‘Lu-paradox’ as a consequence of the different magnetic ground states of the R(Co,Al)2 (R  heavy RE and Y) and Lu(Co,Al)2 compounds

The low temperature magnetic characteristics of the Y1−tLut(Co0.88Al0.12)2 system were determined. The drastic change from a weakly to strongly ferromagnetic ground state observed at t = 0.38 is discussed in the itinerant model by using the Landau expression for free energy expanded up to the eighth...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 1995-02, Vol.140-144, p.827-828
Main Authors: Dubenko, I.S., Levitin, R.Z., Markosyan, A.S., Snegirev, V.V., Sokolov, A.Yu, Yamada, H.
Format: Article
Language:English
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Summary:The low temperature magnetic characteristics of the Y1−tLut(Co0.88Al0.12)2 system were determined. The drastic change from a weakly to strongly ferromagnetic ground state observed at t = 0.38 is discussed in the itinerant model by using the Landau expression for free energy expanded up to the eighth power of magnetization. The ‘Lu-paradox’, that the Curie temperature of Lu(Co1−xAlx)2 is higher than that of isostructural R(Co1−xAlx)2 with some heavy RE and Y (for x > 0.12), is interpreted considering the magnetic ground state of the itinerant electron subsystem to be strongly ferromagnetic in the Lu-based system and weakly ferromagnetic in the RE-based ones.
ISSN:0304-8853
DOI:10.1016/0304-8853(94)00943-0