Theory of spin-wave excitation in manganites

被引：19

作者：

Maezono, R ^{[1
]}

Nagaosa, N ^{[1
]}

机构：

[1] Univ Tokyo, Dept Appl Phys, Bunkyo Ku, Tokyo 1138656, Japan

来源：

PHYSICAL REVIEW B | 2000年 / 61卷 / 02期

关键词：

D O I：

10.1103/PhysRevB.61.1189

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The role of the orbital degrees of freedom is studied theoretically for the spin dynamics of R(1-x)A(x)MnO(3). Based on the mean-field solution, a random-phase approximation calculation has been done and it is found that the d(x2-y2)-type orbital is essential for the double exchange (DE) interactions, i.e., the DE is basically a two-dimensional interaction. Based on this result compared with experiments, we propose that the orbital wave function is d(x2-y2)-type locally even in the metallic ferromagnetic state, which fluctuates quantum mechanically. Good agreement of the estimation with experiments suggests that the Jahn-Teller phonon has less importance on the spin dynamics.

引用

页码：1189 / 1192

页数：4

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