The Minimum Model for the Iron-Based Superconductors

Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190

Received Date: April 29, 2008

Published Date: May 31, 2008

Abstract

A single band t-U-J₁-J₂model is proposed as the minimum model to describe the superconductivity of the newly discovered iron-based superconductors
R(O_1-xF_x)FeAs and RO_1-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 d_xy superconducting phase with D_4h-symmetry
and then enters the time-reversal-symmetry-broken d_^xy+id_x²-y² superconducting phase with C_4h-symmetry.

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