Golosov DI
NORDITA, Blegdamsvej 17, DK-2100 Copenhagen O, Denmark.
Phys Rev Lett. 2000 Apr 24;84(17):3974-7. doi: 10.1103/PhysRevLett.84.3974.
We construct the 1/S spin wave expansion for double exchange ferromagnets at T = 0. It is assumed that the value of Hund's rule coupling, J(H), is sufficiently large, resulting in a fully saturated, ferromagnetic half-metallic ground state. We evaluate corrections to the magnon dispersion law, and we also find that, in contrast to earlier statements in the literature, magnon-electron scattering does give rise to spin wave damping. We analyze the momentum dependence of these quantities and discuss the experimental implications for colossal magnetoresistance compounds.
我们构建了T = 0时双交换铁磁体的1/S自旋波展开式。假设洪德规则耦合常数J(H)的值足够大，从而产生一个完全饱和的铁磁半金属基态。我们评估了对磁振子色散定律的修正，并且还发现，与文献中早期的说法相反，磁振子-电子散射确实会导致自旋波阻尼。我们分析了这些量的动量依赖性，并讨论了对巨磁阻化合物的实验意义。
