Pairing strength and symmetries of (K,Tl)FexSe2 in comparison with iron pnictides

Details Pairing strength and symmetries of (K,Tl)FexSe2 in comparison with iron pnictides Pairing strength and symmetries of (K,Tl)FexSe2 in comparison with iron pnictides

2011-03-16

arxiv.org/abs/1103.3259v1

Physics

Condensed Matter

Superconductivity

10 pages, 11 figures

Scientific paper

We address singlet pairing states in the newly discovered superconducting iron selenides (K,Tl)FexSe2 within an incipient Mott approach. We analyze a five orbital t-J1-J2 model, and contrast the results with those of a related model for the iron pnictides. Similar to the pnictides case, an A1g s_{x^2y^2} state and a B1g d_{x^2-y^2} state are quasi-degenerate in the J1 ~ J2 magnetic frustration regime. In contrast to the pnictides case, an A1g s_{x^2+y^2} state is not competitive in the relevant parameter regime. The dominant pairing channels are fully gapped. The pairing amplitudes are of the same order as their pnictides counterparts, making it natural that the maximum T_c is comparable in the two systems.

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