Oxygen Phonon Branches in Detwinned YBa2Cu3O7
D. Reznik, L. Pintschovius, W. Reichardt, Y. Endoh, H. Hiraka, J. M. Tranquada, S. Tajima, H. Uchiyama, T. Masui
Abstract
We report results of inelastic neutron scattering measurements of phonon dispersions on a detwinned sample of YBaCu3O7 and compare them with model calculations. Plane oxygen bond stretching phonon branches disperse steeply downwards from the zone center in both the a and the b direction indicating a strong electron-phonon coupling. Half way to the zone boundary, the phonon peaks become ill-defined but we see no need to invoke unit cell doubling or charge stripe formation: lattice dynamical shell model calculations predict such behavior as a result of branch anticrossings. There were no observable superconductivity-related temperature effects on selected plane oxygen bond stretching modes measured on a twinned sample.
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