Phys. Rev. Lett. 100, 227002 (2008) [4 pages]Bond Stretching Phonon Softening and Kinks in the Angle-Resolved Photoemission Spectra of Optimally Doped Bi2Sr1.6La0.4Cu2O6+δ SuperconductorsReceived 28 September 2007; published 4 June 2008 We report the first measurement of the Cu-O bond stretching phonon dispersion in optimally doped Bi2Sr1.6La0.4Cu2O6+δ using inelastic x-ray scattering. We found a softening of this phonon at q=(≈0.25,0,0) from 76 to 60 meV, similar to the one reported in other cuprates. A comparison with angle-resolved photoemission data on the same sample revealed an excellent agreement in terms of energy and momentum between the angle-resolved photoemission nodal kink and the soft part of the bond stretching phonon. Indeed, we find that the momentum space where a 63±5 meV kink is observed can be connected with a vector q=(ξ,0,0) with ξ≥0.22, corresponding exactly to the soft part of the bond stretching phonon. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.227002
DOI:
10.1103/PhysRevLett.100.227002
PACS:
74.72.Hs, 74.25.Jb, 74.25.Kc
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