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We report a neutron scattering study of bond-stretching phonons inLa(1.69)Sr(0.31)NiO(4), a doped antiferromagnet in which the added holes orderin diagonal stripes at 45 deg to the Ni-O bonds. For the highest-energylongitudinal optical mode along the bonds, a softening of 20% is observedbetween the Brillouin zone center and zone boundary. At 45 deg to the bonds, asplitting of the same magnitude is found across much of the zone. Surprisingly,the charge-ordering wave vector plays no apparent role in the anomalousdispersions. The implications for related anomalies in the cuprates arediscussed.Comment: 4 two-col pages, including 4 figures (2 in color); references added  and updated Final version, accepted for publication in PR

physical review letters

Bond-Stretching-Phonon Anomalies in Stripe-Ordered<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>La</mml:mi></mml:mrow><mml:mrow><mml:mn>1.69</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>0.31</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>NiO</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow></mml…

Bond-Stretching-Phonon Anomalies in Stripe-OrderedLa1.69Sr0.31NiO4