Ba1-xKxMn2As2: An Antiferromagnetic Local-Moment Metal

TitleBa1-xKxMn2As2: An Antiferromagnetic Local-Moment Metal
Publication TypeJournal Article
Year of Publication2012
AuthorsPandey A, Dhaka RS, Lamsal J, Lee Y, Anand VK, Kreyssig A, Heitmann TW, McQueeney RJ, Goldman AI, Harmon BN, Kaminski A, Johnston DC
Journal TitlePhysical Review Letters
Date Published02
Type of ArticleArticle
ISBN Number0031-9007
Accession NumberWOS:000300669600031

The compound BaMn2As2 with the tetragonal ThCr2Si2 structure is a local-moment antiferromagnetic insulator with a Neel temperature T-N = 625 K and a large ordered moment mu = 3.9 mu(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 mu. Ba1-xKxMn2As2 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 Ba1-xKxMn2As2 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.

URL<Go to ISI>://WOS:000300669600031
Alternate JournalPhys. Rev. Lett.