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Insulator-to-metal transition and magnetism of potassium metals loaded into regular cages of zeolite LSX

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Abstract

Zeolite LSX (low-silica X) crystals have an aluminosilicate framework with regular supercages and β-cages. They are arrayed in a double diamond structure. The loading density of guest K atoms per supercage (or β cage), n, can be controlled from 0 to ≈ 9. At n < 2, samples are nearly nonmagnetic and insulating. The Curie constant has a clear peak at n = 3, and the electrical resistivity suddenly decreases simultaneously. The electrical resistivity suddenly decreases again at n = 6 and shows metallic phase at n > 6. These properties are explained by the polaron effect including the electron correlation. Ferrimagnetic properties are observed at n ≈ 9. A remarkable increase in the resistivity is observed at very low temperatures at n ≈ 9, and is discussed in terms of the hypothesis of a Kondo insulator.

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Authors and Affiliations

  1. Department of Physics, Graduate School of Science, Osaka University, Osaka, 560-0043, Japan

    Takehito Nakano, Duong Thi Hanh, Akihiro Owaki & Yasuo Nozue

  2. Center for Materials Science, Faculty of Physics, Hanoi University of Science, Vietnam National University, Hanoi, Viet Nam

    Nguyen Hoang Nam

  3. Graduate School of Natural Science and Technology, Okayama University, Okayama, 700-0082, Japan

    Shingo Araki

Authors
  1. Takehito Nakano
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  2. Duong Thi Hanh
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  3. Akihiro Owaki
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  4. Yasuo Nozue
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  5. Nguyen Hoang Nam
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  6. Shingo Araki
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Corresponding author

Correspondence to Yasuo Nozue.

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Nakano, T., Thi Hanh, D., Owaki, A. et al. Insulator-to-metal transition and magnetism of potassium metals loaded into regular cages of zeolite LSX. Journal of the Korean Physical Society 63, 512–516 (2013). https://doi.org/10.3938/jkps.63.512

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  • DOI: https://doi.org/10.3938/jkps.63.512

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