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  Magnetic and thermodynamic properties and spin-flop-driven magnetodielectric response of the antiferromagnetic Pb2Fe2Ge2O9 single crystals

Pankrats, A. I., Balaev, D. A., Nikitin, S. E., Freydman, A. L., Krasikov, A. A., Balaev, A. D., et al. (2019). Magnetic and thermodynamic properties and spin-flop-driven magnetodielectric response of the antiferromagnetic Pb2Fe2Ge2O9 single crystals. Journal of Magnetism and Magnetic Materials, 479, 114-120. doi:10.1016/j.jmmm.2019.02.026.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0003-31C5-7 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-D371-F
Genre: Journal Article

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 Creators:
Pankrats, A. I.1, Author
Balaev, D. A.1, Author
Nikitin, S. E.2, Author              
Freydman, A. L.1, Author
Krasikov, A. A.1, Author
Balaev, A. D.1, Author
Popkov, S. I.1, Author
Kolkov, M. I.1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              

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 Abstract: Orthorhombic Pb2Fe2Ge2O9 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 Ned 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 Pb2Fe2Ge2O9 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.

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Language(s): eng - English
 Dates: 2019-02-062019-02-06
 Publication Status: Published in print
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Title: Journal of Magnetism and Magnetic Materials
  Other : Journal of Magnetism and Magnetic Materials: MMM
  Abbreviation : J. Magn. Magn. Mater.
Source Genre: Journal
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Publ. Info: Amsterdam : NH, Elsevier
Pages: - Volume / Issue: 479 Sequence Number: - Start / End Page: 114 - 120 Identifier: ISSN: 0304-8853
CoNE: https://pure.mpg.de/cone/journals/resource/954925512464