Electronic structure and magnetism of actinide compounds: 6d versus 5f electrons
We have studied the electronic structure of cleaved (100) single crystals of UAs/sub x/Se/sub 1-x/, U/sub x/Th/sub 1-x/Sb, U/sub x/Y/sub 1-x/Sb, and USb/sub x/Te/sub 1-x/ with high resolution (..delta..E<150 meV) photoemission using synchrotron radiation 10< or =h..nu..< or =130 eV. In contrast to the general belief we find significant differences in the photoemission density of states near E/sub F/ for these compounds. We conclude that these differences are mainly due to valence d electrons and that U has a quasi-localized 5f/sup 3/ configuration in resonance with itinerant 6d states. This explains the quite similar magnetic behavior of U/sub x/Th/sub 1-x/Sb and USb/sub x/Te/sub 1-x/, both of which change from highly anisotropic <100> antiferromagnets (x> or approx. =0.85) to <111> ferromagnets (x< or approx. =0.85), i.e., with an increasing number of 6d electrons. Namely, the smaller ordered moment in UTe and the gradually decreasing moment in U/sub x/Th/sub 1-x/Sb for 1.0> or =x> or =0.3 are attributed to the 6d moments which are polarized antiparallel to the 5f moments.
- Research Organization:
- IBM Thomas J. Watson Research Center, Yorktown Heights, New York 10598
- OSTI ID:
- 5458123
- Journal Information:
- J. Appl. Phys.; (United States), Vol. 53:3
- Country of Publication:
- United States
- Language:
- English
Similar Records
Resonant photoemission as a tool to study f and d electrons in actinide compounds
Itinerant-5f-electron antiferromagnetism in uranium nitride: A temperature-dependent angle-resolved photoemission study
Related Subjects
ANTIMONY ALLOYS
ANTIFERROMAGNETISM
ELECTRONIC STRUCTURE
ENERGY-LEVEL DENSITY
FERROMAGNETISM
ARSENIC ALLOYS
SELENIUM ALLOYS
TELLURIUM ALLOYS
URANIUM ALLOYS
YTTRIUM ALLOYS
ACTINIDE COMPOUNDS
ANISOTROPY
D STATES
F STATES
MAGNETIC MOMENTS
MAGNETIC PROPERTIES
MONOCRYSTALS
PHOTOEMISSION
SYNCHROTRON RADIATION
ACTINIDE ALLOYS
ALLOYS
BREMSSTRAHLUNG
CRYSTALS
ELECTROMAGNETIC RADIATION
EMISSION
ENERGY LEVELS
MAGNETISM
PHYSICAL PROPERTIES
PNICTIDES
RADIATIONS
SECONDARY EMISSION
360104* - Metals & Alloys- Physical Properties