The minimum model for the iron-based superconductors

Details The minimum model for the iron-based superconductors The minimum model for the iron-based superconductors

2008-05-06

arxiv.org/abs/0805.0644v1

Chin. Phys. Lett. 25, No.6(2008)2232

Physics

Condensed Matter

Superconductivity

3 pages, 3 figures

Scientific paper

A single band $t$-$U$-$J_1$-$J_2$ model is proposed as the minimum model to describe the superconductivity of the newly discovered iron-based superconductors $R(O_{1-x}F_x)FeAs$ and $RO_{1-x}FeAs$ ($R=La, Ce, Sm, Pr, Nd,Gd$). 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 $d_{xy}$ superconducting phase with $D_{4h}$-symmetry and then enters the time-reversal-symmetry-broken $d_{xy}+id_{x^2-y^2}$ superconducting phase with $C_{4h}$-symmetry.

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