Magnetic structure of divalent europium compound EuGa4 studied by single-crystal time-of-flight neutron diffraction

Takuro Kawasaki, Koji Kaneko, Ai Nakamura, Naofumi Aso, Masato Hedo, Takao Nakama, Takashi Ohhara, Ryoji Kiyanagi, Kenichi Oikawa, Itaru Tamura, Akiko Nakao, Koji Munakata, Takayasu Hanashima, Yoshichika Onuki

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Abstract

The magnetic structure of the intermetallic compound EuGa4 was investigated using single-crystal neutron diffraction with the time-of-flight (TOF) Laue technique on the new diffractometer SENJU at the Materials and Life Science Experimental Facility (MLF) of the Japan Proton Accelerator Research Complex (J-PARC). Despite of the high neutron absorption of Eu, a vast number of diffraction spots were observed without isotope enrichment. The magnetic reflections appeared at positions with diffraction indices of h + k + l ≠ 2n below 16 K, indicating that the ordering vector is q = (0, 0, 0). The continuous evolution of the magnetic reflection intensity below TN follows a squared Brillouin function for S = 7/2. By adopting a wavelength-dependent absorption collection, the magnetic structure of EuGa4 was revealed that a nearly full magnetic moment of 6.4 μB of Eu lies within the basal plane of the lattice. In this study, we reveal a well-localized divalent Eu magnetism in EuGa4 and demonstrate a high ability of SENJU to investigate materials with high neutron absorption.

Original languageEnglish
Article number114711
Journaljournal of the physical society of japan
Volume85
Issue number11
DOIs
Publication statusPublished - 2016 Nov 15

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Kawasaki, T., Kaneko, K., Nakamura, A., Aso, N., Hedo, M., Nakama, T., Ohhara, T., Kiyanagi, R., Oikawa, K., Tamura, I., Nakao, A., Munakata, K., Hanashima, T., & Onuki, Y. (2016). Magnetic structure of divalent europium compound EuGa4 studied by single-crystal time-of-flight neutron diffraction. journal of the physical society of japan, 85(11), [114711]. https://doi.org/10.7566/JPSJ.85.114711