Coexisting Kondo singlet state with antiferromagnetic long-range order: A possible ground state for Kondo insulators

Details Coexisting Kondo singlet state with antiferromagnetic long-range order: A possible ground state for Kondo insulators Coexisting Kondo singlet state with antiferromagnetic long-range order: A possible ground state for Kondo insulators

2000-04-25

arxiv.org/abs/cond-mat/0004405v2

Physics

Condensed Matter

Strongly Correlated Electrons

four pages, Revtex, one figure; to be published in Phys. Rev. B, 1 July issue, 2000

Scientific paper

10.1103/PhysRevB.62.76

The ground-state phase diagram of a half-filled anisotropic Kondo lattice model is calculated within a mean-field theory. For small transverse exchange coupling $J_{\perp}J_{\perp c2}$, the long-range order is destroyed and the system is in a disordered Kondo singlet state with a hybridization gap. Both ground states can describe the low-temperature phases of Kondo insulating compounds. Between these two distinct phases, there may be a coexistent regime as a result of the balance between local Kondo screening and magnetic interactions.

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