2008/04/08 by J. Graf, M. d'Astuto, M. d’Astuto +14 · 3 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Magnetic and transport properties of perovskites and related materials #Physics of Superconductivity and Magnetism #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevlett.100.227002
published as Phys. Rev. Lett. 100, 227002 (2008) · submited to PRL
arxiv created 2008/04/08 · openalex publication_date 2008/06/04 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We report the first measurement of the Cu-O bond stretching phonon dispersion in optimally doped Bi2Sr1.6La0.4Cu2O_6+\ensuremathδ using inelastic x-ray scattering. We found a softening of this phonon at q=(\ensuremath≈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\ifmmode±\else\textpm\fi5 meV kink is observed can be connected with a vector q=(\ensuremathξ,0,0) with \ensuremathξ\ensuremath≥0.22, corresponding exactly to the soft part of the bond stretching phonon.