Actinide 5f systems: experimental determination of the magnetic response function
Understanding of metallic actinide systems is in confusion. Searches for crystal-field levels with neutron spectroscopy have, for the most part, been unsuccessful, despite the acknowledged importance of the 5f electrons in determining the magnetic behavior. In systems such as UAl/sub 2/, USn/sub 3/ and UN a broad response function, S(Q vector,..omega..), reminiscent of that found in intermediate valent compounds, exists. Neutron inelastic scattering experiments on single crystals have shown the small influence of the crystal field. Instead we find an unusual response function dominated by the longitudinal susceptibility chi/sup zz/(Q vector,,..omega..) such that transverse excitations - conventional spin waves - do not exist at low energies. As yet a detailed theoretical interpretation of the measurements does not exist. Indeed, the small, although not necessarily negligible, role of the crystal field presents conceptual difficulties if we anticipate behavior analogous to that found in many lanthanide 4f systems. Some alternate approaches are discussed.
- Research Organization:
- Argonne National Lab., IL (USA)
- DOE Contract Number:
- W-31-109-ENG-38
- OSTI ID:
- 5583019
- Report Number(s):
- CONF-791142-6; TRN: 80-005119
- Resource Relation:
- Conference: International Conference on crystal field and structural effects in f-electron systems, Philadelphia, PA, USA, 12 Nov 1979
- Country of Publication:
- United States
- Language:
- English
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46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ALUMINIUM ALLOYS
RESPONSE FUNCTIONS
URANIUM ALLOYS
URANIUM NITRIDES
TIN ALLOYS
LANTHANUM ALLOYS
ARSENIC ALLOYS
CRYSTAL FIELD
ENERGY LOSSES
INTERMETALLIC COMPOUNDS
NEUTRON SPECTROSCOPY
ACTINIDE ALLOYS
ACTINIDE COMPOUNDS
ALLOYS
FUNCTIONS
LOSSES
NITRIDES
NITROGEN COMPOUNDS
PNICTIDES
RARE EARTH ALLOYS
SPECTROSCOPY
URANIUM COMPOUNDS
360104* - Metals & Alloys- Physical Properties
360204 - Ceramics
Cermets
& Refractories- Physical Properties
440103 - Radiation Instrumentation- Nuclear Spectroscopic Instrumentation