Antiferromagnetic phase transition of K-Rb alloy nanoclusters incorporated in sodalite
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We prepared Rb-rich K-Rb alloy nanoclusters arrayed in the regular nanospace of aluminosilicate sodalite which has a bcc arrangement of cages. The average chemical formula of the cluster is (K1.5Rb2.5)3+, where one unpaired s-electron is shared by four alkali cations and is confined in a cage. The magnetic susceptibility and the electron spin resonance clearly show an antiferromagnetic phase transition at a Néel temperature T N of approximately 90–100 K. The observed T N is higher than that in K 4 3+ (T N = 72 K) and (K3Rb)3+ clusters (T N = 80 K) in sodalites. This result indicates a systematic enhancement of the antiferromagnetic exchange coupling between the adjacent nanoclusters by substituting Rb atoms for K ones. The size and the spatial distribution of the s-electron wave function in the nanocluster play a key role in the exchange coupling.
KeywordsAntiferromagnetism Alkali-metal cluster Zeolite Sodalite
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