Volume 93, Number 5, March 2011
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||24 February 2011|
The electron pairing of KxFe2−ySe2
Department of Physics, Massachusetts Institute of Technology - Cambridge, MA 02139, USA
2 Department of Physics, Beijing Institute of Technology - Beijing 100081, China
3 Department of Physics, Renmin University of China - Beijing 100872, China
4 Institute of Theoretical Physics, Chinese Academy of Sciences - Beijing 100190, China
5 Institute of Physics, Chinese Academy of Sciences - Beijing 100190, China
6 Department of Physics, University of California at Berkeley - Berkeley, CA 94720, USA
7 Materials Sciences Division, Lawrence Berkeley National Laboratory - Berkeley, CA 94720, USA
Accepted: 9 February 2011
We studied the pairing instabilities in KxFe2−ySe2 using a two-stage functional renormalization group (FRG) method. Our results suggest the leading and subleading pairing symmetries are nodeless dx2−y2 and nodal extended s, respectively. In addition, despite having no Fermi surfaces we find the buried hole bands make important contributions to the final effective interaction. From the bandstructure, spin susceptibility and the FRG results we conclude that the low-energy effective interaction in KxFe2−ySe2 is well described by a J1-J2 model with dominant nearest-neighbor antiferromagnetic interaction J1 (at least as far as the superconducting pairing is concerned). In the end we briefly mention several obvious experiments to test whether the pairing symmetry is indeed dx2−y2.
PACS: 74.20.Rp – Pairing symmetries (other than s-wave) / 74.20.Mn – Nonconventional mechanisms
© EPLA, 2011
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