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Magnetization, neutron diffraction, and high-energy x-ray diffraction resultsfor Sn-flux grown single-crystal samples ofCa(Co$_{1-x}$Fe$_{x}$)$_{y}$As$_{2}$, $0\leq x\leq1$, $1.86\leq y \leq 2$, arepresented and reveal that A-type antiferromagnetic order, with ordered momentslying along the $c$ axis, persists for $x\lesssim0.12(1)$. Theantiferromagnetic order is smoothly suppressed with increasing $x$, with boththe ordered moment and N\'{e}el temperature linearly decreasing. Stripe-typeantiferromagnetic order does not occur for $x\leq0.25$, nor does ferromagneticorder for $x$ up to at least $x=0.104$, and a smooth crossover from thecollapsed-tetragonal (cT) phase of CaCo$_{1.86}$As$_{2}$ to the tetragonal (T)phase of CaFe$_{2}$As$_{2}$ occurs. These results suggest that hole dopingCaCo$_{1.86}$As$_{2}$ has a less dramatic effect on the magnetism and structurethan steric effects due to substituting Sr for Ca.

physical review. b./physical review. b

Suppression of magnetic order in CaCo$_{1.86}$As$_{2}$ with Fe  substitution: Magnetization, neutron diffraction, and x-ray diffraction  studies of Ca(Co$_{1-x}$Fe$_{x}$)$_{y}$As$_{2}$