Regensburg 2004 – scientific programme
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TT: Tiefe Temperaturen
TT 24: Postersitzung III: Korrelierte Elektronen, ”Orbital Physics”
TT 24.48: Poster
Wednesday, March 10, 2004, 14:30–19:00, Poster A
Search for orbital excitations in YTiO3: calculation of phonon dispersion relations — •M. Guennou1, C. Ulrich1, C. Frost2, S. Miyasaka3, Y. Taguchi3, Y. Tokura3, and B. Keimer1 — 1Max-Planck-Institut FKF, Stuttgart — 2ISIS, Oxford, England — 3Departement of Applied Physics, University of Tokyo, Japan
The purpose of our study was to search for elementary excitations of the orbital magnetization, the so-called orbitons, in YTiO3. We have performed single crystal inelastic neutron scattering experiments up to high energies (350 meV) at the spectrometer MAPS at the ISIS facility in Oxford. In order to give an interpretation of the features observed at high energies, we have calculated the phonon dispersion relations and the first and higher order density of states. There is a good agreement between the calculated phonon dispersion relations and the first order phonon modes measured by neutron and Raman scattering. These results will be compared with the theoretical predictions for the orbital dispersion relations given by G. Khaliullin [1].
[1] G. Khaliullin et al., Phys.Rev.Lett. 89, 167201 (2002).