Element and orbital-specific observation of two-step magnetic transition in NpNiGa5: X-ray magnetic circular dichroism study

T. Okane, T. Ohkochi, T. Inami, Y. Takeda, S. I. Fujimori, N. Kawamura, M. Suzuki, S. Tsutsui, H. Yamagami, A. Fujimori, A. Tanaka, D. Aoki, Y. Homma, Y. Shiokawa, E. Yamamoto, Y. Haga, A. Nakamura, Y. Onuki

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Abstract

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.

Original languageEnglish
Article number104419
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume80
Issue number10
DOIs
Publication statusPublished - 2009 Sep 16

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Okane, T., Ohkochi, T., Inami, T., Takeda, Y., Fujimori, S. I., Kawamura, N., Suzuki, M., Tsutsui, S., Yamagami, H., Fujimori, A., Tanaka, A., Aoki, D., Homma, Y., Shiokawa, Y., Yamamoto, E., Haga, Y., Nakamura, A., & Onuki, Y. (2009). Element and orbital-specific observation of two-step magnetic transition in NpNiGa5: X-ray magnetic circular dichroism study. Physical Review B - Condensed Matter and Materials Physics, 80(10), [104419]. https://doi.org/10.1103/PhysRevB.80.104419