论文标题
磁性和超导性的相互作用在2D扩展哈伯德模型中
Interplay of magnetism and superconductivity in 2D extended Hubbard model
论文作者
论文摘要
使用扩展的哈伯德模型研究了平方晶格上磁性和超导状态之间的相互作用，该模型考虑了位于最近邻居位点的电子的吸引力。考虑到具有所有可能的螺旋波矢量集的铁，抗磁和螺旋磁状态，以及具有S波和D波配对阶参数的单线超导状态。允许形成具有中间S+ID对称性的状态和不同相之间的相位分离。比较Hartree-Fock和奴隶玻色子近似值的结果，以研究相关效应的作用。在某些模型参数下，超导和磁相的宏观相分离和显微镜共存。
The interplay between magnetic and superconducting states on a square lattice is studied using the extended Hubbard model, which takes into account the attraction of electrons located at nearest neighbor sites. Ferro-, antiferro-, and spiral magnetic states with all possible sets of spiral wave vectors, as well as singlet superconducting states with s-wave and d-wave pairing order parameters, are considered. Formation of a state with the intermediate s+id-symmetry and phase separation between different phases are allowed. The results of the Hartree-Fock and slave boson approximations are compared in order to study the role of correlation effects. Both macroscopic phase separation and microscopic coexistence of the superconducting and magnetic phases are found under certain model parameters.
