Spin-phonon coupling in ZnCr2Se4

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Spin-phonon coupling and magnetodielectric effects of ZnCr2Se4 were investigated by means of infrared (IR) spectroscopy as a function of temperature and magnetic field. ZnCr2Se4 is dominated by ferromagnetic exchange but undergoes antiferromagnetic order at T = 21 K. In the magnetically ordered phase the low-frequency IR active phonon splits, indicating strong dynamic anisotropy via magnetic exchange interactions. Antiferromagnetic order and concomitantly the phonon splitting is wiped out by external magnetic fields. Hence, ZnCr2Se4 is a prominent example of a spin-driven Jahn-Teller effect which can be fully suppressed in external magnetic fields.
5 pages, 4 figures

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Strongly Correlated Electrons

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http://salesiana.dossiersoluciones.com/handle/123456789/132976

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0611041
 http://arxiv.org/abs/cond-mat/0611041
 Phys. Rev. B 75, 052410 (2007)
 doi:10.1103/PhysRevB.75.052410

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arXiv