Effect of Y substitution in La-Ca-Mn-O perovskites showing giant magnetoresistance

被引：44

作者：

Mahendiran, R

Mahesh, R

Raychaudhuri, AK

Rao, CNR

机构：

[1] INDIAN INST SCI,JAWAHARLAL NEHRU CTR ADV SCI RES,BANGALORE 560012,KARNATAKA,INDIA

[2] INDIAN INST SCI,DEPT PHYS,BANGALORE 560012,KARNATAKA,INDIA

[3] INDIAN INST SCI,SOLID STATE & STRUCT CHEM UNIT,BANGALORE 560012,KARNATAKA,INDIA

来源：

PHYSICAL REVIEW B | 1996年 / 53卷 / 18期

关键词：

D O I：

10.1103/PhysRevB.53.12160

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Substitution of yttrium (Y3+) in La-Ca-Mn-O perovskites of the ABO(3) structure markedly affects the crystal structure and lattice constants as well as the resistivity (rho), ferromagnetic transition temperature (T-c), and the temperature corresponding to the insulator-metal-like transition (T-p). The two important parameters which control the electronic transport and the magnetic behavior are the Mn4+ content and the effective radius of the A-site cation. The substitution by Y, which changes the A-site radius, is compared to pressure effect. For certain Y concentrations we observe substantial enhancement of the negative magnetoresistance at temperatures T<T-c and a large positive magnetoresistance at T much greater than T-c.

引用

页码：12160 / 12165

页数：6