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}

Technical Report · Thu Apr 01 00:00:00 EST 1999

DOI:https://doi.org/10.2172/334198· OSTI ID:334198

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

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1. Univ. of Pennsylvania, Philadelphia, PA (United States)
2. Los Alamos National Lab., NM (United States)
3. Oak Ridge National Lab., TN (United States)
4. Brookhaven National Lab., Upton, NY (United States)
5. Tohoku Univ., Sendai (Japan). Dept. of Physics

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.

• Research Organization: Los Alamos National Lab., TN (United States)
• Sponsoring Organization: USDOE Office of Energy Research, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 334198
• Report Number(s): LA-UR-99-646; CONF-990116-; ON: DE99002184; TRN: 99:004972
• Resource Relation: Conference: High temperature superconductivity conference, Miami, FL (United States), 7-13 Jan 1999; Other Information: PBD: [1999]
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ELECTRONIC STRUCTURE
SUPERCONDUCTIVITY
LANTHANUM OXIDES
STRONTIUM OXIDES
COPPER OXIDES
YTTRIUM OXIDES
BARIUM OXIDES
INELASTIC SCATTERING
NEUTRONS
PHONONS
EXPERIMENTAL DATA