A Microscopic Model of the FeAs Plane in the Iron-Based Superconductors: Orbital Degeneracy, Geometric Frustration and Structural Transition
A Microscopic Model of the FeAs Plane in the Iron-Based Superconductors: Orbital Degeneracy, Geometric Frustration and Structural Transition
复制标题
铁基超导体中 FeAs 平面的微观模型：轨道简并性、几何挫败和结构转变
DOI：
10.1143/jpsjs.77sc.103
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
李涛
中科院分区：
文献类型：
--
作者：
李涛
We construct a two-band model for the FeAs plane in the newly discovered iron-based superconductors based on quantum chemistry consideration and the magnetic correlation pattern observed by neutron scattering. The orbital degeneracy between the Fe 3 d x z and 3 d y z orbital and their covalence with the As 4p orbitals play a key role in the model. The model explains naturally the large geometric frustration which is needed for the formation of the magnetic order with a wave vector at (π,0) and provides a natural understanding of the tetragonal–orthorhombic structural phase transition as a kinetic-energy-driven Jahn–Teller effect. An extended s-wave pairing is proposed for the superconducting state based on symmetry consideration.
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