Mott transition and heavy fermion state in the pyrochlore Hubbard model

Details Mott transition and heavy fermion state in the pyrochlore Hubbard model Mott transition and heavy fermion state in the pyrochlore Hubbard model

2001-03-21

arxiv.org/abs/cond-mat/0103430v2

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 5 figures, revised version accepted for the publication in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.64.085102

We investigate the interplay between geometrical frustration and strong electron correlation based upon the pyrochlore Hubbard model. In the half-filling case, using the perturbative expansion in terms of electron correlation, we show that the self-energy shows a divergent behavior leading the system into the Mott insulating state, in which quantum disordered spin liquid without magnetic long-range order realizes. In the hole-doped case, we obtain heavy-fermion-like Fermi liquid state. We also calculate the neutron cross section which is well consistent with recent neutron scattering experiments for itinerant pyrochlore systems.

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