X-ray magnetic circular dichroism (XMCD) experiments were performed at the Np M4,5 and the GaK absorption edges of NpNiGa5 to investigate the temperature-dependent changes of magnetic properties of Np5f and Ga4p electron states. By the sum-rule analysis of the Np M4,5 XMCD data, the orbital magnetic moment μL and the spin magnetic moment μS were estimated for the Np5 f3 and 5 f4 electronic configurations and their comparison to the previous magnetization and neutron-scattering experiments suggests that the 5 f4 configuration is more likely than the 5 f3 configuration in NpNiGa5. It was found that μL μS tends to increase from the high-temperature low-moment ordered state to the low-temperature high-moment ordered state. The result of the GaK XMCD indicates that the Ga4p electrons are magnetically polarized and the temperature and magnetic-field dependences of the Ga4p orbital moment are proportional to those of the magnetization measurements.
|ジャーナル||Physical Review B - Condensed Matter and Materials Physics|
|出版ステータス||Published - 2009 9月 16|
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