Please use this identifier to cite or link to this item:
|Title:||Temperature dependent magnetic, dielectric and Raman studies of partially disordered La2NiMnO6|
Muthu, D. V. S.
Sood, A. K.
|Keywords:||Condensed Matter Physics|
|Publisher:||Pergamon-Elsevier Science Ltd|
|Citation:||Kumar, P; Ghara, S; Rajeswaran, B; Muthu, DVS; Sundaresan, A; Sood, AK, Temperature dependent magnetic, dielectric and Raman studies of partially disordered La2NiMnO6. Solid State Communications 2014, 184, 47-51, http://dx.doi.org/10.1016/j.ssc.2014.01.002|
Solid State Communications
|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 T-C1 similar to 270 K and T-C2 similar to 240 K, which may indicate the ferromagnetic ordering of the monoclinic and rhombohedral phases, respectively. A broad peak at a lower temperature (T-sg similar to 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)O-6 octahedra near T-C1 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. (C) 2014 Elsevier Ltd. All rights reserved.|
|Appears in Collections:||Research Articles (Sundaresan A.)|
Files in This Item:
|855.79 kB||Adobe PDF||View/Open Request a copy|
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.