TY - JOUR
T1 - Element and orbital-specific observation of two-step magnetic transition in NpNiGa5
T2 - X-ray magnetic circular dichroism study
AU - Okane, T.
AU - Ohkochi, T.
AU - Inami, T.
AU - Takeda, Y.
AU - Fujimori, S. I.
AU - Kawamura, N.
AU - Suzuki, M.
AU - Tsutsui, S.
AU - Yamagami, H.
AU - Fujimori, A.
AU - Tanaka, A.
AU - Aoki, D.
AU - Homma, Y.
AU - Shiokawa, Y.
AU - Yamamoto, E.
AU - Haga, Y.
AU - Nakamura, A.
AU - Onuki, Y.
PY - 2009/9/16
Y1 - 2009/9/16
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevB.80.104419
DO - 10.1103/PhysRevB.80.104419
M3 - Article
AN - SCOPUS:70349931828
VL - 80
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
SN - 0163-1829
IS - 10
M1 - 104419
ER -