材料期刊网

Theoretical model of an organic ferrimagnetic state for a bipartite lozenge chain

Physical Review B

A model for one-dimensional bipartite lozenge chain is proposed. By unrestricted Hartree-Fock approximation, we find that the system should exhibit ferrimagnetic ordering for a half filled band. In the ground state, the energy levels of electrons will split off with respect to different spins and the electrons along the chain will form an antiferromagnetic spin-density wave. The ground state of the system will be more stable with increasing of the on-site Hubbard term.

关键词: ferromagnet

铁磁/超导/铁磁异质结中的态密度谱和局域磁矩

任亚杰 , 孟豪 , 卿云帆

低温物理学报

通过自洽求解Bogoliubov-de Gennes (BdG)方程研究不同交换场下铁磁和超导之间的相互作用.我们发现超导体内的自旋单态能够穿透进入铁磁体并能在铁磁体内产生一个“子能隙”.不同自旋的“子能隙”随着铁磁交换场的增加会在能谱中发生相对移动,形成各种不同结构的态密度.另外,铁磁体的反邻近效应能够在超导区域引起一个局域磁矩.该磁矩会随着铁磁交换场的增加由负变正,这与界面附近超导和铁磁之间的相互竞争有关.

关键词: 铁磁 , 超导 , 0-π转变 , 邻近效应 , 反邻近效应