Magnetism of ternary intermetallic compounds of Uranium  

Oleh:

Sechovsky, V. ; Havela, L.

Jenis: Article from Books - Reference
Dalam koleksi: Handbook of Magnetic Materials Volume 11, page 1-289.
Topik: Uranium magnetic; U-intermetallics
Fulltext: MagnetcMaterials_11_1.pdf (5.73MB)

Isi artikel

The electronic structure of lanthanides and actinides is characterized by partially occupied f-electron states (4f and 5f states, respectively). The magnetic and other electronic properties of actinide intermetallic compounds have, however, only little in common with the behaviour of their lanthanide counterparts, and in some characteristic features they resemble more 3d, 4d, or 5d transition metals. This is particularly striking when comparing light lanthanides with light actinides. The 4f states in the former case are usually localized, in contrast to the delocalized 5f states in light-actinide elements. The nature of the 5f states can be strongly affected by external variables like pressure and magnetic field, and also by alloying with other elements. Thus a large diversity of behaviour of compounds based on light-actinides has roots in this variable degree of the 5f-localization and in the dominance of many-body phenomena in the cross-over regime, which give rise to exotic phenomena like heavy fermions. The second vital ingredient of actinide magnetism is the strong spinorbit interaction, providing significant orbital polarization of 5f-band systems and leading to a strong coupling of the direction of 5f-moments and both crystal and electronic structure. Its most apparent consequence is a huge magnetocrystalline anisotropy observed in U-intermetallics.

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