LaOFeSe, a Mott insulator on the brink of orbital-selective metalization
arXiv:1501.00118 · doi:10.1103/PhysRevB.91.085124
Abstract
LaOFeSe can be explained in terms of Mott localization in sharp contrast with the metallic behavior of FeSe and other parent parent compounds of iron superconductors. We demonstrate that the key ingredient that makes LaOFeSe a Mott insulator, rather than a correlated metal dominated by the Hund's coupling is the enhanced crystal-field splitting, accompanied by a smaller orbital-resolved kinetic energy. The strong deviation from orbital degeneracy introduced by the crystal-field splitting also pushes this materials close to an orbital-selective Mott transition. We predict that either doping or uniaxial external pressure can drive the material into an orbital-selective Mott state, where only one or few orbitals are metallized while the others remain insulating.
submitted to PRB
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Cited by in corpus (4)
- Pressure-induced transition from a Mott insulator to a ferromagnetic Weyl metal in La2O3Fe2Se2
- Revisit of Antiferromagnetism in Hubbard Model by A Cluster Slave-Spin Method
- Hund's metal regimes and orbital selective Mott transitions in three band systems
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