NDLI: Magnetocaloric Effect and Critical Behavior in a Disordered Ferromagnet La0.7Sr0.3Mn0.9Ti0.1O3

Content Provider	IEEE Xplore Digital Library
Author	Ho, T.A. Duy-Truong Quach Thanh, T.D. Ho, T.O. Phan, M.H. Phan, T.L. Yu, S.C.
Copyright Year	1965
Abstract	The critical phenomena around the Curie temperature (T_C) of a polycrystalline La_0.7Sr_0.3Mn_0.9Ti_0.1O₃ were studied based on magnetic field and temperature dependence of magnetization. Using the modified Arrott plot method, we determined the critical parameters T_C≈234 K, β = 0.372 ± 0.012, γ = 1.171 ± 0.112, and δ = 4.15 ± 0.01. With these critical values, the M(H) data of the sample fall onto two universal branches of the scaling function M(H, ε) = \|ε\|^β f_±(H/\|ε\|^β+γ), where ε = (T - T_C)/T_C, and f₊ for T > T_C and f_- for T <; T_C. This pointed to the existence of a short-range ferromagnetic (FM) order in La_0.7Sr_0.3Mn_0.9Ti_0.1O₃, which is attributed to FM clusters persisting in a wide temperature range, even above T_C. Electron-spin-resonance spectra affirmed the presence of the FM clusters at temperatures as high as T = T_min (≈1.3 T_C), above which the sample is completely paramagnetic. Based on the M(H) data, we also calculated the magnetic-entropy change (ΔS_m), which reached a maximum (\|ΔS_max\| ≈ 4.3 J/kg · K) around the T_C, corresponding to the relative cooling power of ~200 J/kg for a field change ΔH = 50 kOe. A linear relationship \|ΔS_max(H)\| ∝ Hⁿ is achieved with a local exponent n = 0.59 determined from n = 1+ (β - 1)/(β + γ), indicative of a short-range FM system.
Sponsorship	IEEE Magnetics Society
Starting Page	1
Ending Page	4
Page Count	4
File Size	857340
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	Frequency modulation Magnetic separation Magnetic resonance Temperature measurement Magnetization Ions Magnetic field measurement Electron Spin Resonance Ti-doped La0.7Sr0.3MnO3 Critical behavior Magnetocaloric effect electron-spin resonance (ESR) magnetocaloric effect (MCE)
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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