Magnetic-order induced phonon splitting in MnO from far-infrared spectroscopy

Details Magnetic-order induced phonon splitting in MnO from far-infrared spectroscopy Magnetic-order induced phonon splitting in MnO from far-infrared spectroscopy

2007-07-05

arxiv.org/abs/0707.0820v2

Phys. Rev. B 77, 024421 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 figures

Scientific paper

10.1103/PhysRevB.77.024421

Detailed far-infrared spectra of the optical phonons are reported for antiferromagnetic MnO. Eigenfrequencies, phonon damping and effective plasma frequencies are studied as a function of temperature. Special attention is paid to the phonon splitting at the antiferromagnetic phase transition. The results are compared to recent experimental and theoretical studies of the spin-phonon coupling in frustrated magnets, which are explained in terms of a spin-driven Jahn-Teller effect, and to ab initio and model calculations, which predict phonon splitting induced by magnetic order.

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