title: Orbital order and Hund's rule frustration in Kondo lattices.
abstract: We analyze a microscopic origin of the Kondo effect-assisted orbital order in heavy-fermion materials. By studying the periodic two-orbital Anderson model with two local electrons, we show that frustration of Hund's rule coupling due to the Kondo effect leads to an incommensurate spiral orbital and magnetic order, which exists only inside the Kondo screened (heavy-electron) phase. This spiral state can be observed in neutron and resonant x-ray scattering measurements in U- and Pr-based heavy-fermion compounds, and realized in cold atomic gases, e.g., fermionic 173Yb.
authors.affiliation: Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 80703, USA.
authors.forename: L
authors.initials: L
authors.lastname: Isaev
authors.forename: K
authors.initials: K
authors.lastname: Aoyama
authors.forename: I
authors.initials: I
authors.lastname: Paul
authors.forename: I
authors.initials: I
authors.lastname: Vekhter