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

Document Type

Article

Publication Date

7-20-2020

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.

Identifier

85088027806 (Scopus)

Publication Title

Inorganic Chemistry

External Full Text Location

https://doi.org/10.1021/acs.inorgchem.0c01225

e-ISSN

1520510X

ISSN

00201669

PubMed ID

32635719

First Page

10083

Last Page

10090

Issue

14

Volume

59

Grant

DE-FC03-03N00144

Fund Ref

National Science Foundation

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