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

Takehito Nakano, Duong Thi Hanh, Akihiro Owaki, Yasuo Nozue, Nguyen Hoang Nam, Shingo Araki

Research output: Contribution to journalArticle

7 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)512-516
Number of pages5
JournalJournal of the Korean Physical Society
Volume63
Issue number3
DOIs
Publication statusPublished - Aug 2013

Keywords

  • Alkali metal
  • Cluster
  • Ferrimagnetism
  • Ferromagnetism
  • Kondo lattice
  • Polaron
  • Zeolite

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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