Resonant inelastic x-ray scattering from UOand UN.

Resonant inelastic x-ray scattering (RIXS) using an incident energy tuned to the uraniumN4,5absorption edges is reported from epitaxial films of-UOand UN. Theory shows that for UOthe multiplets associated with a 5configuration with a ground state of2F5/2and the excited state of2F7/2are observed. However, the strong transition predicted at a transfer energy of 1.

Resonant inelastic x-ray spectroscopy on UO as a test case for actinide materials.

Resonant inelastic x-ray spectroscopy at the uranium N absorption edge at 778 eV has been used to reveal the excitations in UO up to 1 eV. The earlier (1989) studies by neutron inelastic scattering of the crystal-field states within the H multiplet are confirmed. In addition, the first excited state of the F multiplet at ∼520 meV has been established, and there is a weak signal corresponding to the next excited state at ∼920 meV.

Critical fluctuations in the spin-orbit Mott insulator SrIrO.

X-ray magnetic critical scattering measurements and specific heat measurements were performed on the perovskite iridate [Formula: see text]. We find that the magnetic interactions close to the Néel temperature [Formula: see text] are three-dimensional. This contrasts with previous studies which suggest two-dimensional behaviour like SrIrO.

XPS Study of Ion Irradiated and Unirradiated UO2 Thin Films.

XPS determination of the oxygen coefficient kO = 2 + x and ionic (U(4+), U(5+), and U(6+)) composition of oxides UO2+x formed on the surfaces of differently oriented (hkl) planes of thin UO2 films on LSAT (Al10La3O51Sr14Ta7) and YSZ (yttria-stabilized zirconia) substrates was performed. The U 4f and O 1s core-electron peak intensities as well as the U 5f relative intensity before and after the (129)Xe(23+) and (238)U(31+) irradiations were employed. It was found that the presence of uranium dioxide film in air results in formation of oxide UO2+x on the surface with mean oxygen coefficients kO in the range 2.

Absence of superconductivity in fluorine-doped neptunium pnictide NpFeAsO.

X-ray diffraction, specific heat, magnetic susceptibility and inelastic x-ray scattering measurements on the transurarium oxypnictides NpFeAsO and NpFeAsO0.85F0.15 are presented.