1.Department
of Physics and Center of Theoretical and Computational Physics, The
University of Hong Kong, Hong Kong, China; 2.Institut
fur Physik, ETH-Züurich, 8093 züurich, Switzerland；Department
of Physics and Center of Theoretical and Computational Physics, The
University of Hong Kong, Hong Kong, China; 3.Department
of Physics, Chinese University of Hong Kong, Hong Kong, China; 4.Department
of Physics and Center of Theoretical and Computational Physics, The
University of Hong Kong, Hong Kong, China；Department
of Physics, Zhejiang University, Hangzhou 310027, China; 5.2009-11-03 23:29:39;
Abstract： Superconductivity in iron pnictides is studied by using a two-orbital Hubbard model in the large U limit. The Coulomb repulsion induces an orbital-dependent pairing between charge carriers. The pairing is found mainly from the scattering within the same Fermi pocket where usually one single orbital dominates. The inter-pocket pair scatterings determine the symmetry of the singlet superconductivity, which is an extended s-wave at small Hund’s coupling, and d-wave at large Hund’s coupling and large U. The former is consistent with recent experiments of ARPES and Andreev reflection spectroscopy. Spin triplet states only become important at large exchange interaction J.
. Theory for superconductivity in iron pnictides
at large coulomb U limit[J]. Front. Phys. , 2009, 4(4): 447-454.
Wei-qiang CHEN（陈伟强）, Kai-yu YANG（杨开宇）, Yi ZHOU（周毅）, Fu-chun ZHANG（张富春）. Theory for superconductivity in iron pnictides
at large coulomb U limit. Front. Phys. , 2009, 4(4): 447-454.
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