摘要
A single band t-U-J1-J2 model is proposed as the minimum model to describe the superconductivity of the newly discovered iron-based superconductors R（O1-xFx）FeAs and RO1-xFeAs （R=La, Ce, Sm, Pr, Nd, Gd）. With the mean-field approach, it is found that the pairing occurs in the d-wave channel. In the likely parameter region of the real materials, by lowering temperature, the system enters firstly the dxy superconducting phase with D4h-symmetry and then enters the time-reversal-symmetry-broken dxy＋idx2-y2 superconducting phase with C4h -symmetry.
A single band t-U-J1-J2 model is proposed as the minimum model to describe the superconductivity of the newly discovered iron-based superconductors R（O1-xFx）FeAs and RO1-xFeAs （R=La, Ce, Sm, Pr, Nd, Gd）. With the mean-field approach, it is found that the pairing occurs in the d-wave channel. In the likely parameter region of the real materials, by lowering temperature, the system enters firstly the dxy superconducting phase with D4h-symmetry and then enters the time-reversal-symmetry-broken dxy＋idx2-y2 superconducting phase with C4h -symmetry.
基金
Supported by the National Natural Science Foundation of China, the Knowledge Innovation Project of Chinese Academy of Sciences, and the National Basic Research Programme of China.
