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Your search keyword '"Akamatsu, Hirofumi"' showing total 4 results
Start Over Author "Akamatsu, Hirofumi" Journal physical review letters
4 results on '"Akamatsu, Hirofumi"'

2. Light-Activated Gigahertz Ferroelectric Domain Dynamics

Author

Akamatsu, Hirofumi, primary, Yuan, Yakun, additional, Stoica, Vladimir A., additional, Stone, Greg, additional, Yang, Tiannan, additional, Hong, Zijian, additional, Lei, Shiming, additional, Zhu, Yi, additional, Haislmaier, Ryan C., additional, Freeland, John W., additional, Chen, Long-Qing, additional, Wen, Haidan, additional, and Gopalan, Venkatraman, additional

Published
2018
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3. Inversion Symmetry Breaking by Oxygen Octahedral Rotations in the Ruddlesden-PopperNaRTiO4Family

Author

Akamatsu, Hirofumi, primary, Fujita, Koji, additional, Kuge, Toshihiro, additional, Sen Gupta, Arnab, additional, Togo, Atsushi, additional, Lei, Shiming, additional, Xue, Fei, additional, Stone, Greg, additional, Rondinelli, James M., additional, Chen, Long-Qing, additional, Tanaka, Isao, additional, Gopalan, Venkatraman, additional, and Tanaka, Katsuhisa, additional

Published
2014
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4. Inversion Symmetry Breaking by Oxygen Octahedral Rotations in the Ruddlesden-Popper NaRTiO4 Family.

Author

Akamatsu, Hirofumi, Atsushi Togo, Fei Xue, Gopalan, Venkatraman, Gupta, Amab Sen, Isao Tanaka, Katsuhisa Tanaka, Koji Fujita, Long-Qing Chen, Rondinelli, James M., Shiming Lei, Stone, Greg, and Toshihiro Kuge

Subjects
*PEROVSKITE, *OXYGEN, *X-ray diffraction, *SYNCHROTRONS, *OXIDES
Abstract

Rotations of oxygen octahedra are ubiquitous, but they cannot break inversion symmetry in simple perovskites. However, in a layered oxide structure, this is possible, as we demonstrate here in A-site ordered Ruddlesden-Popper NaRTiO4 (R denotes rare-earth metal), previously believed to be centric. By revisiting this series via synchrotron x-ray diffraction, optical second-harmonic generation, piczoresponse force microscopy, and first-principles phonon calculations, we find that the low-temperature phase belongs to the acentric space group P421m, which is piezoelectric and nonpolar. The mechanism underlying this large new family of acentric layered oxides is prevalent, and could lead to many more families of acentric oxides. [ABSTRACT FROM AUTHOR]

Published
2014
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