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We report a detailed magnetic, dielectric and Raman studies on partiallydisordered and biphasic double perovskite La2NiMnO6. DC and AC magneticsusceptibility measurements show two magnetic anomalies at TC1 ~ 270 K and TC2~ 240 K, which may indicate the ferromagnetic ordering of the monoclinic andrhombohedral phases, respectively. A broad peak at a lower temperature (Tsg ~70 K) is also observed indicating a spin-glass transition due to partialanti-site disorder of Ni2+ and Mn4+ ions. Unlike the pure monoclinic phase, thebiphasic compound exhibits a broad but a clear dielectric anomaly around 270 Kwhich is a signature of magneto-dielectric effect. Temperature-dependent Ramanstudies between the temperature range 12 K to 300 K in a wide spectral rangefrom 220 cm-1 to 1530 cm-1 reveal a strong renormalization of the first as wellas second-order Raman modes associated with the (Ni/Mn)O6 octahedra near TC1implying a strong spin-phonon coupling. In addition, an anomaly is seen in thevicinity of spin-glass transition temperature in the temperature dependence ofthe frequency of the anti-symmetric stretching vibration of the octahedra.

Temperature dependent magnetic, dielectric and Raman studies of partially disordered La2NiMnO6