Itinerant ferromagnetism in the As 4p conduction band of Ba0.6K0.4Mn2As2 identified by x-ray magnetic circular dichroism

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.

doi:10.1103/PhysRevLett.114.217001

Title: Itinerant ferromagnetism in the As 4p conduction band of Ba_0.6K_0.4Mn₂As₂ identified by x-ray magnetic circular dichroism

Journal Article · Wed May 27 00:00:00 EDT 2015 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.114.217001· OSTI ID:1227312

Ueland, B. G. ^[1]; Pandey, Abhishek ^[1]; Lee, Y. ^[1]; Sapkota, A. ^[1]; Choi, Y. ^[2]; Haskel, D. ^[2]; Rosenberg, R. A. ^[2]; Lang, J. C. ^[2]; Harmon, B. N. ^[1]; Johnston, D. C. ^[1]; Kreyssig, A. ^[1]; Goldman, A. I. ^[1]

Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)

In this study, x-ray magnetic circular dichroism (XMCD) measurements on single-crystal and powder samples of Ba_0.6K_0.4Mn₂As₂ show that the ferromagnetism below T_C ≈ 100 K arises in the As 4p conduction band. No XMCD signal is observed at the Mn x-ray absorption edges. Below T_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 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.

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Research Organization:: Ames Lab., Ames, IA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-07CH11358; AC02-06CH11357

OSTI ID:: 1227312

Alternate ID(s):: OSTI ID: 1183229

Report Number(s):: IS-J-8698; PRLTAO

Journal Information:: Physical Review Letters, Vol. 114, Issue 21; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 25 works

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Title: Itinerant ferromagnetism in the As 4p conduction band of Ba_0.6K_0.4Mn₂As₂ identified by x-ray magnetic circular dichroism