Pressure-induced ferroelectricity and enhancement of Mn-Mn exchange striction in GdMn2O5

Abstract

We report the effects of hydrostatic pressure up to p ∼ 1.73 GPa on the multiferroic and magnetoelectric properties of GdMn2O5 single crystals. The ferroelectric (FE) polarization can be enhanced at low pressures, while it decreased after reaching a maximum at p ∼ 1.30 GPa. This pressure induced variation of polarization can be ascribed to the combined results of Mn–Mn and Gd–Mn exchange striction under pressure. Our results show that the polarization induced by Mn–Mn interaction increases monotonously with increasing pressure and finally saturates above p ≳ 1.30 GPa. Interestingly, we find that a new FE phase appears in the temperature range of 31 K–38 K with pressure p ≳ 0.88 GPa. This new FE phase can be suppressed by magnetic field, but stabilized by pressure. The pressure-temperature (p–T) phase diagram of GdMn2O5 was obtained. Our analyses suggest that the pressure-induced new FE phase could arise from a non-collinear, incommensurate magnetic structure.

Gadolinium Manganese Oxide Nanorod Catalyst via a Facile Hydrothermal Approach: Application for Voltammetric Sensing of Antibiotic Drug Rifampicin in Pharmaceutical and Biological Samples

“…32 GdMn 2 O 5 single crystals were prepared and used in the ferroelectric phase at low pressures at p ∼1.30 GPa. 33 Ferroelectric polarization was induced magnetically by rare-earth RMn 2 O 5 manganite. 34 Hydrothermally prepared GdMn2O5 mullite catalyst is highly efficient in acetone (volatile organic compound) removal.…”