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 language | English |
---|---|
Pages (from-to) | 512-516 |
Number of pages | 5 |
Journal | Journal of the Korean Physical Society |
Volume | 63 |
Issue number | 3 |
DOIs | |
Publication status | Published - Aug 2013 |
Keywords
- Alkali metal
- Cluster
- Ferrimagnetism
- Ferromagnetism
- Kondo lattice
- Polaron
- Zeolite
ASJC Scopus subject areas
- Physics and Astronomy(all)