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Here we present a comparative study of the magnetic and crystal chemicalproperties of two Co2+ containing garnets, NaCa2Co2V3O12 and CaY2Co2Ge3O12.Both phases exhibit the onset of antiferromagnetic order at 8K and 6Krespectively, as well as field-induced transitions in their magnetization at 1Tand around 11 T. We find these field-dependent transitions correspond toquantum critical points that result in the suppression of antiferromagneticorder and that these transitions can be clearly seen using magnetocapacitancemeasurements. Finally, we perform detailed crystal chemistry analyses andcomplimentary density functional theory calculations to show that changes inthe local environment of the Co-ions are responsible for differences in the twomagnetic structures and their respective properties.

Magnetodielectric effects at quantum critical fields in cobalt-containing garnets