: A prototype half-metallic ferromagnet
- Ames Lab. and Iowa State Univ., Ames, IA (United States)
Half-metallic ferromagnetism (FM) in single-crystal Ba0.39(1)Rb0.61(1)Mn2As2 below its Curie temperature TC = 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 ≤ TC, whereas the data sharply deviate from this model for T > TC. 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 Ba0.6K0.4Mn2As2, these measurements establish 61%-doped Ba0.39Rb0.61Mn2As2 as a prototype for a class of half-metallic ferromagnets in which all the itinerant carriers in the material are ferromagnetic.
- 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
Web of Science
Magnetic hexadecapole order and magnetopiezoelectric metal state in
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journal | August 2017 |
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