Pressure Effect on Ferroelectric Properties of GdMn2O5 and TmMn2O5

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

doi:10.1109/TMAG.2016.2528169

Pressure Effect on Ferroelectric Properties of GdMn₂O₅ and TmMn₂O₅

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

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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, P_c ≈ 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 P_c. 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	https://doi.org/10.1109/TMAG.2016.2528169
出版狀態	Published - 2016 七月

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

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10.1109/TMAG.2016.2528169

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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.",

author = "Narayan Poudel and Melissa Gooch and Bernd Lorenz and Chu, {Ching Wu} and Jaewook Kim and Cheong, {Sang Wook}",

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AU - Cheong, Sang Wook

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