Magnetic percolation and giant spontaneous Hall effect in La1-xCaxCoO3 (0.2≤x≤0.5)

被引：48

作者：

Samoilov, AV ^{[1
]}

Beach, G

Fu, CC

Yeh, NC

Vasquez, RP

机构：

[1] CALTECH, Dept Phys 11436, Pasadena, CA 91125 USA

[2] CALTECH, Jet Prop Lab, Ctr Space Microelect Technol, Pasadena, CA 91125 USA

来源：

PHYSICAL REVIEW B | 1998年 / 57卷 / 22期

关键词：

D O I：

10.1103/PhysRevB.57.R14032

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report an unprecedentedly large spontaneous Hall effect in ferromagnetic La1-xCaxCoO3 (0.2 less than or equal to x less than or equal to 0.5) epitaxial films. The effect exceeds existing theoretical predictions for the value of the spontaneous Hall resistivity rho(xy) by several orders of magnitude. The Hall effect is the strongest for x=0.2, which is at a doping level nearest to the ferromagnetic percolation threshold in La1-xCaxCoO3. We suggest that the coexistence of high-and low-spin configurations in the perovskite cobaltites, together with the magnetic percolation behavior, may be responsible for the giant Hall effect.

引用

页码：14032 / 14035

页数：4

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