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BaMn2As2 is a local-moment antiferromagnetic insulator with a N\'eeltemperature of 625 K and a large ordered moment of 3.9 Bohr magneton per Mn.Remarkably, this compound can be driven metallic by the substitution of aslittle as 1.6% K for Ba while retaining essentially the same ordered magneticmoment and N\'eel temperature, as previously reported. Here, using both powderand single crystal neutron diffraction we show that the local momentantiferromagnetic order in Ba(1-x)KxMn2As2 remains robust up to x = 0.4. Theordered moment is nearly independent of x for 0 < x < 0.4 and the N\'eeltransition temperature decreases to 480 K at x = 0.4.

Persistence of local-moment antiferromagnetic order in Ba(1-x)KxMn2As2