An effective mean field theory for the coexistence of anti-ferromagnetism and superconductivity: Applications to iron-based superconductors and cold Bose-Fermi atomic mixtures
| Autor: | Brackett, Jeremy, Newman, Joseph, De Silva, Theja N. |
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| Rok vydání: | 2016 |
| Předmět: | |
| Zdroj: | Physics Letters A 380, 3421 (2016) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1016/j.physleta.2016.08.013 |
| Popis: | We study an effective fermion model on a square lattice to investigate the cooperation and competition of superconductivity and anti-ferromagnetism. In addition to particle tunneling and on-site interaction, a bosonic excitation mediated attractive interaction is also included in the model. We assume that the attractive interaction is mediated by spin fluctuations and excitations of Bose-Einstein condensation (BEC) in electronic systems and Bose-Fermi mixtures on optical lattices, respectively. Using an effective mean-field theory to treat both superconductivity and anti-ferromagnetism at equal footing, we study the model within the Landau energy functional approach and a linearized theory. Within our approaches, we find possible co-existence of superconductivity and anti-ferromagnetism for both electronic and cold-atomic models. Our linearized theory shows while spin fluctuations favor d-wave superconductivity and BEC excitations favor s-wave superconductivity. Comment: Published version (Physics Letters A) |
| Databáze: | arXiv |
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