Ba0.4Rb0.6Mn2As2: A prototype half-metallic ferromagnet

Pandey, Abhishek; Johnston, D. C.

doi:10.1103/PhysRevB.92.174401

Title: ${Ba}_{0.4} {Rb}_{0.6} {Mn}_{2} {As}_{2}$ : A prototype half-metallic ferromagnet

Journal Article · Mon Nov 02 00:00:00 EST 2015 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.92.174401· OSTI ID:1350055

Pandey, Abhishek ^[1]; Johnston, D. C. ^[1]

Ames Lab. and Iowa State Univ., Ames, IA (United States)

Half-metallic ferromagnetism (FM) in single-crystal Ba_0.39(1)Rb_0.61(1)Mn₂As₂ below its Curie temperature T_C = 103(2) K is reported. The magnetization M versus applied magnetic field H isotherm data at 1.8 K show complete polarization of the itinerant doped-hole magnetic moments that are introduced by substituting Rb for Ba. Here, the material exhibits extremely soft FM, with unobservably small remanent magnetization and coercive field. Surprisingly, and contrary to typical itinerant FMs, the M(H) data follow the Arrott-plot paradigm that is based on a mean-field theory of local-moment FMs. The in-plane electrical resistivity data are fitted well by an activated-T² expression for T ≤ T_C, whereas the data sharply deviate from this model for T > T_C. Hence the activated-T² resistivity model is an excellent diagnostic for determining the onset of half-metallic FM in this compound, which in turn demonstrates the presence of a strong correlation between the electronic transport and magnetic properties of the material. Together with previous data on 40% hole-doped Ba_0.6K_0.4Mn₂As₂, these measurements establish 61%-doped Ba_0.39Rb_0.61Mn₂As₂ as a prototype for a class of half-metallic ferromagnets in which all the itinerant carriers in the material are ferromagnetic.

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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:: 1350055

Alternate ID(s):: OSTI ID: 1224866

Report Number(s):: IS-J-8848; PRBMDO; PII: S1090780717300101

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Vol. 92, Issue 17; ISSN 1098-0121

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 9 works

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