PERSISTENT CURRENT IN THE FERROMAGNETIC KONDO-LATTICE MODEL

In this paper, we study the zero-temperature persistent current in a f erromagnetic Kondo lattice model in the strong coupling limit. In this model, there are spontaneous spin textures at some values of the exte rnal magnetic flux. These spin textures contribute a geometric flux, w hich can induce an additional spontaneous persistent current. Since th is spin texture changes with the external magnetic flux, we find that there is an anomalous persistent current in some region of magnetic fl ux: near Phi/Phi(0)=0 for an even number of electrons and Phi/Phi(0)=1 /2 for an odd number of electrons. [S0163-1829(97)04742-5].