title: Ba(1-x)K(x)Mn2As2: an antiferromagnetic local-moment metal.
abstract: The compound BaMn2As2 with the tetragonal ThCr2Si2 structure is a local-moment antiferromagnetic insulator with a Néel temperature T(N)=625 K and a large ordered moment μ=3.9μ(B)/Mn. We demonstrate that this compound can be driven metallic by partial substitution of Ba by K while retaining the same crystal and antiferromagnetic structures together with nearly the same high T(N) and large μ. Ba(1-x)K(x)Mn2As2 is thus the first metallic ThCr2Si2-type MAs-based system containing local 3d transition metal M magnetic moments, with consequences for the ongoing debate about the local-moment versus itinerant pictures of the FeAs-based superconductors and parent compounds. The Ba(1-x)K(x)Mn2As2 class of compounds also forms a bridge between the layered iron pnictides and cuprates and may be useful to test theories of high T(c) superconductivity.
authors.affiliation: Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA. apandey@amelab.gov
authors.forename: Abhishek
authors.initials: A
authors.lastname: Pandey
authors.forename: R S
authors.initials: RS
authors.lastname: Dhaka
authors.forename: J
authors.initials: J
authors.lastname: Lamsal
authors.forename: Y
authors.initials: Y
authors.lastname: Lee
authors.forename: V K
authors.initials: VK
authors.lastname: Anand
authors.forename: A
authors.initials: A
authors.lastname: Kreyssig
authors.forename: T W
authors.initials: TW
authors.lastname: Heitmann
authors.forename: R J
authors.initials: RJ
authors.lastname: McQueeney
authors.forename: A I
authors.initials: AI
authors.lastname: Goldman
authors.forename: B N
authors.initials: BN
authors.lastname: Harmon
authors.forename: A
authors.initials: A
authors.lastname: Kaminski
authors.forename: D C
authors.initials: DC
authors.lastname: Johnston