Martín-Martín, Alberto; (2000) Magnetism in Uranium Intermetallic Compounds. Doctoral thesis (Ph.D), UCL (University College London).

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Abstract

What differentiates the actinides from the rare earths is the extended nature of the 5f wavefunctions. Because the energies of the 5f electrons are comparable to those of the 6d electrons, a site-based approach to actinide magnetism is certainly not of general validity, but a itinerant approaches goes too far in the opposite direction. Thus depending on the actinide element, the interactinide spacing, and the actinide environment in a compound, we find properties ranging from that of itinerant transition-like systems to that of localised lanthanide-like systems. It is clear that the magnetic properties of 5f-based intermetallics cannot be explained by either of the limiting approaches. At present, none of the existing theories is capable to explain the whole variety and richness of magnetic properties among actinide intermetallic compounds. A full understanding of their properties, which lies at the boundary between localisation and itinerancy, remains, in spite of enormous experimental and theoretical efforts, a challenging problem. The work reported in this thesis shows examples of almost every type of behaviour that can be found in f-band magnetism. From magnetic and nonmagnetic materials, to localised, itinerant, crystal field, quadrupolar transitions, damped spin waves, non Fermi liquid systems... there is a wide diversity of behaviour.

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