Cluster glass behavior of frustrated birnessites AxMnO2*yH2O (A = Na, K)
L. D. Kulish, R. Scholtens, G. R. Blake
TL;DR
This study investigates the magnetic properties of frustrated birnessite compounds Na0.22MnO2*0.39H2O and K0.6MnO2*0.48H2O, revealing cluster glass behavior at low temperatures through detailed magnetic measurements and analysis.
Contribution
It provides new insights into the magnetic behavior of birnessite structures, demonstrating cluster glass phenomena in specific sodium and potassium variants.
Findings
Cluster glass behavior observed below 4 K for Na-birnessite.
Cluster glass behavior observed below 6 K for K-birnessite.
Frequency dependence of freezing temperature confirmed by scaling laws.
Abstract
We report on the synthesis and magnetic properties of frustrated Na0.22MnO2*0.39H2O and K0.6MnO2*0.48H2O with the birnessite structure. The structure, static and dynamic magnetic properties of the compounds are investigated in detail. A combination of DC and AC magnetic susceptibility measurements and magnetization decay measurements reveal cluster glass behavior below the freezing temperature of 4 K for Na-birnessite and 6 K for K-birnessite. The frequency dependence of the freezing temperature is analyzed on the basis of dynamic scaling laws including the critical slowing down formula and the Vogel-Fulcher law, which further confirm cluster glass formation in both compounds.
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