2012/01/31 by Jin‐Ke Bao, Jin-Ke Bao, Hao Jiang +17
Materials Science · Physics and Astronomy · #Iron-based superconductors research #Physics of Superconductivity and Magnetism #Rare-earth and actinide compounds #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.85.144523
published as Physical Review B 85, 144523 (2012) · Some data were re-arranged and/or added, 8 figures
openalex publication_date 2012/04/25 · arxiv created 2012/05/07 · arxiv updated 2012/05/08 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Heavily doped Ba_1\ensuremath-xKxMn2As2 (x=0.19 and 0.26) single crystals were successfully grown and investigated by the measurements of resistivity and anisotropic magnetization. In contrast to the antiferromagnetic insulating ground state of the undoped BaMn2As2, the K-doped crystals show metallic conduction with weak ferromagnetism below \ensuremath∼50 K and Curie--Weiss-like in-plane magnetic susceptibility above \ensuremath∼50 K. Under high pressures up to 6 G Pa, the low-temperature metallicity changes into a state characterized by a Kondo-like resistivity minimum. Electronic structure calculations for x=0.25 using a 2\ifmmode×\else\texttimes\fi2\ifmmode×\else\texttimes\fi1 supercell reproduce the hole-doped metallic state. The density of states at Fermi energy has significant As-4p components, indicating that the 4p holes are mainly responsible for the metallic conduction. Our results suggest that the interplay between the itinerant 4p holes and the local 3d moments is mostly responsible for the novel metallic state.