The Colossal Magnetoresistance CMR Phenomenon

The composition (Lai j,Pry)o.7Cao.3Mn03 represents a model system for understanding the CMR phenomenon and adjusting its parameters ]99]. The parent compounds LaMn03 and PrMn03 are A-type antiferromagnets, due to the 

not only Tc but also the magnitude of the magnetoresistance effect are strongly affected by the average size of the (Lni jA x) cations. 

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