Structural changes and related effects due to charge ordering in Nd0.5Ca0.5MnO3

被引:111
作者
Vogt, T
Cheetham, AK
Mahendiran, R
Raychaudhuri, AK
Mahesh, R
Rao, CNR
机构
[1] BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973
[2] UNIV CALIF SANTA BARBARA,MAT RES LAB,SANTA BARBARA,CA 93106
[3] INDIAN INST SCI,DEPT PHYS,BANGALORE 560012,KARNATAKA,INDIA
[4] INDIAN INST SCI,SOLID STATE & STRUCT CHEM UNIT,BANGALORE 560012,KARNATAKA,INDIA
来源
PHYSICAL REVIEW B | 1996年 / 54卷 / 21期
关键词
D O I
10.1103/PhysRevB.54.15303
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Charge ordering in L(1-x)A(x)MnO(3) (L=rare earth, A=Ca,Sr) depends strongly on the width of the e(g) band or on the average radius of the A-site cations, [r(A)]. Investigations of Nd0.5Ca0.5MnO3 with a small [r(A)] show evidence for a first -order transition due to charge ordering around 220 K, accompanied by a large decrease in volume (0.45%). Structural data at different temperatures indicate that the distortions within the structure are a direct result of charge ordering. Valence sum calculations show the presence of two differently charged Mn atoms. Electron transport and magnetic susceptibility measurements have been carried out down to low temperatures to understand the nature of the charge-ordered state. The charge-ordered state melts on the application of a magnetic field.
引用
收藏
页码:15303 / 15306
页数:4
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