Superconductivity from repulsive electronic correlations on alternant cuprate and iron-based lattices

作者：Dunne Lawrence J^*; Brandas Erkki J

来源：International Journal of Quantum Chemistry, 2013, 113(17): 2053-2059.

DOI：10.1002/qua.24437

• high Tc superconductivity
• off-diagonal long-range order
• cuprates
• pnictides
• Coulomb repulsion

A key question in the theory of high-temperature superconductivity is whether off-diagonal long-range order can be induced wholly or in large part by repulsive electronic correlations. Electron pairs on cuprate and the iron-based pnictide and chalcogenide alternant lattices may interact with a strong short-range Coulomb repulsion and much weaker longer range attractive tail. Here, we show that such interacting electrons can cooperate to produce a superconducting state in which time-reversed electron pairs effectively avoid the repulsive part but reside predominantly in the attractive region of the potential. The alternant lattice structure is a key feature of such a stabilization mechanism leading to the occurrence of high-temperature superconductivity with d(x2-y2) or sign alternating s-wave or s +/- condensate symmetries.

• 出版日期2013-9-5