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

Content Provider	IEEE Xplore Digital Library
Author	Tran Dang Thanh Yu YiKyung Ho, T.A. Manh, T.V. Tartakovsky, D.M. Seong Cho Yu
Copyright Year	1965
Abstract	In this paper, we present a detailed study on the critical property around the ferromagnetic (FM)-paramagnetic phase transition of Pr_0.6Sr_0.4MnO₃ nanoparticles (NPs) with different crystallite sizes (d = 39-88 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 (T_C) slightly decrease from 291 to 286 K while the saturation magnetization (MS) decreases from 89.7 to 76.3 emu/g and the coercivity (H_C) increases from 322 to 585 Oe with decreasing d from 88 to 39 nm, respectively. Based on the modified Arrott plot method and the isothermal magnetization data around T_C, we have determined the values of critical exponents (β, y, and S) and T_C for the samples. The critical exponents β = 0.486 - 0.495, y = 1.009 - 1.042, and S = 3.038 - 3.118 obtained are close to those expected for the mean field theory (β = 0.5, y = 1, and S = 3). This proves that long-range FM interactions are present in the NPs. Furthermore, β 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.
Sponsorship	IEEE Magnetics Society
Starting Page	1
Ending Page	4
Page Count	4
File Size	2278784
File Format	PDF
ISSN	00189464
Volume Number	51
Issue Number	11
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Saturation magnetization Magnetization Magnetic hysteresis Frequency modulation Temperature measurement Magnetic properties Magnetic fields Ferromagnetic interactions Manganite nanoparticles Critical behavior manganite nanoparticles (NPs) ferromagnetic (FM) interactions
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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