Ba 1 - x K x Mn 2 As 2 : An Antiferromagnetic Local-Moment Metal
- Ames Laboratory, and Iowa State University, Ames, IA (United States)
- University of Missouri, Columbia, MO (United States)
The compound BaMn{sub 2}As{sub 2} with the tetragonal ThCr{sub 2}Si{sub 2} structure is a local-moment antiferromagnetic insulator with a Néel temperature T{sub N}=625K and a large ordered moment μ=3.9μ{sub 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{sub N} and large μ. Ba{sub 1-x}K{sub x}Mn{sub 2}As{sub 2} is thus the first metallic ThCr{sub 2}Si{sub 2}-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{sub 1-x}K{sub x}Mn{sub 2}As{sub 2} class of compounds also forms a bridge between the layered iron pnictides and cuprates and may be useful to test theories of high T{sub c} superconductivity.
- Research Organization:
- Ames Laboratory (AMES), Ames, IA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC02-07CH11358
- OSTI ID:
- 1044633
- Report Number(s):
- IS-J--7658
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 8 Vol. 108; ISSN 0031-9007
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Similar Records
Crystals, magnetic and electronic properties of a new ThCr{sub 2}Si{sub 2}-type BaMn{sub 2}Bi{sub 2} and K-doped compositions
RKKY coupled local-moment magnetism in