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Critical Behavior in Double-Exchange Ferromagnets of Pr0.6Sr0.4MnO3 Nanoparticles

机译:Pr 0.6 Sr 0.4 MnO 3 纳米粒子在双交换铁磁体中的临界行为

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In this paper, we present a detailed study on the critical property around the ferromagnetic (FM)–paramagnetic phase transition of PrSrMnO nanoparticles (NPs) with different crystallite sizes (–88 nm), which were synthesized by the combination of the solid-state reaction and mechanical milling methods. The magnetic results show that the samples undergo the second-order phase transition. The values of the Curie temperature () slightly decrease from 291 to 286 K while the saturation magnetization () decreases from 89.7 to 76.3 emu/g and the coercivity () increases from 322 to 585 Oe with decreasing from 88 to 39 nm, respectively. Based on the modified Arrott plot method and the isothermal magnetization data around , we have determined the values of critical exponents (, and ) and for the samples. The critical exponents – 0.495, – 1.042, and – 3.118 obtained are close to those expected for the mean field theory ( , and ). This proves that long-range FM interactions are present in the NPs. Furthermore, values are smaller than 0.5, indicating the existence of magnetic inhomogeneity in the NPs. Besides the investigation into the critical behavior, the magnetocaloric effect of the NPs is also investigated.
机译:在本文中,我们对通过固态结合合成的具有不同微晶尺寸(–88 nm)的PrSrMnO纳米颗粒(NPs)的铁磁(FM)-顺磁相变的临界性质进行了详细研究。反应和机械研磨方法。磁性结果表明样品经历了二阶相变。居里温度()的值从291 K略微降低到286 K,而饱和磁化强度()从89.7降低到76.3 emu / g,矫顽力()从322增加到585 Oe,从88降低到39 nm。基于改进的Arrott绘图方法和周围的等温磁化数据,我们确定了临界指数(和)和样品的值。所获得的临界指数– 0.495,– 1.042和– 3.118与平均场理论(和)的预期接近。这证明了在NP中存在长距离FM相互作用。此外,该值小于0.5,表明NP中存在磁不均匀性。除了研究临界行为外,还研究了纳米粒子的磁热效应。

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