eprintid: 1264
rev_number: 11
eprint_status: archive
userid: 5
dir: disk0/00/00/12/64
datestamp: 2015-11-09 05:51:15
lastmod: 2015-11-09 05:53:06
status_changed: 2015-11-09 05:51:15
type: article
metadata_visibility: show
creators_name: Phan, The Long
creators_name: Ho, T.A
creators_name: Pham, Duc Thang
creators_name: Tran, Q.T
creators_name: Tran, D. Thanh
creators_name: Nguyen, X. Phuc
creators_name: Phan, M. H
creators_name: Bui, T. Huy
creators_name: Yu, S.C.
creators_id: pdthang@vnu.edu.vn
title: Critical Behavior of Y-doped Nd0.7Sr0.3MnO3 Manganites Exhibiting the Tricritical Point and Large Magnetocaloric Effect
ispublished: pub
subjects: Phys
subjects: isi
divisions: fac_physic
abstract: We have determined the values of critical exponents of two polycrystalline samples (Nd1−xYx)0.7Sr0.3MnO3 (x = 0 and 0.07) from the magnetization data versus temperature and magnetic field, M(H, T), to learn about their magnetic and magnetocaloric (MC) properties. The results reveal the samples exhibiting the crossover of first-order and second-order phase transitions, where the exponent values β = 0.271 and γ = 0.922 for x = 0, and β = 0.234–0.236 and γ = 1.044–1.063 for x = 0.07 determined by using modified Arrott plots and static-scaling hypothesis are close to those expected for the tricritical mean-field theory (β = 0.25 and γ = 1.0). Particularly, the TC of x = 0 and 0.07 can be any value in the temperature ranges of 240–255 K and 170–278 K, respectively, depending on the magnitude of applied magnetic field and determination techniques. Around the TC, studying the MC effect of the samples has revealed a large magnetic-entropy change (ΔSm) up to ∼8 J/kg K for the applied field interval ΔH = 50 kOe, corresponding to refrigerant capacity values of 200–245 J/kg. These phenomena are related to the crossover nature and the persisting of FM/anti-FM interactions even above the TC, as further confirmed by electron-spin-resonance data, Curie–Weiss law-based analyses, and an exponential parameter characteristic of magnetic order n = dLn|ΔSm|/dLnH.
date: 2014
date_type: published
official_url: doi:10.1016/j.jallcom.2014.06.107
full_text_status: none
publication: Journal of Alloys and Compounds
volume: 615
pagerange: 937-945
refereed: TRUE
issn: 0925-8388
citation:   Phan, The Long and Ho, T.A and Pham, Duc Thang and Tran, Q.T and Tran, D. Thanh and Nguyen, X. Phuc and Phan, M. H and Bui, T. Huy and Yu, S.C.  (2014) Critical Behavior of Y-doped Nd0.7Sr0.3MnO3 Manganites Exhibiting the Tricritical Point and Large Magnetocaloric Effect.  Journal of Alloys and Compounds, 615 .   pp. 937-945.  ISSN 0925-8388