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Exotic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>d</mml:mi></mml:math>-Wave Superconducting State of Strongly Hole-Doped<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi mathvariant="bold">K</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi>Ba</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>Fe</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi…
We investigate the superconducting phase in the ${\mathrm{K}}_{x}{\mathrm{Ba}}_{1\ensuremath{-}x}{\mathrm{Fe}}_{2}{\mathrm{As}}_{2}$ 122 compounds from moderate to strong hole-doping regimes. Using the functional renormalization group, we show that, while the system develops a nodeless anisotropic ${s}^{\ifmmode\pm\else\textpm\fi{}}$ order parameter in the moderately doped regime, gapping out the electron pockets at strong hole doping drives the …