Electronic correlation effects on the Curie temperature in double perovskites. (2018)

• Record Type: Journal Article
• Authors: Navarro, O.; Estrada, F.; Guzmán, E.J.; Avignon, M.
• Is Part Of: Materials today. Volume 5:Number 9(2018)Part 2
• Page Start: 17431
• Page End: 17436
• Publication Date: 2018
• Subjects: Half-metallic -- Electronic correlation -- Spintronics; Materials science -- Congresses -- Periodicals; 620.1
• DOI: 10.1016/j.matpr.2018.06.045
• Languages: English
• ISSNs: 2214-7853

Abstract

Abstract: In order to understand the role of electronic parameters controlling the half-metallic ground state and high Curie temperature in double perovskites we study the ferromagnetic compound Sr2 FeMO6, where M is a transition metal. Here, we present a theoretical electronic approach to study the thermodynamic properties of these perovskites using the Green function technique and the renormalization perturbation expansion method. Our approach is based on an interacting picture of localized Fe-electrons and conduction M-electrons via a double-exchange-type mechanism and taking into account electronic correlation. Our results show an increase of the Curie temperature together with a shift to high band filling in good agreement with experimental results.