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Journal of the Korean Physical Society

, Volume 63, Issue 3, pp 512–516 | Cite as

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

  • Takehito Nakano
  • Duong Thi Hanh
  • Akihiro Owaki
  • Yasuo NozueEmail author
  • Nguyen Hoang Nam
  • Shingo Araki
Article

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.

Keywords

Alkali metal Cluster Ferromagnetism Ferrimagnetism Polaron Kondo lattice Zeolite 

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Copyright information

© The Korean Physical Society 2013

Authors and Affiliations

  • Takehito Nakano
    • 1
  • Duong Thi Hanh
    • 1
  • Akihiro Owaki
    • 1
  • Yasuo Nozue
    • 1
    Email author
  • Nguyen Hoang Nam
    • 2
  • Shingo Araki
    • 3
  1. 1.Department of Physics, Graduate School of ScienceOsaka UniversityOsakaJapan
  2. 2.Center for Materials Science, Faculty of Physics, Hanoi University of ScienceVietnam National UniversityHanoiViet Nam
  3. 3.Graduate School of Natural Science and TechnologyOkayama UniversityOkayamaJapan

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