Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2001-07-31
PRL 88, 075505 (2002)
Physics
Condensed Matter
Strongly Correlated Electrons
4 two-col pages, including 4 figures (2 in color); references added and updated Final version, accepted for publication in PRL
Scientific paper
10.1103/PhysRevLett.88.075505
We report a neutron scattering study of bond-stretching phonons in La(1.69)Sr(0.31)NiO(4), a doped antiferromagnet in which the added holes order in diagonal stripes at 45 deg to the Ni-O bonds. For the highest-energy longitudinal optical mode along the bonds, a softening of 20% is observed between the Brillouin zone center and zone boundary. At 45 deg to the bonds, a splitting of the same magnitude is found across much of the zone. Surprisingly, the charge-ordering wave vector plays no apparent role in the anomalous dispersions. The implications for related anomalies in the cuprates are discussed.
Braden Markus
McQueeney Robert J.
Nakajima Kaoru
Pintschovius L.
Tranquada John M.
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