Developing the Pressure-Temperature-Magnetic Field Phase Diagram of Multiferroic [(CH3)2NH2]Mn(HCOO)3

Amanda Clune, Nathan Harms, Kenneth R. O'Neal, Kendall Hughey, Kevin A. Smith, Dimuthu Obeysekera, John Haddock, Naresh S. Dalal, Junjie Yang, Zhenxian Liu, Janice L. Musfeldt

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

We combined Raman scattering and magnetic susceptibility to explore the properties of [(CH3)2NH2]Mn(HCOO)3 under compression. Analysis of the formate bending mode reveals a broad two-phase region surrounding the 4.2 GPa critical pressure that becomes increasingly sluggish below the order-disorder transition due to the extensive hydrogen-bonding network. Although the paraelectric and ferroelectric phases have different space groups at ambient-pressure conditions, they both drive toward P1 symmetry under compression. This is a direct consequence of how the order-disorder transition changes under pressure. We bring these findings together with prior magnetization work to create a pressure-temperature-magnetic field phase diagram, unveiling entanglement, competition, and a progression of symmetry-breaking effects that underlie functionality in this molecule-based multiferroic. That the high-pressure P1 phase is a subgroup of the ferroelectric Cc suggests the possibility of enhanced electric polarization as well as opportunity for strain control.

Original languageEnglish (US)
Pages (from-to)10083-10090
Number of pages8
JournalInorganic Chemistry
Volume59
Issue number14
DOIs
StatePublished - Jul 20 2020

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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