Anomalous dispersion of LO phonons in La1.85Sr0.15CuO4 at low temperatures

Authors
McQueeney, RJ Petrov, Y Egami, T Yethiraj, M Shirane, G Endoh, Y
Citation
Rj. Mcqueeney et al., Anomalous dispersion of LO phonons in La1.85Sr0.15CuO4 at low temperatures, PHYS REV L, 82(3), 1999, pp. 628-631
Citations number
19
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
00319007 → ACNP
Volume
82
Issue
3
Year of publication
1999
Pages
628 - 631
Database
ISI
SICI code
0031-9007(19990118)82:3<628:ADOLPI>2.0.ZU;2-2
Abstract
Inelastic neutron scattering measurements of La1.85Sr0.15CuO4 show that a d iscontinuity in dispersion develops in the middle of the highest energy LO phonon branch at low temperatures. The result suggests dynamic short range unit cell doubling in the CuO2 plane along the direction of the Cu-O bond, such as charge ordering on every other row of oxygen. Such charge ordering is related to, but is different from, the stripe charge ordering observed f or nonsuperconducting cuprates. [S0031-9007(98)08166-6].