Itinerant ferromagnetism in the As 4$p$ conduction band of Ba${}_{0.6}$K${}_{0.4}$Mn${}_2$As${}_2$ identified by x-ray magnetic circular dichroism

Abstract

X-ray magnetic circular dichroism (XMCD) measurements on single-crystal and powder samples of Ba${}_{0.6}$K${}_{0.4}$Mn${}_2$As${}_2$ show that the ferromagnetism below $T_{\text{C}}\approx$ 100 K arises in the As $4p$ conduction band. No XMCD signal is observed at the Mn x-ray absorption edges. Below $T_{\text{C}}$, however, a clear XMCD signal is found at the As $K$ edge which increases with decreasing temperature. The XMCD signal is absent in data taken with the beam directed parallel to the crystallographic $\text{c}$ axis indicating that the orbital magnetic moment lies in the basal plane of the tetragonal lattice. These results show that the previously reported itinerant ferromagnetism is associated with the As $4p$ conduction band and that distinct local-moment antiferromagnetism and itinerant ferromagnetism with perpendicular easy axes coexist in this compound at low temperature.

arXiv comment6 pages; Supplemental Material Included; The text in version 2 is slightly different from the text in version 1

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