Cluster-glass state in manganites induced by A-site cation-size disorder

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	Cluster-glass state in manganites induced by A-site cation-size disorder
	K. F. Wang ; Y. Wang ; L. F. Wang ; S. Dong ; D. Li ; Z. D. Zhang ; H. Yu ; Q. C. Li ; J. M. Liu
刊名	Physical Review B
	2006
卷号	73 期号:13
关键词	phase-separation colossal magnetoresistance transition-temperature griffiths phase double-exchange pr0.6ca0.4mno3 magnetization resistivity perovskites behavior
ISSN号	1098-0121
中文摘要	The dependence of magnetotransport behaviors on A-site disorder induced by A-site cational size mismatch in ferromagnetic manganites is investigated by characterizing a series of samples with the same A-site cational mean radius < r(A)>=1.20 angstrom but different A-site ionic radii variance sigma(2)=Sigma(i)x(i)r(i)(2)-< r(A)>(2), where x(i) and r(i) are the atomic fraction and ionic radii of i-type ions at A-site, respectively. It is revealed that the ground state transits from ferromagnetic metal to cluster-glass insulator upon increasing the variance sigma(2) from 0.0003 for La0.55Ca0.45MnO3 to 0.015 for Sm-0.55(Ca0.6Ba0.4)(0.45)MnO3, while the crystallographic structure and lattice constants of these manganites remain unchanged. Nevertheless, the increasing A-site disorder is believed to enhance the random local radial distortion of MnO6 octahedra and suppress the ferromagnetic long-range order. In the manganites of high A-site disorder, the long-range ferromagnetic ordering is completely melted into the short-range magnetically ordered clusters and then the stepwise magnetization. With decreasing temperature, the short-range ordered clusters become frustrated at the frustrating point, below which a cluster-glass transition occurs due to the weak intercluster interaction.
原文出处	://WOS:000237153800065
公开日期	2012-04-14
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/34513]
专题	金属研究所_中国科学院金属研究所
推荐引用方式 GB/T 7714	K. F. Wang,Y. Wang,L. F. Wang,et al. Cluster-glass state in manganites induced by A-site cation-size disorder[J]. Physical Review B,2006,73(13).
APA	K. F. Wang.,Y. Wang.,L. F. Wang.,S. Dong.,D. Li.,...&J. M. Liu.(2006).Cluster-glass state in manganites induced by A-site cation-size disorder.Physical Review B,73(13).
MLA	K. F. Wang,et al."Cluster-glass state in manganites induced by A-site cation-size disorder".Physical Review B 73.13(2006).