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Neutron diffraction study of antiferromagnetic ErNi3Ga9 in magnetic fields.

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Title: Neutron diffraction study of antiferromagnetic ErNi3Ga9 in magnetic fields.
Authors: Ninomiya, Hiroki1 h.ninomiya.045@stn.nitech.ac.jp, Sato, Takaaki2, Matsumoto, Yuji1, Moyoshi, Taketo3, Nakao, Akiko3, Ohishi, Kazuki3, Kousaka, Yusuke4, Akimitsu, Jun4, Inoue, Katsuya5, Ohara, Shigeo1,2 ohara@nitech.ac.jp
Source: Physica B. May2018, Vol. 536, p392-396. 5p.
Subjects: Erbium compounds, Neutron diffraction crystallography, Antiferromagnetic materials, Specific heat, Magnetization, Magnetoresistance
Abstract: We report specific heat, magnetization, magnetoresistance, and neutron diffraction measurements of single crystals of ErNi 3 Ga 9 . This compound crystalizes in a chiral structure with space group R 32 . The erbium ions form a two–dimensional honeycomb structure. ErNi 3 Ga 9 displays antiferromagnetic order below 6.4 K. We determined that the magnetic structure is slightly amplitude–modulated as well as antiferromagnetic with q = ( 0 , 0 , 0.5 ) . The magnetic properties are described by an Ising–like model in which the magnetic moment is always along the c –axis owing to the large uniaxial anisotropy caused by the crystalline electric field effect in the low temperature region. When the magnetic field is applied along the c –axis, a metamagnetic transition is observed around 12 kOe at 2 K. ErNi 3 Ga 9 possesses crystal chirality, but the antisymmetric magnetic interaction, the so-called Dzyaloshinskii–Moriya (DM) interaction, does not contribute to the magnetic structure, because the magnetic moments are parallel to the DM–vector. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:We report specific heat, magnetization, magnetoresistance, and neutron diffraction measurements of single crystals of ErNi 3 Ga 9 . This compound crystalizes in a chiral structure with space group R 32 . The erbium ions form a two–dimensional honeycomb structure. ErNi 3 Ga 9 displays antiferromagnetic order below 6.4 K. We determined that the magnetic structure is slightly amplitude–modulated as well as antiferromagnetic with q = ( 0 , 0 , 0.5 ) . The magnetic properties are described by an Ising–like model in which the magnetic moment is always along the c –axis owing to the large uniaxial anisotropy caused by the crystalline electric field effect in the low temperature region. When the magnetic field is applied along the c –axis, a metamagnetic transition is observed around 12 kOe at 2 K. ErNi 3 Ga 9 possesses crystal chirality, but the antisymmetric magnetic interaction, the so-called Dzyaloshinskii–Moriya (DM) interaction, does not contribute to the magnetic structure, because the magnetic moments are parallel to the DM–vector. [ABSTRACT FROM AUTHOR]
ISSN:09214526
DOI:10.1016/j.physb.2017.09.057