Colossal Magneto-Dielectricity in La₂NiMnO₆ Probed by Raman Spectroscopy

Abstract:

In this work we demonstrate that La₂NiMnO₆ exhibits a colossal magneto-dielectric (MD) effect (5%-55%) over a broad range of temperatures (100–270 K), when compared to other Rare Earth (RE = Pr, Sm, and Tb) containing Ni-Mn double perovskites. The noticeable magneto-dielectric effect in RE₂NiMnO₆ signals the influence of spin orientations in the two magnetic sublattices on the spin-lattice coupling. Finally with the help of Raman spectroscopy we clarify that the presence of spin-phonon coupling alone is not the cause for the observed colossal MD effect in RE₂NiMnO₆.

• Periodical: Materials Science Forum (Volumes 830-831)
• Pages: 513-517
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.830-831.513
• Online since: September 2015
• Authors: P. Neenu Lekshmi*, Manoj Raama Varma
• Keywords: Double Perovskite, Magneto-Dielectric, Raman Spectroscopy

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