TY - JOUR
T1 - Magnetic structural unit with convex geometry
T2 - A building block hosting an exchange-striction-driven magnetoelectric coupling
AU - Kimura, Kenta
AU - Kato, Yasuyuki
AU - Yamauchi, Kunihiko
AU - Miyake, Atsushi
AU - Tokunaga, Masashi
AU - Matsuo, Akira
AU - Kindo, Koichi
AU - Akaki, Mitsuru
AU - Hagiwara, Masayuki
AU - Kimura, Shojiro
AU - Toyoda, Masayuki
AU - Motome, Yukitoshi
AU - Kimura, Tsuyoshi
N1 - Funding Information:
This work was partially supported by JSPS KAKENHI Grants No. JP16K05413, No. JP16K05449, No. JP17H02916, No. JP17H02917, No. JP17H01143, and No. JP24244058 and by the MEXT Leading Initiative for Excellent Young Researchers (LEADER). K.Y., M.T., and T.K. were partially supported by the Center for Spintronics Research Network, Osaka University. K.K., M.A., M.H., S.K., Y.M., and T.K. are partially supported by JSPS Core-to-Core Program, A. Advanced Research Networks. Numerical calculations in this work has been done using the facilities of the Supercomputer Center, the Institute for Solid State Physics, the University of Tokyo. High-field ESR measurements were carried out at the Center for Advanced High Magnetic Field Science in Osaka University under the Visiting Researcher's Program of the Institute for Solid State Physics, the University of Tokyo. This work was partly performed at the High Field Laboratory for Superconducting Materials, Institute for Materials Research, Tohoku University (Project No. 18H0014).
Funding Information:
We wish to thank P. Babkevich and H. M. Rønnow for helpful discussions. This work was partially supported by JSPS KAKENHI Grants No. JP16K05413, No. JP16K05449, No. JP17H02916, No. JP17H02917, No. JP17H01143, and No. JP24244058 and by the MEXT Leading Initiative for Excellent Young Researchers (LEADER). K.Y., M.T., and T.K. were partially supported by the Center for Spintronics Research Network, Osaka University. K.K., M.A., M.H., S.K., Y.M., and T.K. are partially supported by JSPS Core-to-Core Program, A. Advanced Research Networks. Numerical calculations in this work has been done using the facilities of the Supercomputer Center, the Institute for Solid State Physics, the University of Tokyo. High-field ESR measurements were carried out at the Center for Advanced High Magnetic Field Science in Osaka University under the Visiting Researcher's Program of the Institute for Solid State Physics, the University of Tokyo. This work was partly performed at the High Field Laboratory for Superconducting Materials, Institute for Materials Research, Tohoku University (Project No. 18H0014).
Publisher Copyright:
© 2018 American Physical Society.
PY - 2018/10/30
Y1 - 2018/10/30
N2 - We perform a combined experimental and theoretical study of a magnetic-field (B)-induced evolution of magnetic and ferroelectric properties in an antiferromagnetic material Pb(TiO)Cu4(PO4)4, whose structure is characterized by a staggered array of Cu4O12 magnetic units with convex geometry known as square cupola. Our experiments show a B-induced phase transition from a previously reported low-B linear magnetoelectric phase to a high-B magnetoelectric phase, which accompanies a 90 flop of electric polarization and gigantic magnetodielectric effect. Moreover, we observe a B-induced sign reversal of ferroelectric polarization in the high-B phase. Our model and first-principles calculations reveal that the observed complex magnetoelectric behavior is well explained in terms of a B-dependent electric polarization generated in each Cu4O12 unit by the so-called exchange-striction mechanism. The present study demonstrates that the materials design based on the magnetic structural unit with convex geometry deserves to be explored for developing strong magnetoelectric couplings.
AB - We perform a combined experimental and theoretical study of a magnetic-field (B)-induced evolution of magnetic and ferroelectric properties in an antiferromagnetic material Pb(TiO)Cu4(PO4)4, whose structure is characterized by a staggered array of Cu4O12 magnetic units with convex geometry known as square cupola. Our experiments show a B-induced phase transition from a previously reported low-B linear magnetoelectric phase to a high-B magnetoelectric phase, which accompanies a 90 flop of electric polarization and gigantic magnetodielectric effect. Moreover, we observe a B-induced sign reversal of ferroelectric polarization in the high-B phase. Our model and first-principles calculations reveal that the observed complex magnetoelectric behavior is well explained in terms of a B-dependent electric polarization generated in each Cu4O12 unit by the so-called exchange-striction mechanism. The present study demonstrates that the materials design based on the magnetic structural unit with convex geometry deserves to be explored for developing strong magnetoelectric couplings.
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U2 - 10.1103/PhysRevMaterials.2.104415
DO - 10.1103/PhysRevMaterials.2.104415
M3 - Article
AN - SCOPUS:85059865241
SN - 2475-9953
VL - 2
JO - Physical Review Materials
JF - Physical Review Materials
IS - 10
M1 - 104415
ER -