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Exotic d-wave superconductivity in strongly hole doped K(x)Ba(1-x)Fe2As2

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arxiv 1101.3593 v2 pith:QI2BDCUK submitted 2011-01-19 cond-mat.supr-con

Exotic d-wave superconductivity in strongly hole doped K(x)Ba(1-x)Fe2As2

Ronny Thomale , Christian Platt , Werner Hanke , Jiangping Hu , B. Andrei Bernevig This is my paper
classification cond-mat.supr-con
keywords holepocketscased-wavedopeddopingelectronfe2as2
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We investigate the superconducting phase in the K(x)Ba(1-x)Fe2As2 122 compounds from moderate to strong hole-doping regimes. Using functional renormalization group, we show that while the system develops a nodeless anisotropic s+- order parameter in the moderately doped regime, gapping out the electron pockets at strong hole doping drives the system into a nodal cos (kx) cos (ky) d-wave superconducting state. This is in agreement with recent experimental evidence from measurements on KFe2As2 which see a nodal order parameter in the extreme doping regime. The magnetic instability is strongly suppressed. The case of only hole pockets present is argued to be structurally similar to the case of only electron pockets present as indicated for KxFe2Se2.

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