Pairing Symmetry in a Two-Orbital Exchange Coupling Model of Oxypnictides

Details Pairing Symmetry in a Two-Orbital Exchange Coupling Model of Oxypnictides Pairing Symmetry in a Two-Orbital Exchange Coupling Model of Oxypnictides

2008-05-19

arxiv.org/abs/0805.2958v2

Physical Review Letters 101, 206404 (2008)

Physics

Condensed Matter

Superconductivity

4 pages

Scientific paper

10.1103/PhysRevLett.101.206404

We study the pairing symmetry of a two orbital $J_1-J_2$ model for FeAs layers in oxypnictides. We vary the doping and the value of $J_1$ and $J_2$ to compare all possible pairing symmetries in a mean-field calculation. We show that the mixture of an intra-orbital unconventional $s_{x^2y^2}\sim \cos(k_x)\cos(k_y)$ pairing symmetry and a $d_{x^2-y^2}\sim \cos(k_x)-\cos(k_y)$ pairing symmetry is favored in a large part of $J_1-J_2$ phase diagram. A pure $ s_{x^2y^2}$ pairing state is favored for $J_2>>J_1$. The signs of the $d_{x^2-y^2}$ order parameters in two different orbitals are opposite. While a small $d_{xy}\sim \sin(k_x)\sin(k_y)$ inter-orbital pairing order coexists in the above phases, the intra-orbital $d_{xy}$ pairing symmetry is not favored even for large values of $J_2$.

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