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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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, 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.

Original language	English
Article number	7404007
Journal	IEEE Transactions on Magnetics
Volume	52
Issue number	7
DOIs	https://doi.org/10.1109/TMAG.2016.2528169
Publication status	Published - 2016 Jul

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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title = "Pressure Effect on Ferroelectric Properties of GdMn2O5 and TmMn2O5",

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}",

note = "Funding Information: This work was supported in part by the U.S. Air Force Office of Scientific Research, in part by the Robert A. Welch Foundation under Grant E-1297, in part by the T. L. L. Temple Foundation, in part by the J. J. and R. Moores Endowment, and in part by the State of Texas through the Texas Center for Superconductivity at the University of Houston and Lawrence Berkeley National Laboratory by the Department of Energy (DoE). The work of J. Kim and S.-W. Cheong was supported by the DoE under Grant DOE:DE-FG02-07ER46382. Publisher Copyright: {\textcopyright} 2016 IEEE.",

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AU - Poudel, Narayan

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AU - Kim, Jaewook

AU - Cheong, Sang Wook

N1 - Funding Information: This work was supported in part by the U.S. Air Force Office of Scientific Research, in part by the Robert A. Welch Foundation under Grant E-1297, in part by the T. L. L. Temple Foundation, in part by the J. J. and R. Moores Endowment, and in part by the State of Texas through the Texas Center for Superconductivity at the University of Houston and Lawrence Berkeley National Laboratory by the Department of Energy (DoE). The work of J. Kim and S.-W. Cheong was supported by the DoE under Grant DOE:DE-FG02-07ER46382. Publisher Copyright: © 2016 IEEE.

PY - 2016/7

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N2 - 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.

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Pressure Effect on Ferroelectric Properties of GdMn₂O₅ and TmMn₂O₅

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