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The Minimum Model for the Iron-Based Superconductors |
| LI Jian;WANG Yu-Peng |
| Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190 |
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| Cite this article: |
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LI Jian, WANG Yu-Peng 2008 Chin. Phys. Lett. 25 2232-2234 |
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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 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.
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| Keywords:
74.70.-b
71.18.+y
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Received: 30 April 2008
Published: 31 May 2008
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| PACS: |
74.70.-b
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(Superconducting materials other than cuprates)
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71.18.+y
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(Fermi surface: calculations and measurements; effective mass, g factor)
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