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Orbital order and Hunds rule frustration in Kondo lattices
April 24, 20154:00 pm – 5:00 pm (CDT)

Orbital order and Hunds rule frustration in Kondo lattices


Ilya Vekhter (Louisiana State University)


Ar. Abanov



Mitchell Institute for Fundamental Physics & Astronomy

College Station, Texas 77843

Event Details

Origin of exotic orders in correlated systems have been a long-standing focus of research. It is generally believed that Kondo screening that gives rise to the heavy fermion state competes with both magnetic and orbital order. In this talk I will give an example of an opposite trend. I will analyze microscopic origin of the Kondo effect-assisted orbital order in heavy-fermion materials. I will show that, for periodic two-orbital Anderson model with two local electrons, frustration of local Hunds rule coupling due to Kondo screening leads to an incommensurate spiral orbital and magnetic order, which exists only inside the Kondo (heavy-electron) phase. This spiral state can in principle be observed in measurements in U and Pr-based heavy-fermion compounds, and realized in cold atomic gases, e.g. fermionic 173Yb. I will discuss the implications of this result for the phase diagram of such systems.

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