Pressure effect on magnetism and multiferroicity in Mn 2 GeO 4

T. Honda, T. Aoyama, J. S. White, Th Strässle, L. Keller, M. Kenzelmann, F. Honda, A. Miyake, K. Shimizu, Y. Wakabayashi, T. Kimura

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8 Citations (Scopus)

Abstract

The effect of high pressure exceeding 6 GPa on magnetism and multiferroicity was investigated for the olivine Mn2GeO4 that shows successive magnetic transitions at ambient pressure and a ferroelectric ground state driven by spin-spiral order. We measured heat capacity, dielectric constant, and electric polarization at various pressures using a diamond anvil cell. The pressure evolution of the magnetic structures was also investigated by powder neutron diffraction measurements using a Paris-Edinburgh press. We found that all of the magnetic transition temperatures are enhanced monotonically by applying pressure. Furthermore, the spin-driven ferroelectricity persists up to about 6 GPa but suddenly vanishes by 6.3 GPa. A consistent description of all data is achieved if an incommensurate-commensurate phase transition occurs with pressurization and causes the suppression of ferroelectricity. We discuss the origin of the observed pressure effects on the magnetism and multiferroicity in Mn2GeO4 in terms of a pressure-induced change in the superexchange magnetic interactions.

Original languageEnglish
Article number104405
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume89
Issue number10
DOIs
Publication statusPublished - Mar 10 2014
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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