Fermi energy 5f spectral weight variation in uranium alloys

Technical Report · Tue Apr 01 04:00:00 EST 1997

DOI:https://doi.org/10.2172/603512· OSTI ID:603512

Denlinger, J. D.; Clack, J.; Allen, J. W. ^[1]

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1. Univ. of Michigan, Ann Arbor, MI (United States); and others

Uranium materials display a wide range of thermal, electrical and magnetic properties, often exotic. For more than a decade there have been efforts to use photoemission spectroscopy to develop a systematic and unified understanding of the 5f electron states giving rise to this behavior. These efforts have been hampered by a paucity of systems where changes in transport properties are accompanied by substantial spectral changes, so as to allow an attempt to correlate the two kinds of properties within some model. The authors have made resonant photoemission measurements to extract the 5f spectral weight in three systems which show varying degrees of promise of permitting such an attempt, Y{sub 1{minus}x}U{sub x}Pd{sub 3}, U(Pd{sub x}Pt{sub 1{minus}x}){sub 3} and U(Pd{sub x}Cu{sub 1{minus}x}){sub 5}. They have also measured U 4f core level spectra. The 4f spectra can be modeled with some success by the impurity Anderson model (IAM), and the 5f spectra are currently being analyzed in that framework. The IAM characterizes the 5f-electrons of a single site by an f binding energy {epsilon}{sub f}, an f Coulomb interaction and a hybridization V to conduction electrons. Latent in the model are the phenomena of 5f mixed valence and the Kondo effect.

• Research Organization: Lawrence Berkeley Lab., CA (United States)
• DOE Contract Number: FG02-90ER45416
• OSTI ID: 603512
• Report Number(s): LBNL--39981; ON: DE97007345; CNN: Grant DMR-94-23741; Grant DMR-91-07698
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
66 PHYSICS
F STATES
FERMI LEVEL
PHOTOEMISSION
SOFT X RADIATION
SPECTRAL RESPONSE
URANIUM ALLOYS