eprintid: 1265
rev_number: 12
eprint_status: archive
userid: 5
dir: disk0/00/00/12/65
datestamp: 2015-11-09 05:46:23
lastmod: 2015-11-09 05:56:39
status_changed: 2015-11-09 05:46:23
type: article
metadata_visibility: show
creators_name: Phan, T.L
creators_name: Nguyen, V.D
creators_name: Ho, T.A
creators_name: Nguyen, V. Khiem
creators_name: Tran, D. Thanh
creators_name: Nguyen, X. Phuc
creators_name: Pham, Duc Thang
creators_name: Yu, S.C.
creators_id: pdthang@vnu.edu.vn
title: Inhomogeneous ferromagnetism and spin-glass-like behaviour in (Nd1-xYx)0.7Sr0.3MnO3 with x = 0.21 - 0.35
ispublished: pub
subjects: Phys
subjects: isi
divisions: fac_physic
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
date_type: published
publisher: IEEE
official_url: Doi: 10.1109/TMAG.2014.2300852
full_text_status: none
publication: IEEE Transactions on Magnetics
volume: 50
number: 6
pagerange: 2502204
refereed: TRUE
issn: 0018-9464
citation:   Phan, T.L and Nguyen, V.D and Ho, T.A and Nguyen, V. Khiem and Tran, D. Thanh and Nguyen, X. Phuc and Pham, Duc Thang and Yu, S.C.  (2014) Inhomogeneous ferromagnetism and spin-glass-like behaviour in (Nd1-xYx)0.7Sr0.3MnO3 with x = 0.21 - 0.35.  IEEE Transactions on Magnetics, 50  (6).   p. 2502204.  ISSN 0018-9464