摘要
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.
原文 | English |
---|---|
文章編號 | 7404007 |
期刊 | IEEE Transactions on Magnetics |
卷 | 52 |
發行號 | 7 |
DOIs | |
出版狀態 | Published - 2016 7月 |
All Science Journal Classification (ASJC) codes
- 電子、光磁材料
- 電氣與電子工程