Magnetism of Ce(Pd_1-xM_x)₂Al₃(M=Ag, Cu) Based on RKKY Interaction

Abstract

In Ce(Pd 1−x M x ) 2 Al 3 (M = Ag, Cu), the (0, 0, 1/2)-antiferromagnetic (AF), ferromagnetic (F), and another AF orders are observed for x < 0.05, 0.1 < x < 0.4, and 0.5 < x, respectively. This change in the ordering vector is considered to be caused by the change in the conduction-band structures, and is studied theoretically using the anisotropic RKKY interaction model reflecting the spacial anisotropic distribution of the f states and also the conduction-band structures. As a result, the variation of the ordering vector is explained by treating the substitution of atoms as the conduction-electron doping, and the ordering vector of the AF state for x > 0.5 is considered to be (1/2, 0, 1/2).

Simultaneous loss of interlayer coherence and long-range magnetism in quasi-two-dimensional PdCrO2

“…In quasi-two-dimensional (Q2D) systems that are both metallic and magnetic, the (weak) electronic coupling between the conducting planes can also influence the interlayer exchange coupling J ′. Although the effect of electronic coupling on the magnetic ordering—for example via the Ruderman–Kittel–Kasuya–Yosida (RKKY) interaction1234—has been widely studied56, there has been very little experimental exploration of the effect of magnetism itself on the interlayer electronic coupling and on the electronic dimensionality.…”