Magnetic Order and Dynamics in an Orbitally Degenerate Ferromagnetic Insulator

Details Magnetic Order and Dynamics in an Orbitally Degenerate Ferromagnetic Insulator Magnetic Order and Dynamics in an Orbitally Degenerate Ferromagnetic Insulator

2002-09-17

arxiv.org/abs/cond-mat/0209400v1

Phys. Rev. Lett. 89, 167202 (2002)

Physics

Condensed Matter

Strongly Correlated Electrons

to appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.89.167202

Neutron scattering was used to determine the spin structure and the magnon spectrum of the Mott--Hubbard insulator YTiO$_3$. 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 YTiO$_3$ and discuss general implications for a theoretical description of exchange interactions in orbitally degenerate systems.

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