Bond-Stretching-Phonon Anomalies in Stripe-Ordered La(1.69)Sr(0.31)NiO(4)

J. M. Tranquada; K. Nakajima; M. Braden; L. Pintschovius; R. J. McQueeney

doi:10.1103/PhysRevLett.88.075505

Bond-Stretching-Phonon Anomalies in Stripe-Ordered La(1.69)Sr(0.31)NiO(4)

Strongly Correlated Electrons 2009-11-07 v3

Authors: J. M. Tranquada , K. Nakajima , M. Braden , L. Pintschovius , R. J. McQueeney

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Abstract

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.

Keywords

neutron scattering bond-stretching phonons stripe order LaSrNiO phonon anomaly cuprates

Cite

@article{arxiv.cond-mat/0107635,
  title  = {Bond-Stretching-Phonon Anomalies in Stripe-Ordered La(1.69)Sr(0.31)NiO(4)},
  author = {J. M. Tranquada and K. Nakajima and M. Braden and L. Pintschovius and R. J. McQueeney},
  journal= {arXiv preprint arXiv:cond-mat/0107635},
  year   = {2009}
}

Comments

4 two-col pages, including 4 figures (2 in color); references added and updated Final version, accepted for publication in PRL

Bond-Stretching-Phonon Anomalies in Stripe-Ordered La(1.69)Sr(0.31)NiO(4)

Abstract

Keywords

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