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Electronic and magnetic phase diagram of La0.5Sr0.5Co1-xFexO3 (0 <= x <= 0.6) perovskites

Authors
Phan, TLYu, SCVan Khiem, NPhan, MHRhee, JRPhuc, NX
Issue Date
May-2005
Publisher
AMER INST PHYSICS
Citation
JOURNAL OF APPLIED PHYSICS, v.97, no.10
Journal Title
JOURNAL OF APPLIED PHYSICS
Volume
97
Number
10
URI
https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/15504
DOI
10.1063/1.1855197
ISSN
0021-8979
1089-7550
Abstract
Spin dynamics and magnetic frustration effects in La0.5Sr0.5Co1-xFeO3 (0 <= x <= 0.6) compounds were systematically studied by means of resistivity, dc magnetization, ac susceptibility, and electron-spin-resonance spectra. The Fe substitution caused a metal-semiconductor transition for x <= 0.3 compositions whereas the only semiconducting state behaved for x > 0.3 compositions. With increasing Fe-doping levels, the ferromagnetic-paramagnetic transition temperature, T-C, decreased from 250(x=0) to 166 K (x=0.4). Aspin-glass behavior was observed for x > 0.4 compositions and is attributed to the frustration of random competing exchange interactions, namely, the ferromagnetic Co3+-CO4+ double-exchange interaction and the antiferromagnetic interactions such as Co-O-Fe and Fe-O-Fe. The internal dynamic properties of the samples were elucidated by the,electron-paramagnetic-resonance spectra. An electronic and magnetic phase diagram of La0.5Sr0.5Co1-xFexO3 is drawn up. (c) 2005 American Institute of Physics.
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