| Issue |
EPL
Volume 91, Number 5, September 2010
|
|
|---|---|---|
| Article Number | 57002 | |
| Number of page(s) | 5 | |
| Section | Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties | |
| DOI | https://doi.org/10.1209/0295-5075/91/57002 | |
| Published online | 20 September 2010 | |
Insulator-to-metal phase transition in Yb-based Kondo insulators
1
Department of Physics, Tsinghua University - Beijing 100084, China
2
Institute of Physics, Chinese Academy of Sciences - Beijing 100190, China
3
Institute of Theoretical Physics, Chinese Academy of Sciences - Beijing 100190, China
Received:
10
May
2010
Accepted:
20
August
2010
The periodic Anderson lattice model for the crystalline electric field (CEF) split 4f quartet states is used to describe the Yb-based Kondo insulators. In the slave-boson mean-field approximation, we derive the hybridized quasiparticle bands, and surprisingly find that decreasing the hybridization difference of the two CEF quartets may induce a continuous insulator-to-metal phase transition. The resulting metallic phase has a hole and an electron Fermi pocket. Such a phase transition may be realized experimentally by applying pressure, reducing the difference in hybridization of the two CEF quartets in real materials.
PACS: 75.30.Mb – Valence fluctuation, Kondo lattice, and heavy-fermion phenomena / 71.27.+a – Strongly correlated electron systems; heavy fermions / 75.20.Hr – Local moment in compounds and alloys; Kondo effect, valence fluctuations, heavy fermions
© EPLA, 2010
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