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Monday, March 17, 2014
1:00 PM - 2:00 PM
CNLS Conference Room (TA-3, Bldg 1690)

Seminar

Orbital order and Hund's rule frustration in Kondo lattice

Leonid Isaev
Department of Physics and Astronomy, Louisiana State University

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 Yb-173.