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JETP Letters

, Volume 105, Issue 1, pp 26–33 | Cite as

Magnetic phase separation and strong enhancement of the Néel temperature at high pressures in a new multiferroic Ba3TaFe3Si2O14

  • I. S. LyubutinEmail author
  • S. S. Starchikov
  • A. G. Gavriliuk
  • I. A. Troyan
  • Yu. A. Nikiforova
  • A. G. Ivanova
  • A. I. Chumakov
  • R. Rüffer
Condensed Matter

Abstract

The high-pressure properties of a new multiferroic of the langasite family Ba3TaFe3Si2O14 were investigated in diamond-anvil cells (DAC) in the temperature range of 4.2–295 K by a new method of synchrotron Mössbauer spectroscopy. Strong enhancement of the Néel temperature T N was observed at pressures above 20 GPa associated with the structural transformation. The highest value of T N is about 130 K which is almost five times larger than the value at ambient pressure (about 27 K). It was suggested that the high value of T N appears due to redistribution of Fe ions over 3f and 2d tetrahedral sites of the langasite structure. In this case, the short Fe-O distances and favorable Fe-O-Fe bond angles create conditions for strong superexchange interactions between iron ions, and effective two-dimensional (2D) magnetic ordering appears in the (ab) plane. The separation of the sample into two magnetic phases with different T N values of about 50 and 130 K was revealed, which can be explained by the strong 2D magnetic ordering in the ab plane and 3D ordering involving inter-plane interaction.

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Copyright information

© Pleiades Publishing, Inc. 2017

Authors and Affiliations

  • I. S. Lyubutin
    • 1
    Email author
  • S. S. Starchikov
    • 1
    • 2
  • A. G. Gavriliuk
    • 1
    • 2
    • 3
  • I. A. Troyan
    • 1
    • 2
    • 3
  • Yu. A. Nikiforova
    • 1
    • 2
  • A. G. Ivanova
    • 1
    • 2
  • A. I. Chumakov
    • 4
    • 5
  • R. Rüffer
    • 4
  1. 1.FSRC “Crystallography and Photonics,”Russian Academy of SciencesMoscowRussia
  2. 2.Institute for Nuclear ResearchRussian Academy of SciencesTroitsk, MoscowRussia
  3. 3.REC “Functional Nanomaterials,”Immanuel Kant Baltic Federal UniversityKaliningradRussia
  4. 4.European Synchrotron Radiation Facility, CS40220GrenobleFrance
  5. 5.National Research Center Kurchatov InstituteMoscowRussia

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