First-principles study of exchange interactions and Curie temperatures of half-metallic ferrimagnetic full Heusler alloys Mn2VZ (Z=Al, Ge)
| dc.creator | Sasioglu, E. | |
| dc.creator | Sandratskii, L. M. | |
| dc.creator | Bruno, P. | |
| dc.date | 2005-04-26 | |
| dc.date.accessioned | 2026-07-25T23:27:50Z | |
| dc.description | We report the parameter-free, density functional theory calculations of interatomic exchange interactions and Curie temperatures of half-metallic ferrimagnetic full Heusler alloys Mn2VZ (Z=Al, Ge). To calculate the interatomic exchange interactions we employ the frozen-magnon approach. The Curie temperatures are calculated within the mean-field approximation to the classical Heisenberg Hamiltonian by solving a matrix equation for a multi-sublattice system. Our calculations show that, although a large magnetic moment is carried by Mn atoms, competing ferromagnetic (inter sublattice) and antiferromagnetic (intra sublattice) Mn-Mn interactions in Mn2VAl almost cancel each other in the mean-field experienced by the Mn atoms. In Mn2VGe the leading Mn-Mn exchange interaction is antiferromagnetic. In both compounds the ferromagnetism of the Mn subsystem is favored by strong antiferromagnetic Mn-V interactions. The obtained value of the Curie temperature of Mn2VAl is in good agrement with experiment. For Mn2VGe there is no experimental information available and our calculation is a prediction. | |
| dc.description | 7 pages, 3 figures | |
| dc.identifier | https://arxiv.org/abs/cond-mat/0504679 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/0504679 | |
| dc.identifier | J. Phys.: Cond. Matt. 17, 995 (2005) | |
| dc.identifier.uri | https://dspace.dare.co.zw/handle/123456789/98584 | |
| dc.subject | Materials Science | |
| dc.title | First-principles study of exchange interactions and Curie temperatures of half-metallic ferrimagnetic full Heusler alloys Mn2VZ (Z=Al, Ge) | |
| dc.type | text |