Anomalous spin dynamics and orbital excitations in Mott-insulating titanates
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Date
2010-02-03
Journal Title
Journal ISSN
Volume Title
Publisher
Australian Institute of Physics
Abstract
Spin and orbital degrees of freedom play an important role in the various phenomena of strongly correlated electron systems like unconventional high-temperature superconductivity in cuprates or colossal magnetoresistance in manganates. Our extensive neutron scattering experiments on the cubic perovskite titanates LaTiO3 and YTiO3 lead to the discovery of a highly unusual magnetic ground state which is in contradiction to the standard Goodenough-Kanamori rules, but indicates the presence of strong orbital fluctuations [1-4]. Raman light scattering spectra of LaTiO3 and YTiO3 exhibit unexpected features in the high
energy range well above the phonon spectrum [5]. Using momentum dependent resonant inelastic x-ray scattering (RIXS) experiments in combination with theoretical calculations, we were able to identify these excitations as collective orbital excitations (orbital waves termed ‘orbitons’) [6-7].
Description
Keywords
Spin, Dynamics, Excitation, Mott scattering, Titanates, Temperature range 0400-1000 K, Manganates, Scattering
Citation
Ulrich, C., Khaliullin, G., Ament, L. J. P., Ghiringhelli, G., Braicovich, L., Lorenz, T., Tokura, Y., van den Brink, J. & Keimer, B. (2010). Anomalous spin dynamics and orbital excitations in Mott-insulating titanates. Paper presented to the 34th Annual Condensed Matter and Materials Meeting 2010, Waiheke Island Resort, Waiheke, Auckland, New Zealand 2 - 5 February 2010. Retrieved from: https://physics.org.au/wp-content/uploads/cmm/2010/