Eigenstates and Phase Transitions of Ising Spin Network Immersed in the Incommensurate Exchange Field

概要

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A simple incommensurate mean field model is introduced to explain complexmagnetic phase diagrams of various rare-earth intermetallic compounds such as CeSband CeBi. The eigenstates and their energies of the Ising spin chain immersed in the ex-change field with magnitude J, wave vector k and phase J are determined. The spinS(r) is assumed to point in the local field direction. The eigenstates are classified intothree groups, the irrational states, rational states {A} with J=0 and rational states{A} with lt=n/2n where n is the state index given by a positive integer. The phasediagram of CeSb is sketched by the model. It is emphasized that the present modelsuggests an effect of the spin coupling to the formation of conduction band electronsand the effect on the heavy fermion and superconductivity is discussed.
社団法人日本物理学会の論文
1988-11-15