The Minimum Model for the Iron-Based Superconductors |
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| Authors: | LI Jian WANG Yu-Peng |
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| Affiliation: | Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190 |
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| Abstract: | A single band t-U-J1-J2 model is proposed as the minimum model to describe the superconductivity of the newly discovered iron-based superconductorsR(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-symmetryand then enters the time-reversal-symmetry-broken dxy+idx2-y2 superconducting phase with C4h-symmetry. |
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| Keywords: | 74 70 -b 71 18 +y |
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