ELECTRONIC-STRUCTURE AND MAGNETIC ORDER IN GD(AL(1-X)M(X))(2) FERROMAGNETIC COMPOUNDS

Autor(en): UFER, H
CHELKOWSKA, G
BORSTEL, G
Stichwörter: 3D-5D BAND MAGNETISM; ALLOYS; DEPENDENCE; GD(AL1-XCUX)2; GD(AL1-XMX)2; Physics; Physics, Condensed Matter; TEMPERATURE; TRANSITION-METAL INTERMETALLICS
Erscheinungsdatum: 1994
Herausgeber: PERGAMON-ELSEVIER SCIENCE LTD
Journal: SOLID STATE COMMUNICATIONS
Volumen: 92
Ausgabe: 9
Startseite: 751
Seitenende: 754
Zusammenfassung: 
Ab-initio electronic structure calculations based on the linearized muffin-tin orbital method are reported for the intermetallic alloys Gd(Al(1-x)M(x),)(2) with various nonmagnetic dopants M and x = 0, x = 0.25. The doped systems are found to exhibit a lower total density of states at the Fermi level. From the calculated angular momentum resolved partial induced conduction band magnetic moments mu(l) one can deduce that intraatomic d - f exchange at the Gd site is the dominant exchange mechanism in these systems. However, the interatomic p - f exchange for the Al/M atoms is found to play a crucial role, since mu(Al/M)(p) changes sign for dopants M hal ing more than one electron in the outermost electronic shell. This strong a dependence of the interatomic p - f exchange for certain dopants combined with the substitutional disorder in the Al/M sublattice then leads to a decrease of the effective net conduction band - 4f exchange. These mechanisms explain the experimentally observed decrease of both the Curie temperatures and the spin disorder resistivity with x for tills class of substances.
ISSN: 00381098
DOI: 10.1016/0038-1098(94)90766-8

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