Resonant x-ray spectroscopy of uranium intermetallics at the M-4,M-5 edges of uranium | |
Article | |
关键词: MAGNETIC NEUTRON-SCATTERING; HEAVY-FERMION COMPOUNDS; CRYSTAL-FIELD; ELECTRONIC-STRUCTURE; ACTINIDE COMPOUNDS; INTERMULTIPLET TRANSITIONS; PLUTONIUM INTERMETALLICS; 5F ORBITALS; ABSORPTION; EXCITATIONS; | |
DOI : 10.1103/PhysRevB.95.245103 | |
来源: SCIE |
【 摘 要 】
We present resonant x-ray emission spectroscopic data from the uranium intermetallics UPd3, USb, USn3, and URu2Si2 at the M-4,M-5 edges of uranium, and we compare the data to those from the well-localized 5f(2) semiconductor UO2. The technique is especially sensitive to any oxidation of the surface, and this was found on the USb sample, thus preventing a good comparison with a material known to be 5f(3). We have found a small energy shift between UO2 and UPd3, both known to have localized 5f(2) configurations, which we ascribe to the effect of conduction electrons in UPd3. The spectra from U Pd-3 and URu2Si2 are similar, strongly suggesting a predominant 5f(2) configuration for URu2Si2. The valence-band resonant inelastic x-ray scattering provides information on the UP3 transitions (at about 18 eV) between the U 5f and U 6p states, as well as transitions of between 3 and 7 eV from the valence band into the unoccupied 5f states. These transitions are primarily involving mixed ligand states (O 2p or Pd, Ru 4d) and U 5f states. Calculations are able to reproduce both of these low-energy transitions reasonably well.
【 授权许可】
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