Department of Physics and Meteorology, Indian Institute of Technology, Kharagpur, West Bengal 721302, India.
J Phys Condens Matter. 2012 Sep 19;24(37):376003. doi: 10.1088/0953-8984/24/37/376003. Epub 2012 Aug 23.
We report magnetization, dielectric and dc transport properties of La(2)NiMnO(6) nanoparticles. Both dc and ac magnetization measurements indicated a metastable magnetic behaviour with random ferromagnetic and antiferromagnetic interactions below 110 K; critical slow-down, memory and rejuvenation properties signify the spin glass nature. The dc resistivity shows a semiconducting nature but the temperature dependent magnetoresistance (MR) shows a peak at the spin glass transition. The colossal dielectric property and its frequency dependence were interpreted using the Maxwell-Wagner (MW) interfacial polarization model. Impedance analysis along with magnetodielectric (MD) and magnetoresistance (MR) indicates that the observed MD originates from the combined effect of MR and MW interfacial polarization.
我们报告了 La(2)NiMnO(6)纳米粒子的磁化、介电和直流输运性质。直流和交流磁化测量表明，在 110 K 以下存在随机铁磁和反铁磁相互作用的亚稳磁性；临界慢化、记忆和复兴特性表明存在自旋玻璃性质。直流电阻率表现出半导体性质，但温度相关磁电阻 (MR) 在自旋玻璃转变处出现峰值。巨介电性质及其频率依赖性使用 Maxwell-Wagner (MW) 界面极化模型进行了解释。阻抗分析以及磁电 (MD) 和磁电阻 (MR) 表明，观察到的 MD 来自于 MR 和 MW 界面极化的综合效应。
