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TT: Tiefe Temperaturen

TT 24: Postersitzung III: Korrelierte Elektronen, ”Orbital Physics”

TT 24.48: Poster

Mittwoch, 10. März 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).