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primary topic: Inhomogeneous ferromagnetism and spin-glass-like behaviour in (Nd1-xYx)0.7Sr0.3MnO3 with x = 0.21 - 0.35

Inhomogeneous ferromagnetism and spin-glass-like behaviour in (Nd1-xYx)0.7Sr0.3MnO3 with x = 0.21 - 0.35
type: AcademicArticle
type: Article
abstract: The magnetic properties of polycrystalline ceramic samples (Nd1-xYx)0.7Sr0.3MnO3 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 (TC) 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 (TB) below TC, which shifts toward lower temperatures with increasing the applied field, Hex; TB → Tg (the SG phase-transition temperature) as Hex → 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 (Tf); Tf → Tg as f → 0. Dynamics of this process were analyzed by means of the slowing down scaling law, τ/τ0 ∝ (Tf /Tg - 1)-zv, where τ0 and zv are the characteristic time and critical exponent, respectively. Fitting the experimental Tf (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 (Nd1-xYx)0.7Sr0.3MnO3 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 expansi- n of SG clusters.
date: 2014
volume: 50
issue: 6
is part of: IEEE Transactions on Magnetics
status: peerReviewed
status: published
author list: authors
type: EPrint
type: ArticleEPrint
is part of: repository
subject: Engineering Physics
subject: ISI-indexed journals

IEEE
type: Organization

IEEE Transactions on Magnetics
type: Collection
issn: 00189464

V. Khiem Nguyen
type: Person
given name: V. Khiem
family name: Nguyen

S.C. Yu
type: Person
given name: S.C.
family name: Yu

D. Thanh Tran
type: Person
given name: D. Thanh
family name: Tran

X. Phuc Nguyen
type: Person
given name: X. Phuc
family name: Nguyen

Duc Thang Pham
type: Person
given name: Duc Thang
family name: Pham

T.L Phan
type: Person
given name: T.L
family name: Phan

V.D Nguyen
type: Person
given name: V.D
family name: Nguyen

T.A Ho
type: Person
given name: T.A
family name: Ho

HTML Summary of #1265 Inhomogeneous ferromagnetism and spin-glass-like behaviour in (Nd1-xYx)0.7Sr0.3MnO3 with x = 0.21 - 0.35
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primary topic: Inhomogeneous ferromagnetism and spin-glass-like behaviour in (Nd1-xYx)0.7Sr0.3MnO3 with x = 0.21 - 0.35

Engineering Physics
type: Concept

ISI-indexed journals
type: Concept