Insulator-to-metal phase transition in Yb-based Kondo insulators

Details Insulator-to-metal phase transition in Yb-based Kondo insulators Insulator-to-metal phase transition in Yb-based Kondo insulators

2010-04-22

arxiv.org/abs/1004.3834v1

European Physical Letters 91, 57002 (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 3 figures

Scientific paper

The periodic Anderson lattice model for the crystalline electric field (CEF)split 4f quartet states is used to describe the Yb-based Kondo insulators/semiconductors. In the slave-boson mean-field approximation, we derive the hybridized quasiparticle bands, and find that decreasing the hybridization difference of the two CEF quartets may induce an insulator-to-metal phase transition. The resulting metallic phase has a hole and an electron Fermi pockets. Such a phase transition may be realized experimentally by applying pressure, reducing the difference in hybridization of the two CEF quartets.

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