e-Journal of Surface Science and Nanotechnology
Online ISSN : 1348-0391
ISSN-L : 1348-0391
Conference -Handai Nano 2006-
Magnetic and Optical Properties of Rb and Cs Clusters Incorporated into Zeolite A
Truong Cong DuanTakehito NakanoYasuo Nozue
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2007 Volume 5 Pages 6-11


Optical and magnetic properties are studied on Rb and Cs clusters incorporated into the cages of aluminosilicate zeolite A (structure type code LTA), where α and β cages with inside diameters of ∼1.1 and ∼0.7 nm, respectively, are arrayed in a simple cubic structure. The average number of guest alkali atoms per α cage, n, was changed from dilute loading to ∼5 and ∼3.5 for Rb and Cs, respectively. At n > 2, the absorption coefficient at mid-infrared region increases significantly. This is assigned to a contribution of the Drude term in a metallic phase. The change from insulating phase to the metallic one is ascribed to a wider bandwidth of the 1p state of clusters compared with that of the 1s state. All samples show Curie-Weiss law with negative Weiss temperatures. In Rb clusters, both of the Curie constant and the absolute value of Weiss temperature gradually increases with increasing n at n > 2, and ferromagnetic properties are clearly found at n > 4. This n-dependence is essentially different from that in ferromagnetism in K clusters at n > 2. Cs clusters shows quite small values of Curie constant at n > 2 and also non-ferromagnetic behavior up to the maximum value of n. [DOI: 10.1380/ejssnt.2007.6]

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