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We report on the synthesis and magnetic properties of frustratedNa0.22MnO2*0.39H2O and K0.6MnO2*0.48H2O with the birnessite structure. Thestructure, static and dynamic magnetic properties of the compounds areinvestigated in detail. A combination of DC and AC magnetic susceptibilitymeasurements and magnetization decay measurements reveal cluster glass behaviorbelow the freezing temperature of 4 K for Na-birnessite and 6 K forK-birnessite. The frequency dependence of the freezing temperature is analyzedon the basis of dynamic scaling laws including the critical slowing downformula and the Vogel-Fulcher law, which further confirm cluster glassformation in both compounds.

Cluster glass behavior of frustrated birnessites AxMnO2*yH2O (A = Na, K)