Search Results - "Okimoto, Yoichi"

Enhanced Negative Thermal Expansion Induced by Simultaneous Charge Transfer and Polar–Nonpolar Transitions by Nishikubo, Takumi, Sakai, Yuki, Oka, Kengo, Watanuki, Tetsu, Machida, Akihiko, Mizumaki, Masaichiro, Maebayashi, Koki, Imai, Takashi, Ogata, Takahiro, Yokoyama, Keisuke, Okimoto, Yoichi, Koshihara, Shin-ya, Hojo, Hajime, Mizokawa, Takashi, Azuma, Masaki

“…Negative thermal expansion (NTE) induced by simultaneous mechanisms, that is, charge transfer and polar–nonpolar transitions, was observed for the first time…”
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Direct observation of collective modes coupled to molecular orbital-driven charge transfer by Ishikawa, Tadahiko, Hayes, Stuart A., Keskin, Sercan, Corthey, Gastón, Hada, Masaki, Pichugin, Kostyantyn, Marx, Alexander, Hirscht, Julian, Shionuma, Kenta, Onda, Ken, Okimoto, Yoichi, Koshihara, Shin-ya, Yamamoto, Takashi, Cui, Hengbo, Nomura, Mitsushiro, Oshima, Yugo, Abdel-Jawad, Majed, Kato, Reizo, Miller, R. J. Dwayne

“…Correlated electron systems can undergo ultrafast photoinduced phase transitions involving concerted transformations of electronic and lattice structure…”
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Orbital Degree of Freedom in Conducting Platinum–Dithiolene Complex Salts by Yamamoto, Takashi, Hiraga, Daiki, Arashi, Ikumi, Takasugi, Koh, Naito, Toshio, Ishikawa, Tadahiko, Okimoto, Yoichi, Koshihara, Shin-ya, Nomura, Mitsushiro, Kato, Reizo

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Polarization- and Strain-Mediated Control of Negative Thermal Expansion and Ferroelasticity in BiInO3–BiZn1/2Ti1/2O3 by Nishikubo, Takumi, Ogata, Takahiro, Venkataraman, Lalitha Kodumudi, Isaia, Daniel, Pan, Zhao, Sakai, Yuki, Hu, Lei, Kawaguchi, Shogo, Machida, Akihiko, Watanuki, Tetsu, Yu, Hongwu, Okimoto, Yoichi, Koshihara, Shin-ya, Mori, Shigeo, Rödel, Jürgen, Azuma, Masaki

“…A solid solution between polar perovskite oxides BiInO3 and BiZn1/2Ti1/2O3 with the atomic displacement of Bi3+ and B-site (In and Zn1/2Ti1/2) as the origin of…”
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Enhanced Spontaneous Polarization by V4+ Substitution in a Lead-Free Perovskite CaMnTi2O6 by Fukuda, Masayuki, Nishikubo, Takumi, Pan, Zhao, Sakai, Yuki, Zhang, Mao-Hua, Kawaguchi, Shogo, Yu, Hongwu, Okimoto, Yoichi, Koshihara, Shin-ya, Itoh, Mitsuru, Rödel, Jürgen, Azuma, Masaki

“…Spontaneous polarization (P s) of novel order–disorder type lead-free ferroelectric CaMnTi2O6 was successfully enhanced by partial V4+ substitution for Ti4+. A…”
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Ferroelectricity near room temperature in co-crystals of nonpolar organic molecules by Horiuchi, Sachio, Ishii, Fumiyuki, Kumai, Reiji, Okimoto, Yoichi, Tachibana, Hiroaki, Nagaosa, Naoto, Tokura, Yoshinori

“…The research on ferroelectric materials-mostly inorganic compounds or organic polymers-is increasingly motivated by both basic scientific concerns and the…”
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Ultrafast Control of Ferroelectricity with Dynamical Repositioning of Protons in a Supramolecular Cocrystal Studied by Femtosecond Nonlinear Spectroscopy by Umanodan, Tsugumi, Kaneshima, Keisuke, Takeuchi, Kengo, Ishii, Nobuhisa, Itatani, Jiro, Hirori, Hideki, Sanari, Yasuyuki, Tanaka, Koichiro, Kanemitsu, Yoshihiko, Ishikawa, Tadahiko, Koshihara, Shin-ya, Horiuchi, Sachio, Okimoto, Yoichi

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Nonlinear Optical Properties in an Epitaxial YbFe2O4 Film Probed by Second Harmonic and Terahertz Generation by Yu, Hongwu, Okimoto, Yoichi, Morita, Atsuya, Shimanuki, Shuhei, Takubo, Kou, Ishikawa, Tadahiko, Koshihara, Shin-ya, Minakami, Ryusei, Itoh, Hirotake, Iwai, Shinichiro, Ikeda, Naoshi, Sakagami, Takumi, Nozaki, Mayu, Fujii, Tatsuo

“…An epitaxial film of YbFe2O4, a candidate for oxide electronic ferroelectrics, was fabricated on yttrium-stabilized zirconia (YSZ) substrate by magnetron…”
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Ultrafast Nonlinear Spectroscopy in (111) Oriented Bismuth Ferrite Oxide by Yu, Hongwu, Takubo, Kou, Ishikawa, Tadahiko, Koshihara, Shin-ya, Hada, Masaki, Asaka, Toru, Ozawa, Keita, Shigematsu, Kei, Azuma, Masaki, Okimoto, Yoichi

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Time-Resolved Infrared Vibrational Spectroscopy of the Photoinduced Phase Transition of Pd(dmit)2 Salts Having Different Orders of Phase Transition by Fukazawa, Naoto, Tanaka, Takahiro, Ishikawa, Tadahiko, Okimoto, Yoichi, Koshihara, Shin-ya, Yamamoto, Takashi, Tamura, Masafumi, Kato, Reizo, Onda, Ken

“…To clarify the mechanism of the later process of photoinduced phase transition (PIPT) in organic charge-transfer complexes, we examined by time-resolved…”
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Ultrafast opto-protonics in a hydrogen-bonded π-molecular ferroelectric crystal by Okimoto, Yoichi, Xia, Peiyu, Itatani, Jiro, Matsushima, Haruka, Ishikawa, Tadahiko, Koshihara, Shin-ya, Horiuchi, Sachio

“…We investigated the ultrafast photo-response of a ferroelectric co-crystal of Hdppz–Hca composed of protonated 2,3-di (2-pyridinyl)pyrazine (Hdppz) and…”
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Picosecond dynamics in layered cobalt perovskites studied by time-resolved Raman spectroscopy by Fukaya, Ryo, Yamaya, Nao, Ishikawa, Tadahiko, Koshihara, Shin-ya, Okimoto, Yoichi, Onda, Ken, Isayama, Akira, Sasagawa, Takao, Horigane, Kazumasa

“…Picosecond dynamics of the photoexcited charge-ordered perovskite-type cobalt oxides La$_{{1.5}}$Ca$_{{0.5}}$CoO$_{{4}}$ and…”
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Quantum Phase Transition in Organic Charge-Transfer Complexes by Horiuchi, Sachio, Okimoto, Yoichi, Kumai, Reiji, Tokura, Yoshinori

“…A phase transition in an organic charge-transfer complex, which originates from the neutral-ionic valence instability, can be tuned toward zero kelvin with use…”
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Anisotropy of Mott-Hubbard gap transitions due to spin and orbital ordering in LaVO3 and YVO3 by MIYASAKA, Shigeki, OKIMOTO, Yoichi, TOKURA, Yoshinori

“…Anisotropic optical spectra coupled with antiferromagnetic spin ordering (SO) and orbital ordering (OO) have been investigated for single crystals of LaVO3 and…”
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Control of magnetic-field effect on electroluminescence in Alq3-based organic light emitting diodes by Odaka, Hidefumi, Okimoto, Yoichi, Yamada, Toshikazu, Okamoto, Hiroshi, Kawasaki, Masashi, Tokura, Yoshinori

“…The magnetic-field effect on electroluminescence (EL) has been investigated for the tris-(8-hydroxyquinolino) aluminum (Alq3)-based organic light emitting…”
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Chemical approach to neutral–ionic valence instability, quantum phase transition, and relaxor ferroelectricity in organic charge-transfer complexes by Horiuchi, Sachio, Kumai, Reiji, Okimoto, Yoichi, Tokura, Yoshinori

“…Neutral–ionic (NI) phase transition is a reversible switching of organic charge-transfer complexes between distinct valence states by external stimuli. This…”
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Coherent dynamics of photoinduced phase formation in a strongly correlated organic crystal by Matsubara, Yoshitaka, Ogihara, Sho, Itatani, Jiro, Maeshima, Nobuya, Yonemitsu, Kenji, Ishikawa, Tadahiko, Okimoto, Yoichi, Koshihara, Shin-ya, Hiramatsu, Takaaki, Nakano, Yoshiaki, Yamochi, Hideki, Saito, Gunzi, Onda, Ken

“…The photoinduced phase formation in a strongly correlated crystal (EDO-TTF) sub(2)PF sub(6) (EDO-TTF: 4,5-ethylenedioxytetrathiafulvalene) is investigated…”
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Different Time-Scale Relaxation Dynamics in Organic Supramolecular Ferroelectrics Studied by Linear and Nonlinear Spectroscopy by Umanodan, Tsugumi, Tanaka, Sei’ichi, Naruse, Suguru, Ishikawa, Tadahiko, Onda, Ken, Koshihara, Shin-ya, Horiuchi, Sachio, Okimoto, Yoichi

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Photoinduced oxygen transport in cobalt double-perovskite crystal EuBaCo2O5.39 by Hada, Masaki, Ohmura, Satoshi, Ishikawa, Tadahiko, Saigo, Masaki, Keio, Naoya, Yajima, Wataru, Suzuki, Tatsuya, Urushihara, Daisuke, Takubo, Kou, Masaki, Yusuke, Kuwahara, Makoto, Tsuruta, Kenji, Hayashi, Yasuhiko, Matsuo, Jiro, Yokoya, Takayoshi, Onda, Ken, Shimojo, Fuyuki, Hase, Muneaki, Ishihara, Sumio, Asaka, Toru, Abe, Nobuyuki, Arima, Taka-hisa, Koshihara, Shin-ya, Okimoto, Yoichi

“…•Photoinduced oxide ion motions observed in EuBaCo2O5.39 crystals.•Time-resolved electron diffraction combined with transient optical measurements.•The oxide…”
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Photoinduced Neutral-to-Ionic Phase Transition in Tetrathiafulvalene-p-chloranil Studied by Time-Resolved Vibrational Spectroscopy by Matsubara, Yoshitaka, Okimoto, Yoichi, Yoshida, Tatsushi, Ishikawa, Tadahiko, Koshihara, Shin-ya, Onda, Ken

“…We studied the photoinduced neutral-to-ionic phase transition in tetrathiafulvalene- p -chloranil (TTF-CA) using time-resolved infrared (IR) vibrational…”
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