Ionic Conduction and Ultrasonic Velocity in Na_1+2ninmbixZr_2-xMn_x(PO₄)₃

Abstract

A model for amorphous magnetism is presented. The model predicts a reduction of the magnetisation from its value for a crystalline ferromagnet and shows that spin glass behaviour in amorphous magnets is likely to be a common occurrence. The conditions for a spin glass transition are related to the slope and/or curvature of the exchange potential as a function of the interionic distance in the amorphous magnet.