Role of calcium ions as doped-hole attractors in destabilizing charge-ordered states in Mn perovskites -: art. no. 172410

被引：10

作者：

Alonso, J

Arroyo, A

González-Calbet, JM

Vallet-Regí, M

Martínez, JL

Rojo, JM

Hernando, A

机构：

[1] UCM, CSIC, RENFE, Inst Magnetismo Aplicado, Madrid 28230, Spain

[2] CSIC, ICMM, E-28049 Madrid, Spain

[3] UCM, Dept Fis Mat, Madrid 28040, Spain

来源：

PHYSICAL REVIEW B | 2001年 / 64卷 / 17期

关键词：

D O I：

10.1103/PhysRevB.64.172410

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Magnetization and resistivity measurements have been performed in (La1-xCax)(z)MnO3-delta perovskites as a function of x, z, and delta around the charge-ordered state. Fifty percent of Ca ions stabilize the charge-ordered state even for Mn4+ as low as 40% whereas reducing that impurity concentration to 35% results in a conducting ferromagnetic state even for 50% of Mn4+ ions. A model is proposed in which Ca ions act not only as suppliers of holes but as attractors of doped-in holes.

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页数：4

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