They were first described by the Edwards-Anderson model, but better known is the Sherrington-Kirkpatrick mean-field model of these, proven solvable by Giorgio Parisi.
A classic study on these systems was authored in 1993 by Konrad Fischer and John Hertz. The onset of this order is determined experimentally by a sharp cusp in the temperature dependence of the linear AC susceptibility at the freezing temperature, and a divergence of the non-linear susceptibility at that same temperature. They were first described by the Edwards-Anderson model, but better known is the Sherrington-Kirkpatrick mean-field model of these, proven solvable by Giorgio Parisi. Formed by placing an ion like Europium at random positions in a non-magnetic host metal or insulator – as temperature is lowered, they display static orientations with no long-range magnetic order, ►unlike ferromagnets or antiferromagnets. FTP, name these materials in solid state physics named for their unique magnetic moments.
A classic study on these systems was authored in 1993 by Konrad Fischer and John Hertz.
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