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We examine the evolution of magnetic properties in the normal spinel oxidesMg(1-x)Cu(x)Cr2O4 using magnetization and heat capacity measurements. Theend-member compounds of the solid solution series have been studied in somedetail because of their very interesting magnetic behavior. MgCr2O4 is a highlyfrustrated system that undergoes a first order structural transition at itsantiferromagnetic ordering temperature. CuCr2O4 is tetragonal at roomtemperature as a result of Jahn-Teller active tetrahedral Cu^2+ and undergoes amagnetic transition at 135 K. Substitution of magnetic cations for diamagneticMg^2+ on the tetrahedral A site in the compositional series Mg(1-x)Cu(x)Cr2O4dramatically affects magnetic behavior. In the composition range 0 < x < 0.3,the compounds are antiferromagnetic. A sharp peak observed at 12.5K in the heatcapacity of MgCr2O4 corresponding to a magnetically driven first orderstructural transition is suppressed even for small x suggesting glassydisorder. Uncompensated magnetism - with open magnetization loops - developsfor samples in the x range 0.43 < x < 1. Multiple magnetic orderingtemperatures and large coercive fields emerge in the intermediate compositionrange 0.43 < x < 0.47. The Neel temperature increases with increasing x acrossthe series while the value of the Curie-Weiss Theta decreases. A magnetictemperature-composition phase diagram of the solid solution series ispresented.

Evolution of magnetic properties in the normal spinel solid solution Mg(1-x)Cu(x)Cr2O4