Double-exchange selection role for the c-axis conductivity in layered La2-2xSr1+2xMn2O7 single crystals below Tc

被引：19

作者：

Li, QA ^{[1
]}

Gray, KE ^{[1
]}

Mitchell, JF ^{[1
]}

Berger, A ^{[1
]}

Osgood, R ^{[1
]}

机构：

[1] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA

来源：

PHYSICAL REVIEW B | 2000年 / 61卷 / 14期

关键词：

D O I：

10.1103/PhysRevB.61.9542

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

For the c-axis conductivity, sigma(c), of the colossal-magnetoresistive layered manganite La1.4Sr1.6Mn2O7 below T-c, experimental evidence supports the double-exchange (DE) selection rule, i.e., sigma(c)similar to cos(2)(eta/2), where eta is the angle between Mn spins in neighboring bilayers. Below T-c, the data also determine the inarbilayer magnetic exchange constant, which is reasonable with respect to recent spin-wave data, and the magnetocrystalline anisotropy. For c-axis fields, a mixed AF and spin-flop state (similar to the intermediate state of type-I superconductors) is a rigorous prediction of the data and modeling.

引用

页码：9542 / 9548

页数：7

共 19 条

[1] CONSIDERATIONS ON DOUBLE EXCHANGE [J].