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High critical temperature superconductivity often occurs in systems where anantiferromagnetic order is brought near $T=0K$ by slightly modifying pressureor doping. CaKFe$_4$As$_4$ is a superconducting, stoichiometric iron pnictidecompound showing optimal superconducting critical temperature with $T_c$ aslarge as $38$ K. Doping with Ni induces a decrease in $T_c$ and the onset ofspin-vortex antiferromagnetic order, which consists of spins pointing inwardsto or outwards from alternating As sites on the diagonals of the in-planesquare Fe lattice. Here we study the band structure ofCaK(Fe$_{0.95}$Ni$_{0.05}$)$_4$As$_4$ (T$_c$ = 10 K, T$_N$ = 50 K) usingquasiparticle interference with a Scanning Tunneling Microscope (STM) and showthat the spin-vortex order induces a Fermi surface reconstruction and afourfold superconducting gap anisotropy.

physical review. b./physical review. b

Anisotropic superconductivity and Fermi surface reconstruction in the  spin-vortex antiferromagnetic superconductor  CaK(Fe$_{0.95}$Ni$_{0.05}$)$_4$As$_4$