X-Ray Magnetic Circular Dichroism and Compton Scattering: Application to 5f Electron Systems

X-ray magnetic circular dichroism at the U N4,5 edges of uranium monochalcogenides US, USe and UTe

“…1, we have estimated the value of r and d as À0:088 and 0.108 for US, À0:118 and 0.144 for USe, À0:113 and 0.140 for UTe, respectively. The value of r and d for US is close to those obtained in the previous MCD studies at the M 4;5 edges [4,5].…”

“…The MCD signals at the N 5 and N 4 edges have the same sign (minus in the figure), and the MCD signals at the N 4 edge have much larger intensity than that at the N 5 edge. These properties are the same as observed in the MCD measurements at the M 4;5 edges [4,5]. The magnitude of the MCD signals becomes clearly larger in going from US to USe, and remains almost the same or slightly decreases from USe to UTe, while the line shape is not significantly changed.…”

“…The magnetic moment deduced from neutron diffraction experiments becomes larger in the order US, USe, UTe, while the lattice parameter also becomes larger in the same order [3]. For US, MCD was measured at the M 4;5 edges [4,5], although the estimation of m L and m S depends on some unknown parameters used in the sum rules. The large absorption correction made in these studies may have caused ambiguity in the estimation of the magnetic moments.…”

On the Heavy Fermion Road

“…Superconducticity and antiferromagnetic instability in cerium compounds Kernavanois et al 2003) succeed to follow the magnetic ordering closed to P C and thus cannot answer the question of the order of the magnetic transition at P C . At least, in recent neutron scattering experiments up to P = 2.45 GPa, the magnetic transition in T appears second order and any first order transition at P C will be weak (Kernavanois et al 2005).…”

Element and orbital-specific observation of two-step magnetic transition inNpNiGa5: X-ray magnetic circular dichroism study

“…26,[28][29][30][31][32][33][34][35] The first and second observations indicate an antiparallel coupling between L and S . From analogy with the result of the uranium compounds, 36,37 the third observation implies that the asymmetric line shapes of the M 5 signal might be sensitive to the environment of the 5f electrons.…”