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Electronic Correlations and Magnetic Frustration in the Iron Pnictides

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If you have a question about this talk, please contact Dr Jonathan Keeling.

Since the surprising discovery of high temperature superconductivity in the iron pnictides in 2008, a large body of physical properties have already been accumulated. These properties provide the basis for considerations on the microscopic physics of these copper-free systems.

Based on the fact that they are “bad metals”, I will make the case that these systems are at the boundary between itinerancy and interaction-induced localization; in other words, they are metals close to a Mott transition. I will show how such a picture naturally leads to magnetic frustration in the form of J1-J2 superexchange interactions on the iron square lattice. Finally, I will describe the implications of the resulting microscopic model for the existing experiments on magnetic structure and dynamics, for prospective magnetic quantum criticality, and for superconductivity.

This talk is part of the Irregular seminars in TCM series.

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