Series of CaPrCoAs(= 0, 0.10, 0.25, 0.4, 0.6, 0.75, 0.85, 1) single crystals have been synthesized in order to clarify the variation of magnetic order from antiferromagnetic (AFM) in CaCoAsto ferromagnetic (FM) in PrCoAs. It is found that the lattice constant of-axis are contracted with the introduction of Pr into Ca sites in CaCoAs. Electronic transport measurements reveal the metallicity in this system. Systematic magnetic measurements and analysis show that substituting only 10% of Pr for Ca changes the magnetic ground state from A-type AFM ordering of Co magnetic moment in CaCoAsto FM ordering in CaPrCoAs(0.1 ⩽⩽ 1). Most importantly, the abrupt drop of low temperature magnetic susceptibility belowwith⩾ 0.25 and the observed magnetic pole reversal with⩾ 0.4 suggests an AFM coupling between Co 3and Pr 4magnetic sublattice. Finally, a detailed magnetic phase diagram in this system has been obtained.
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