Spin-state transition in La1-xSmxCoO3 perovskites

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	Spin-state transition in La1-xSmxCoO3 perovskites
	Sun, JR ; Li, RW ; Shen, BG
刊名	JOURNAL OF APPLIED PHYSICS
	2001
卷号	89 期号:2 页码:1331
关键词	LA1-XSRXCOO3 LACOO3
ISSN号	0021-8979
通讯作者	Sun, JR (reprint author), Chinese Acad Sci, Ctr Condensed Matter Phys, State Key Lab Magnetism, Beijing 100080, Peoples R China.
中文摘要	Structural and magnetic properties of La1-xSmxCoO3 with x=0, 0.02, 0.04, 0.06, 0.08, 0.12, 0.16, and 0.2 have been systematically studied. LaCoO3 exhibits a rhombohedral structure of R (3) over barC symmetry. The lattice parameters decrease progressively with the incorporation of Sm, and a second orthorhombic phase of Pbnm symmetry appears for x greater than or equal to0.12. The volume fraction of the orthorhombic phase is a sensitive function of the Sm content in the compounds, and increases from 16% for x=0.12 to 75% for x=0.2. Accordingly, the low-spin-to-high-spin transition of the trivalent Co ions, characterized by a steep rise of the magnetization, shifts to higher temperatures. A molecular field analysis indicates an increased energy gap, from 317 K for x=0 to 500 K for x=0.2, between the low-spin and the high-spin state, implying a stabilization of the low-spin trivalent Co ions by the presence of Sm. The enhanced compressive chemical pressure due to the introduction of Sm is suggested to be responsible for the present observations. (C) 2001 American Institute of Physics.
收录类别	SCI
语种	英语
公开日期	2013-09-24
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/52952]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Sun, JR,Li, RW,Shen, BG. Spin-state transition in La1-xSmxCoO3 perovskites[J]. JOURNAL OF APPLIED PHYSICS,2001,89(2):1331.
APA	Sun, JR,Li, RW,&Shen, BG.(2001).Spin-state transition in La1-xSmxCoO3 perovskites.JOURNAL OF APPLIED PHYSICS,89(2),1331.
MLA	Sun, JR,et al."Spin-state transition in La1-xSmxCoO3 perovskites".JOURNAL OF APPLIED PHYSICS 89.2(2001):1331.