Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-09-23
Phys. Rev. B 80, 104409 (2009)
Physics
Condensed Matter
Strongly Correlated Electrons
20 pages, 2 figures; V2 as published in PRB
Scientific paper
10.1103/PhysRevB.80.104409
In the framework of the LSDA+U method electronic structure and magnetic properties of the intermetallic compound Gd2Fe17 for both rhombohedral and hexagonal phases have been calculated. On top of that, ab initio exchange interaction parameters within the Fe sublattice for all present nearest and some next nearest Fe ions have been obtained. It was found that for the first coordination sphere direct exchange interaction is ferromagnetic. For the second coordination sphere indirect exchange interaction is observed to be weaker and of antiferromagnetic type. Employing the theoretical values of exchange parameters Curie temperatures Tc of both hexagonal and rhombohedral phases of Gd2Fe17 within Weiss mean-field theory were estimated. Obtained values of Tc and its increase going from the hexagonal to rhombohedral crystal structure of Gd2Fe17 agree well with experiment. Also for both structures LSDA+U computed values of total magnetic moment coincide with experimental ones.
Kokorina E. E.
Lukoyanov Alexey V.
Medvedev Mikhail V.
Nekrasov I. A.
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