Electronic Structure, Phonons and Dielectric Anomaly in Ferromagnetic Insulating Double Perovskite La2NiMnO6

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Using first-principles density functional calculations, we study the electronic and magnetic properties of ferromagnetic insulating double-perovskite compound La2NiMnO6, which has been reported to exhibit interesting magnetic field sensitive dielectric anomaly as a function of temperature. Our study reveals existence of very soft infra-red active phonons that couple strongly with spins at the Ni and Mn sites through modification of the super-exchange interaction. We suggest that these modes are the origin for observed dielectric anomaly in La2NiMnO6.
4 pages,3 figures

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Materials Science

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http://salesiana.dossiersoluciones.com/handle/123456789/160561

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/0805.1112
 http://arxiv.org/abs/0805.1112
 PRL 100,186402 (2008)
 doi:10.1103/PhysRevLett.100.186402

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arXiv