过渡金属超晶格的磁性

Magnetism of Transition Metal Superlattices

近来,磁性超晶格的理论研究正引起人们的兴趣.已有的理论工作大多都基于Heisenberg 模型.然而,在磁性过渡金属中 d 电子是巡游的而不是局域在原子格点上.关于过渡金属巡游磁性的研究通常是基于 Hubbard 模型.本文将讨论由 Hubbard 模型描述的超晶格,其结果将更接近过渡金属的实际情况.

The magnetism of metallic superlatticcs described by a Hubbard model is studied.Under the mean field approximation and a Gaussian app- roximation to the electronic density of states up to the second moments,the spontaneous magnetization iscaleulated,the results show that under proper conditions,the magnetism may be enhanced in superlattices.