Тип публикации: статья из журнала
Год издания: 2019
Идентификатор DOI: 10.1016/j.jmmm.2019.02.026
Аннотация: Orthorhombic Pb 2 Fe 2 Ge 2 O 9 antiferromagnetic single crystals have been synthesized by a modified pseudo-flux technique and their magnetic, thermodynamic, and magnetodielectric properties have been investigated. It has been found that, below the Neel temperature (45.2 K), iron moments are arranged in a canted antiferromagnetic structure with a weak ferromagnetic moment parallel to the a axis. According to the specific heat measurement data, the T N value remains invariable in applied magnetic fields of up to 50 kOe within the experimental accuracy. The magnetic entropy in the investigated crystals attains 2Rln(2S + 1) right above T N , which is indicative of a purely magnetic nature of the transition. It has been shown that the weak ferromagnetic moment is induced by the interplay between the single-ion anisotropy and antisymmetric Dzyaloshinskii–Moriya exchange interaction, with the latter contribution being dominant. It has been established from the angular dependences of the magnetization in three orthorhombic planes that the symmetries of the magnetic and crystal structure are identical. The magnetodielectric properties of the Pb 2 Fe 2 Ge 2 O 9 single crystals have been studied at different mutual orientations of the electric and magnetic fields. The most prominent anomalies have been observed in the vicinity of the spin-flop transition in a magnetic field applied along the c axis. © 2019 Elsevier B.V.
Журнал: Journal of Magnetism and Magnetic Materials
Выпуск журнала: Vol. 479
Номера страниц: 114-120
ISSN журнала: 03048853
Издатель: Elsevier B.V.
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