[en] Using a combination of first-principles calculations based on density functional theory and Boltzmann semi-classical transport theory, we investigate the properties of heavily $n$-type doped full Heusler Fe2YZ1-xAx compounds. Using a supercell approach and including explicitly the dopant impurities, we recover in some cases giant thermoelectric power factors as previously predicted under doping within the rigid band approximations [Phys. Rev. Lett. 114, 136601 (2015)]. In other cases, however, we highlight that the system evolves toward a ferromagnetic half-metallic ground state so that the power factor is strongly modified. We rationalize the appearance of this magnetic instability, showing that it consistent with the Stoner model. The uncovered properties of the heavily doped phases of the studied Fe2YZ1-xAx compounds appear promising for Seebeck and spin-Seebeck applications.
Disciplines :
Physics
Author, co-author :
Lemal, Sébastien ; Université de Liège > Département de physique > Physique théorique des matériaux
Ghosez, Philippe ; Université de Liège > Département de physique > Physique théorique des matériaux
Other collaborator :
Bilc, Daniel ; National Institute for Research and Development of Isotopic and Molecular Technologies > Molecular and Biomolecular Physics Department
Language :
English
Title :
First principles study of heavily doped full Heusler Fe2YZ for high thermoelectric power factor
Publication date :
02 May 2016
Number of pages :
A2
Event name :
E-MRS Spring Meeting 2016
Event organizer :
European Material Research Society
Event place :
Lille, France
Event date :
From 02-05-2016 to 06-05-2016
Audience :
International
Tags :
Tier-1 supercomputer CÉCI : Consortium des Équipements de Calcul Intensif
Funders :
The present research benefited from computational resources made available on the Tier-1 supercomputer of the Fédération Wallonie-Bruxelles, infrastructure funded by the Walloon Region under the grant agreement n°1117545
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