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The inference of Ying et al. [EPL 104, 67005 (2013)] of a composition-inducedchange from c-axis ordered-moment alignment in a collinear A-typeantiferromagnetic (AFM) structure (AFMI) at small x to ab-plane alignment in anunknown AFM structure (AFMII) at larger x in Ca(1-x)Sr(x)Co(2-y)As(2) with thebody-centered tetragonal ThCr2Si2 structure is confirmed. Our major finding isan anomalous magnetic behavior in the crossover region 0.2 < x < 0.3 betweenthese two phases. In this region the magnetic susceptibility versus temperaturechi_ab(T) measured with magnetic fields H applied in the ab plane exhibittypical AFM behaviors with cusps at the Neel temperatures of about 65 K,whereas chi_c(T) and the low-temperature isothermal magnetization M_c(H) with Haligned along the c axis exhibit extremely soft ferromagnetic-like behaviors.

Anomalous Composition-Induced Crossover in the Magnetic Properties of the Itinerant-Electron Antiferromagnet Ca{1-x}Sr{x}Co{2-y}As{2}