Spin-phonon coupling in Y2NiMnO6 double perovskite probed by Raman spectroscopy

Macedo Filho, Raimundo Bezerra; Pedro Ayala, Alejandro; William de Araujo Paschoal, Carlos
May 2013
Applied Physics Letters;5/13/2013, Vol. 102 Issue 19, p192902
Academic Journal
Temperature-dependent Raman spectroscopy measurements in Y2NiMnO6 ceramics were performed in the 20 K-850 K range. A detailed analysis of the temperature dependence of the phonon energy of the oxygen octahedra stretching mode shows an anomalous softening below the Curie temperature. This effect was ascribed to a spin-phonon coupling, suggesting that the oxygen octahedra stretching vibrational mode stabilizes the magnetic interaction. The observed spin-phonon coupling is stronger than those reported in other Re2NiMnO6 double perovskites, suggesting that the rare earth ionic radius is not the unique parameter influencing the magnitude of this effect.


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