Pressure Effect on Ferroelectric Properties of GdMn2O5 and TmMn2O5

Narayan Poudel, Melissa Gooch, Bernd Lorenz, Ching Wu Chu, Jaewook Kim, Sang Wook Cheong

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

The pressure effect on the ferroelectric (FE) properties of the multiferroic compounds GdMn2O5 and TmMn2O5 was studied up to 18.2 kbars. A new FE phase was observed at a higher temperature in GdMn2O5 above a critical pressure, Pc ≈ 10 kbars. Our results indicate that pressure decouples the Gd moment from Mn spin system and splits the FE phase. Thermal expansion measurements reveal a large increase of the c-axis at the ambient-pressure FE transition. The pressure-induced contraction of the c lattice parameter is considered to be the origin of the decoupling of both spin systems above Pc. From the dielectric and FE properties of GdMn2O5, a pressureerature phase diagram can be derived. While a new phase was discovered for GdMn2O5, no significant change in polarization was observed for TmMn2O5 up to 16.6 kbars.

Original languageEnglish
Article number7404007
JournalIEEE Transactions on Magnetics
Volume52
Issue number7
DOIs
Publication statusPublished - 2016 Jul

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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