Itinerant Ferromagnetism in the As 4p Conduction Band of Ba0.6K0.4Mn2As2 Identified by X-Ray Magnetic Circular Dichroism

X-ray magnetic circular dichroism (XMCD) measurements on single-crystal and powder samples of Ba0.6K0.4Mn2As2 show that the ferromagnetism below TC[approximate]100 K arises in the As 4p conduction band. No XMCD signal is observed at the Mn x-ray absorption edges. Below TC, however, a clear XMCD sign...

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Bibliographic Details
Published in:Physical review letters 2015-05, Vol.114 (21)
Main Authors: Ueland, B G, Pandey, Abhishek, Lee, Y, Sapkota, A, Choi, Y, Haskel, D, Rosenberg, R A, Lang, J C, Harmon, B N, Johnston, D C, Kreyssig, A, Goldman, A I
Format: Article
Language:English
Subjects:
Antiferromagnetism
Circularity
Conduction band
Dichroism
Ferromagnetism
Manganese
MATERIALS SCIENCE
Tetragonal lattice
X-rays
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Summary:X-ray magnetic circular dichroism (XMCD) measurements on single-crystal and powder samples of Ba0.6K0.4Mn2As2 show that the ferromagnetism below TC[approximate]100 K arises in the As 4p conduction band. No XMCD signal is observed at the Mn x-ray absorption edges. Below TC, 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 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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.114.217001