Breaking of fourfold lattice symmetry in a model for pnictide superconductors
Abstract
We investigate the interplay of onsite Coulomb repulsion and various mechanisms breaking the fourfold lattice symmetry in a three-band model for the iron planes of iron-based superconductors. Using cluster-perturbation theory allows us to locally break the symmetry between the x and y directions without imposing long-range magnetic order. Previously investigated anisotropic magnetic couplings are compared to an orbital ordering field and anisotropic hoppings. We find that all three mechanisms for a broken rotational symmetry lead to similar signatures once onsite interactions are strong enough to bring the system close to a spin-density wave. The band distortions near the Fermi level are independent of differences between the total densities found in xz and yz orbitals.
- Publication:
-
Superconductor Science Technology
- Pub Date:
- August 2012
- DOI:
- 10.1088/0953-2048/25/8/084003
- arXiv:
- arXiv:1205.5102
- Bibcode:
- 2012SuScT..25h4003D
- Keywords:
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- Condensed Matter - Superconductivity;
- Condensed Matter - Strongly Correlated Electrons
- E-Print:
- SUST 25, 084003 (2012)