Anomalous dispersion of LO phonons in La{sub 1.85}Sr{sub 0.15}CuO{sub 4}

Journal Article · Mon Nov 01 00:00:00 EST 1999 · Journal of Low Temperature Physics

DOI:https://doi.org/10.1023/A:1022594322291· OSTI ID:20012829

Pintschovius, L; Braden, M

The dispersion of the highest energy LO phonon branch in La{sub 1.85}Sr{sub 0.15}CuO{sub 4} in the (100) direction has been reinvestigated by high resolution inelastic neutron scattering. In contrast to what has been recently reported by McQueeney et al., the authors find that the dispersion is continuous throughout the Brillouin zone. These results are in conflict with the idea of charge stripe order existing on a time scale which is long compared to that of the Lo frequencies. On the other hand, the strong softening and broadening of LO phonons observed on doping might be taken as a precursor phenomenon to a stripe order phase with a periodicity of about 4 lattice constants.

• Research Organization: Forschungszentrum Karlsruhe (DE)
• OSTI ID: 20012829
• Journal Information: Journal of Low Temperature Physics, Vol. 117, Issue 3-4; Conference: International Conference on Physics and Chemistry of Molecular and Oxide Superconductors, MOS'99, Stockholm (SE), 07/28/1999--08/02/1999; Other Information: PBD: Nov 1999; ISSN 0022-2291
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
PHONONS
LANTHANUM OXIDES
STRONTIUM OXIDES
COPPER OXIDES
BRILLOUIN ZONES
ORDER PARAMETERS
CRYSTAL LATTICES
HIGH-TC SUPERCONDUCTORS
CRYSTAL DOPING
SUPERCONDUCTIVITY