00:00:00 EDT 1999 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.59621· OSTI ID:20216664

Egami, T ^[1]; McQueeney, R J ^[2]; Petrov, Y ^[3]; Yethiraj, M ^[4]; Shirane, G ^[5]; Endoh, Y ^[6]

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1. Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104 (United States)
2. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
3. Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104 (United States)
4. Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)
5. Brookhaven National Laboratory, Upton, New York 11973 (United States)
6. Department of Physics, Tohoku University, Sendai 980, (Japan)

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. (c) 1999 American Institute of Physics.

• OSTI ID: 20216664
• Journal Information: AIP Conference Proceedings, Vol. 483, Issue 1; Other Information: PBD: 1 Sep 1999; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
HIGH-TC SUPERCONDUCTORS
LANTHANUM OXIDES
STRONTIUM OXIDES
YTTRIUM OXIDES
COPPER OXIDES
NEUTRON DIFFRACTION
ELECTRON-PHONON COUPLING
DISPERSION RELATIONS
PAIRING INTERACTIONS
EXPERIMENTAL DATA