Sun Ping, Kotliar Gabriel
Center for Materials Theory, Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854-8019, USA.
Phys Rev Lett. 2003 Jul 18;91(3):037209. doi: 10.1103/PhysRevLett.91.037209.
We investigate the competition of the Kondo and the RKKY interactions in heavy fermion systems. We solve a periodic Anderson model using extended dynamical mean field theory (EDMFT) with quantum Monte Carlo method. We monitor simultaneously the evolution of the electronic and magnetic properties. As the RKKY coupling increases the heavy fermion quasiparticle unbinds and a local moment forms. At a critical RKKY coupling there is an onset of magnetic order. Within EDMFT the two transitions occur at different points and the disappearance of the magnetism is not described by a local quantum critical point.
我们研究了重费米子系统中近藤相互作用和RKKY相互作用的竞争。我们使用扩展动态平均场理论（EDMFT）和量子蒙特卡罗方法求解周期性安德森模型。我们同时监测电子和磁性质的演化。随着RKKY耦合的增加，重费米子准粒子解束缚并形成局域磁矩。在临界RKKY耦合时，出现磁有序。在EDMFT中，这两个转变发生在不同的点，并且磁性的消失不是由局域量子临界点描述的。
