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

Kumar, Pradeep ; Ghara, Somnath ; Rajeswaran, B. ; Muthu, D.V.S. ; Sundaresan, A. ; Sood, A.K. (2014) Temperature dependent magnetic, dielectric and Raman studies of partially disordered La2NiMnO6 Solid State Communications, 184 . pp. 47-51. ISSN 0038-1098

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Official URL: http://doi.org/10.1016/j.ssc.2014.01.002

Related URL: http://dx.doi.org/10.1016/j.ssc.2014.01.002

Abstract

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

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
ID Code:120023
Deposited On:21 Jun 2021 14:13
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