TY - JOUR
T1 - Giant spin-driven ferroelectric polarization in TbMnO3 under high pressure
AU - Aoyama, T.
AU - Yamauchi, K.
AU - Iyama, A.
AU - Picozzi, S.
AU - Shimizu, K.
AU - Kimura, T.
N1 - Funding Information:
We thank A. Miyake for his help in high-pressure experiments, and M. Misek and J.P. Attfield for their enlightening discussions. This work was supported by Grant-in-Aid for the JSPS Fellows (13J01596) and JSPS KAKENHI Grant Numbers 24244058 and 24740235, and the Italian Ministry of Research through the project MIUR-PRIN ‘Interfacce di ossidi: nuove proprietàemergenti, multifunzionalità e dispositivi per l’elettronica e l’energia (OXIDE)’.
Publisher Copyright:
© Macmillan Publishers Limited. All rights reserved.
PY - 2014
Y1 - 2014
N2 - The recent research on multiferroics has provided solid evidence that the breaking of inversion symmetry by spin order can induce ferroelectric polarization P. This type of multiferroics, called spin-driven ferroelectrics, often show a gigantic change in P on application of a magnetic field B. However, their polarization (<∼0.1 μC cm -2) is much smaller than that in conventional ferroelectrics (typically several to several tens of μC cm -2). Here we show that the application of external pressure to a representative spin-driven ferroelectric, TbMnO 3, causes a flop of P and leads to the highest P (≈1.0 μC cm -2) among spin-driven ferroelectrics ever reported. We explain this behaviour in terms of a pressure-induced magnetoelectric phase transition, based on the results of density functional simulations. In the high-pressure phase, the application of B further enhances P over 1.8 μC cm -2. This value is nearly an order of magnitude larger than those ever reported in spin-driven ferroelectrics.
AB - The recent research on multiferroics has provided solid evidence that the breaking of inversion symmetry by spin order can induce ferroelectric polarization P. This type of multiferroics, called spin-driven ferroelectrics, often show a gigantic change in P on application of a magnetic field B. However, their polarization (<∼0.1 μC cm -2) is much smaller than that in conventional ferroelectrics (typically several to several tens of μC cm -2). Here we show that the application of external pressure to a representative spin-driven ferroelectric, TbMnO 3, causes a flop of P and leads to the highest P (≈1.0 μC cm -2) among spin-driven ferroelectrics ever reported. We explain this behaviour in terms of a pressure-induced magnetoelectric phase transition, based on the results of density functional simulations. In the high-pressure phase, the application of B further enhances P over 1.8 μC cm -2. This value is nearly an order of magnitude larger than those ever reported in spin-driven ferroelectrics.
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U2 - 10.1038/ncomms5927
DO - 10.1038/ncomms5927
M3 - Article
AN - SCOPUS:84923253101
VL - 5
JO - Nature Communications
JF - Nature Communications
SN - 2041-1723
M1 - 4927
ER -