NDLI: Inhomogeneous Ferromagnetism and Spin-Glass-Like Behavior in <inline-formula> <tex-math notation=TeX>$({rm Nd}_{1-x}{rm Y}_{x})_{0.7}{rm Sr}_{0.3}{rm MnO}_{3}$ </tex-math></inline-formula> With <inline-formula> <tex-math notation=TeX>$x=0.21{-}0.35$ </tex-math></inline-formula>

Content Provider	IEEE Xplore Digital Library
Author	Phan, T.L. Nguyen, V.D. Ho, T.A. Khiem, N.V. Thanh, T.D. Phuc, N.X. Thang, P.D. Yu, S.C.
Copyright Year	1965
Abstract	The magnetic properties of polycrystalline ceramic samples (Nd_1-xY_x)_0.7Sr_0.3MnO₃ with x = 0.21 - 0.35 were studied by means of dc magnetization and ac susceptibility measurements. Experimental results reveal a strong decrease of the ferromagnetic (FM)-paramagnetic phase-transition temperature (T_C) from 97 to 65 K as increasing x from 0.21 to 0.35, respectively. There is magnetic inhomogeneity associated with short-range FM order. Particularly, the samples undergo a spin-glass (SG) phase transition at the so-called blocking temperature (T_B) below T_C, which shifts toward lower temperatures with increasing the applied field, H_ex; T_B → T_g (the SG phase-transition temperature) as H_ex → 0. The existence of the SG behavior in these samples was also confirmed by frequency (f) dependences of the ac susceptibility. For the in-phase/real component, χ'(T), it shows a frequency-dependent peak at the SG freezing temperature (T_f); T_f → T_g as f → 0. Dynamics of this process were analyzed by means of the slowing down scaling law, τ/τ₀ ∝ (T_f /T_g - 1)-zv, where τ₀ and zv are the characteristic time and critical exponent, respectively. Fitting the experimental T_f (f) data to the scaling law gave the results of zv = 10.1-12.3 and τ₀ = 10^-21-10^-15s. These values are different from those expected for canonical SG systems with zv = 10 and τ₀ = 10^-13s, revealing the cluster-SG behavior of (Nd_1-xY_x)_0.7Sr_0.3MnO₃ samples. Notably, the increase in Y content leads to the shift of τ₀ and zv values toward those of canonical SG systems, which is ascribed to an expansion of SG clusters.
Sponsorship	IEEE Magnetics Society
Starting Page	1
Ending Page	4
Page Count	4
File Size	510436
File Format	PDF
ISSN	00189464
Volume Number	50
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-01-01
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 Temperature measurement Temperature dependence Nonhomogeneous media Magnetization Magnetic susceptibility Magnetic anisotropy spin-glass (SG) behavior Magnetic inhomogeneity perovskite manganites
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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