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The magnetic structure of the intermetallic compound EuGa$_4$ wasinvestigated using single-crystal neutron diffraction with the time-of-flight(TOF) Laue technique on the new diffractometer SENJU at MLF of J-PARC. In spiteof high neutron absorption of Eu, a vast number of diffraction spots wereobserved without isotope enrichment. The magnetic reflections were appeared atthe positions with the diffraction indices of $h+k+l{\neq}2n$ below 16 K,indicating that the ordering vector is ${\bf q}=(0~0~0)$. Continuous evolutionof magnetic reflection intensity below $T_{\rm N}$ follows a squared Brillouinfunction for $S$=7/2. By adopting a wavelength-dependent absorption collection,the magnetic structure of EuGa$_4$ was revealed that a nearly full magneticmoment of 6.4$~{\mu}_{\rm B}$ of Eu lies within the basal plane of the lattice.The present study reveals a well-localized divalent Eu magnetism in EuGa$_4$and demonstrates a high ability of SENJU to investigate materials with highneutron absorption.

Magnetic structure of divalent europium compound EuGa$_4$ studied by single crystal time-of-flight neutron diffraction