MAGNETIC AND OPTICAL PROPERTIES OF SODIUM CLUSTERS IN ZEOLITE LTA

Tetsuya Kodaira, Yasuo Nozue, Satoshi Ohwashi, Nozomu Togashi and Osamu Terasaki
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Tetsuya Kodaira: National Institute for Advanced Interdisciplinary Research (NAIR), 1–1–4 Higashi, Tsukuba, Ibaraki 305, Japan
Yasuo Nozue: Department of Physics, Faculty of Science, Tohoku University, Aramaki Aoba Ku, Sendai 980, Japan
Satoshi Ohwashi: Department of Physics, Faculty of Science, Tohoku University, Aramaki Aoba Ku, Sendai 980, Japan
Nozomu Togashi: Department of Physics, Faculty of Science, Tohoku University, Aramaki Aoba Ku, Sendai 980, Japan
Osamu Terasaki: Department of Physics, Faculty of Science, Tohoku University, Aramaki Aoba Ku, Sendai 980, Japan

Surface Review and Letters (SRL), 1996, vol. 03, issue 01, 717-720

Abstract: Cationic Na clusters are formed in the α and β cages of Na-form LTA by incorporating Na atoms from vapor. The maximum number of Na atoms incorporated is 4.9 per unit cell. Ac magnetic susceptibilities and optical reflection spectra are measured as a function of Na loading density. Na clusters show diamagnetism independent of Na loading density while K clusters in K-LTA and Rb clusters in Rb-LTA show ferromagnetism at certain loading densities. All Na clusters contain therefore an even number of the electrons, which are supplied from 3s-electrons of the guest Na atoms, irrespective of the cages they are formed. The electron-phonon interaction plays an important role in stabilizing the singlet state. In the reflection spectra of highly loaded sample, a strong band is observed at 1.95 eV. An oscillator strength of this band exceeds unity per cluster by a great deal. This band is assigned to surface-plasmon-like excitation of Na cluster formed in α cage.

Date: 1996
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DOI: 10.1142/S0218625X96001297

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