Volume 113, Number 6, March 2016
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||18 April 2016|
Relationship between pairing symmetries and interaction parameters in iron-based superconductors from functional renormalization group calculations
1 Institute of Physics, Chinese Academy of Sciences - Beijing 100190, China
2 Department of Physics, Purdue University - West Lafayette, IN 47907, USA
3 Collaborative Innovation Center of Quantum Matter - Beijing, China
Received: 14 January 2016
Accepted: 7 April 2016
Pairing symmetries of iron-based superconductors are investigated systematically in a five-orbital model within the different regions of interaction parameters by functional renormalization group (FRG). Even for a fixed Fermi surface with both hole and electron pockets, it is found that depending on interaction parameters, a variety of pairing symmetries, including two types of d-wave and two types of s-wave pairing symmetries, can emerge. Only the - and the s±-waves are robustly supported by the nearest-neighbor (NN) intra-orbital J1 and the next-nearest-neighbor (NNN) intra-orbital J2 antiferromagnetic (AFM) exchange couplings, respectively. This study suggests that the accurate initial input of the interaction parameters is essential to make FRG a useful method to determine the leading channel of superconducting instability.
PACS: 74.20.Rp – Pairing symmetries (other than s-wave) / 74.25.Dw – Superconductivity phase diagrams / 74.20.-z – Theories and models of superconducting state
© EPLA, 2016
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