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Magnetic And Optical Properties Of Sodium Clusters In Zeolite Lta

Author

Listed:
  • 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)

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.

Suggested Citation

  • Tetsuya Kodaira & Yasuo Nozue & Satoshi Ohwashi & Nozomu Togashi & Osamu Terasaki, 1996. "Magnetic And Optical Properties Of Sodium Clusters In Zeolite Lta," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 3(01), pages 717-720.
    • Handle: RePEc:wsi:srlxxx:v:03:y:1996:i:01:n:s0218625x96001297
    DOI: 10.1142/S0218625X96001297
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