: A prototype half-metallic ferromagnet
Abstract
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.
- Authors:
-
- Ames Lab. and Iowa State Univ., Ames, IA (United States)
- Publication Date:
- Research Org.:
- Ames Laboratory (AMES), Ames, IA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1350055
- Alternate Identifier(s):
- OSTI ID: 1224866
- Report Number(s):
- IS-J-8848
Journal ID: ISSN 1098-0121; PRBMDO; PII: S1090780717300101
- Grant/Contract Number:
- AC02-07CH11358
- Resource Type:
- Journal Article: Accepted Manuscript
- Journal Name:
- Physical Review. B, Condensed Matter and Materials Physics
- Additional Journal Information:
- Journal Volume: 92; Journal Issue: 17; Journal ID: ISSN 1098-0121
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Pandey, Abhishek, and Johnston, D. C. Ba0.4Rb0.6Mn2As2: A prototype half-metallic ferromagnet. United States: N. p., 2015.
Web. doi:10.1103/PhysRevB.92.174401.
Pandey, Abhishek, & Johnston, D. C. Ba0.4Rb0.6Mn2As2: A prototype half-metallic ferromagnet. United States. https://doi.org/10.1103/PhysRevB.92.174401
Pandey, Abhishek, and Johnston, D. C. 2015.
"Ba0.4Rb0.6Mn2As2: A prototype half-metallic ferromagnet". United States. https://doi.org/10.1103/PhysRevB.92.174401. https://www.osti.gov/servlets/purl/1350055.
@article{osti_1350055,
title = {Ba0.4Rb0.6Mn2As2: A prototype half-metallic ferromagnet},
author = {Pandey, Abhishek and Johnston, D. C.},
abstractNote = {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.},
doi = {10.1103/PhysRevB.92.174401},
url = {https://www.osti.gov/biblio/1350055},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
issn = {1098-0121},
number = 17,
volume = 92,
place = {United States},
year = {Mon Nov 02 00:00:00 EST 2015},
month = {Mon Nov 02 00:00:00 EST 2015}
}
Web of Science
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