Bloch and Lemaire

The negative pressure derivative (dTddp) of RC02 compounds (Voiron and Bloch, 1971) is related dominantly to the pressure dependence of the enhanced susceptibility. Here the pressure dependence of the enhanced susceptibility is used to calculate, within the exchange enhanced model (Bloch and Lemaire, 1970), the pressure dependence of Tc, which agrees well with the experimental data (Voiron et al., 1973). Jaakkola et al. (1975) discussed qualitatively the... 

Bloch and Lemaire (1970) developed a model for describing two-component alloys in which one component A has a permanent localized moment and the other B an exchange enhanced paramagnetic susceptibility. This B component can possess an exchange induced moment of itinerant nature induced by interaction with the localized A moment. In the paramagnetic temperature range the respective, components are assumed to have magnetizations Ma and Mb in... 

The transition temperature to the magnetically ordered state can be written as (Bloch and Lemaire 1970)... 

The Neel model for ferrimagnets also gives a non-linear (1/y, T) behaviour above Tq for localized A and B moments. This behaviour becomes linear at high temperatures. Burzo (1972b) presented an interpretation, different from the Bloch-Lemaire model, in which he analysed the paramagnetic data according to this Neel model where the paramagnetic susceptibility is expressed by... 

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