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Antiferromagnetic CuMnAs: Ab initio description of finite temperature magnetism and resistivity
- Source :
- Journal of Magnetism and Magnetic Materials. ISSN 0304-8853, vol. 513, p. 167078 (2020)
- Publication Year :
- 2019
-
Abstract
- Noncollinear magnetic moments in antiferromagnets (AFM) lead to a complex behavior of electrical transport, even to a decreasing resistivity due to an increasing temperature. Proper treatment of such phenomena is required for understanding AFM systems at finite temperatures; however first-principles description of these effects is complicated. With ab initio techniques, we investigate three models of spin fluctuations (magnons) influencing the transport in AFM CuMnAs; the models are numerically feasible and easily implementable to other studies. We numerically justified a fully relativistic collinear disordered local moment approach and we present its uncompensated generalization. A saturation or a decrease of resistivity caused by magnons, phonons, and their combination (above approx. 400 K) was observed and explained by changes in electronic structure. Within the coherent potential approximation, our finite-temperature approaches may be applied also to systems with impurities, which are found to have a large impact not only on residual resistivity, but also on canting of magnetic moments from the AFM to the ferromagnetic (FM) state.<br />Comment: 25 pages, 8 figures, 2 tables; accepted version to JMMM
- Subjects :
- Condensed Matter - Materials Science
Physics - Computational Physics
Subjects
Details
- Database :
- arXiv
- Journal :
- Journal of Magnetism and Magnetic Materials. ISSN 0304-8853, vol. 513, p. 167078 (2020)
- Publication Type :
- Report
- Accession number :
- edsarx.1912.08025
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1016/j.jmmm.2020.167078