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

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• 作者：Takehito Nakano (1)
  Duong Thi Hanh (1)
  Akihiro Owaki (1)
  Yasuo Nozue (1)
  Nguyen Hoang Nam (2)
  Shingo Araki (3)
  
• 关键词：Alkali metal ; Cluster ; Ferromagnetism ; Ferrimagnetism ; Polaron ; Kondo lattice ; Zeolite
• 刊名：Journal of the Korean Physical Society
• 出版年：2013
• 出版时间：August 2013
• 年：2013
• 卷：63
• 期：3
• 页码：512-516
• 全文大小：249KB
• 参考文献：1. T. Nakano, N. H. Nam, T. C. Duan, D. T. Hanh, S. Araki and Y. Nozue, to be published in J. Kor. Phys. Soc.
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• 作者单位：Takehito Nakano (1)
  Duong Thi Hanh (1)
  Akihiro Owaki (1)
  Yasuo Nozue (1)
  Nguyen Hoang Nam (2)
  Shingo Araki (3)
  
  1. Department of Physics, Graduate School of Science, Osaka University, Osaka, 560-0043, Japan
  2. Center for Materials Science, Faculty of Physics, Hanoi University of Science, Vietnam National University, Hanoi, Viet Nam
  3. Graduate School of Natural Science and Technology, Okayama University, Okayama, 700-0082, Japan
  
• ISSN：1976-8524

文摘

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.