Exotic d-Wave Superconducting State of Strongly Hole-Doped KxBa1−xFe2As2
Ronny Thomale, Christian Platt, Werner Hanke, Jiangping Hu, B. Andrei Bernevig
DOI 10.1103/PhysRevLett.107.117001 · Physical Review Letters
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Abstract
We investigate the superconducting phase in the KxBa1−xFe2As2 122 compounds from moderate to strong hole-doping regimes. Using the 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 (coskx+cosky)(coskx−cosky) d-wave superconducting state. This is in accordance with recent experimental evidence from measurements on KFe2As2 which observe a nodal order parameter in the extreme doping regime. The magnetic instability is strongly suppressed.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| KxBa1-xFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 37 | Pressure not reported | unknown |
| KFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3 | Pressure not reported | unknown |
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