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Journal Article

Magnetic Order and Dynamics in an Orbitally Degenerate Ferromagnetic Insulator

MPS-Authors
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Ulrich,  C.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;
Scientific Facility Thin Film Technology (Gennady Logvenov), Max Planck Institute for Solid State Research, Max Planck Society;

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Khaliullin,  G.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Reehuis,  M.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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He,  H.
Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society;
Scientific Facility Crystal Growth (Masahiko Isobe), Max Planck Institute for Solid State Research, Max Planck Society;

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Keimer,  B.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Ulrich, C., Khaliullin, G., Okamoto, S., Reehuis, M., Ivanov, A., He, H., et al. (2002). Magnetic Order and Dynamics in an Orbitally Degenerate Ferromagnetic Insulator. Physical Review Letters, 89(16): 167202.


Cite as: https://hdl.handle.net/21.11116/0000-000E-EF1B-8
Abstract
Neutron scattering was used to determine the spin structure and
the magnon spectrum of the Mott-Hubbard insulator YTiO3. The
magnetic structure is complex, comprising substantial G-type
and A-type antiferromagnetic components in addition to the
predominant ferromagnetic component. The magnon spectrum, on
the other hand, is gapless and nearly isotropic. We show that
these findings are inconsistent with the orbitally ordered
states thus far proposed for YTiO3 and discuss general
implications for a theoretical description of exchange
interactions in orbitally degenerate systems.