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Hundness and nematicity in iron iron pnictides

AuthorsValenzuela, Belén ; Fanfarillo, Laura; Cortijo, Alberto
Issue Date2014
Citation27th International Conference on Low Temperatures Physics (2014)
AbstractThere are two exciting research scenarios in iron pnictides, nematicity and Hundness believed to be key to understand superconductivity in these compounds. In the nematic state the rotational symmetry of the ionic lattice is broken and experiments seem to indicate that the nematic state is driven by electronic degrees of freedom as evidenced by charge, spin, and orbital probes. On the other hand, Hund’s coupling has been proposed as the origin of columnar magnetic ordering and as the responsible for the bad metallic behavior and the orbital differentiation in the normal state with some of the orbitals more correlated than others. In this work we derive an effective Landau model from a microscopic Hamiltonian via a Hubbard-Stratonovich transformation. We extend previous derivations to address the dependence of the Landau coefficients on the Hund’s coupling, Hubbard’s coupling and on the orbital content. We find that Hund’s coupling reduces the critical magnetic temperature which agrees with the small Neel temperature found in iron superconductors. Hund’s coupling also favors columnar ordering magnetism in agreement with other theoretical techniques. We discuss the interplay between magnetism and orbital degrees of freedom in the nematic state in view of this effective model.
DescriptionPoster presented at the 27th International Conference on Low Temperatures Physics that took place in Buenos Aires (Argentina) on 6-13th August 2014.
Appears in Collections:(ICMM) Comunicaciones congresos
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