Ferrimagnetism and half-metallicity in Cr-substituted Mn<sub>4–<i>x</i> </sub>Cr<i> <sub>x</sub> </i>Al<sub>11</sub>
Single crystals of disordered Mn<sub>4-<i>x</i></sub>Cr<i><sub>x</sub></i>Al<sub>11</sub>have been synthesized via the flux method. EDS on several crystals of various sizes and shapes revealed an average molar ratio of 17:9:74 for Mn:Cr:Al, while x-ray diffraction on three different crystals yield compositions Mn<sub>2.26</sub>Cr<sub>1.74</sub>Al<sub>11</sub>(Mn<sub>4-<i>x</i></sub>Cr<i><sub>x</sub></i>Al<sub>11</sub>,<i>x</i>= 1.74), Mn<sub>0.83</sub>Cr<sub>3.17</sub>Al<sub>11</sub>, and Mn<sub>1.07</sub>Cr<sub>2.93</sub>Al<sub>11</sub>. This compound crystallizes in space groupP1¯, isostructural with both Mn<sub>4</sub>Al<sub>11</sub>and Cr<sub>4</sub>Al<sub>11</sub>. Magnetic measurements on several crystals show that this disordered compound is ferrimagnetic with a low effective moment ofμeff≈1.012±0.004μB/f.u.and a non-reachable transition temperature. Density functional theory calculations display opening of a bandgap in the spin-up channel near the Fermi level with increasing Cr content, an indication of half-metallicity.
Authors
- Tiglet Besara (ORCID: https://orcid.org/0000-0002-2143-2254)
- Adam J. Hauser (ORCID: https://orcid.org/0000-0003-1752-0937)
- Ka Ming Law (ORCID: https://orcid.org/0000-0001-6392-2262)
- Md Fahel Bin Noor (ORCID: https://orcid.org/0009-0005-2960-5622)
- Nusrat Yasmin
Institutions
- Missouri State University (US)
- University of Alabama (US)
Publication Details
- Journal
- Journal of Physics Condensed Matter
- Published
- 2025-05-14
- DOI
- https://doi.org/10.1088/1361-648x/add8d8
- Citations
- 1
- Primary Topic
- Magnetic Properties of Alloys
- Type
- article
- Field-Weighted Citation Impact
- 0.43
Funders
- National Science Foundation