研究者詳細 - 谷口　博基

MISC - 谷口　博基

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Ruddlesden-Popper型酸化物Li2SrNb2O7における誘電物性

永井隆之, 中埜彰俊, 森分博紀, 澤博, 寺崎一郎, 谷口博基

日本物理学会講演概要集(CD-ROM)74 巻 ( 1 ) 2019年

Dynamical coupling of dilute magnetic impurities with quantum spin liquid state in the S = 3/2 dimer compound Ba<inf>3</inf>ZnRu<inf>2</inf>O<inf>9</inf> 査読有り

Yamamoto T.D., Taniguchi H., Terasaki I.

Journal of Physics Condensed Matter30 巻 ( 35 ) 2018年8月

記述言語：英語出版者・発行元：Journal of Physics Condensed Matter

We have investigated the dilute magnetic impurity effect on the magnetic properties of a quantum spin liquid candidate Ba3ZnRu2O9 and a spin gapped compound Ba3CaRu2O9. The magnetic ground state of each compound stands against 2% substitution of magnetic impurities for Zn or Ca. We have found that the magnetic response of these impurities, which behave as paramagnetic spins, depends on the host materials and the difference of the two manifests itself in the Weiss temperature, which can hardly be explained by the dilute magnetic impurities alone in the case of Ba3ZnRu2O9. We consider a contribution from the Ru5+ ions which would appear only in the substituted Ba3ZnRu2O9 and discuss a possible physical meaning of the observed Weiss temperature.

DOI： 10.1088/1361-648X/aad5ac

Web of Science

Scopus

PubMed

Depleted tumor suppressor miR-107 in plasma relates to tumor progression and is a novel therapeutic target in pancreatic cancer 査読有り

Imamura Taisuke, Komatsu Shuhei, Ichikawa Daisuke, Miyamae Mahito, Okajima Wataru, Ohashi Takuma, Kiuchi Jun, Nishibeppu Keiji, Konishi Hirotaka, Shiozaki Atsushi, Morimura Ryo, Ikoma Hisashi, Ochiai Toshiya, Okamoto Kazuma, Taniguchi Hiroki, Otsuji Eigo

SCIENTIFIC REPORTS7 巻 2017年7月

強誘電性シリケートBi2SiO5のLa置換効果

帯刀信吾, 酒井雄樹, 藤井康裕, 是枝聡肇, 安井伸太郎, 東正樹, 田辺賢士, 寺崎一郎, 谷口博基

日本物理学会講演概要集72 巻 ( 0 ) 頁： 2719 - 2719 2017年

記述言語：日本語出版者・発行元：一般社団法人日本物理学会

Bi_2_SiO_5_は室温以上で強誘電性を示すシリケート化合物である。本研究ではBi_2_SiO_5_中のBiをLaで1%〜10%置換した試料を作製し、誘電率測定を行った。その結果、La置換による相転移のブロード化が観測され、置換率3％で相転移が消失した。相転移が消失した試料では100〜500 Kにわたって温度変化がほとんどない、高誘電率(ε' 〜 100)が得られた。講演では、誘電応答の起源を格子ダイナミクスの観点から議論する予定である。

(In0.5Nb0.5)xTi1-xO2のラマン散乱

藤井康裕, 片山大輔, 是枝聡肇, 河原崎賢, 谷口博基, 寺崎一郎

日本物理学会講演概要集(CD-ROM)72 巻 ( 1 ) 2017年

強誘電性シリケートBi₂SiO₅ (特集強誘電体・誘電体材料研究最前線 2016)

谷口博基

Ceramics Japan = セラミックス : bulletin of the Ceramic Society of Japan51 巻 ( 10 ) 頁： 685 - 688 2016年10月

Optical sheet conductivities of layered oxides 査読有り

Tanabe Kenji, Taniguchi Hiroki, Terasaki Ichiro

JOURNAL OF PHYSICS-CONDENSED MATTER28 巻 ( 32 ) 2016年8月

Ferromagnetic Cluster Glass Phase Embedded in a Paramagnetic and Metallic Host in Non-Uniform Magnetic System CaRu1-xScxO3 査読有り

Yamamoto Takafumi D., Kotani Atsuhiro, Nakajima Hiroshi, Okazaki Ryuji, Taniguchi Hiroki, Mori Shigeo, Terasaki Ichiro

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN85 巻 ( 3 ) 2016年3月

Optical conductivity of layered calcium cobaltate Ca3Co4O9 査読有り

Tanabe Kenji, Okazaki Ryuji, Taniguchi Hiroki, Terasaki Ichiro

JOURNAL OF PHYSICS-CONDENSED MATTER28 巻 ( 8 ) 2016年3月

Novel Charge Ordering in the Trimer Iridium Oxide BaIrO3 査読有り

Terasaki Ichiro, Ito Shun, Igarashi Taichi, Asai Shinichiro, Taniguchi Hiroki, Okazaki Ryuji, Yasui Yukio, Kobayashi Kensuke, Kumai Reiji, Nakao Hironori, Murakami Youichi

CRYSTALS6 巻 ( 3 ) 2016年3月

High temperature stability of the dielectric and insulating properties of Ca(Ti, Zr)SiO5 ceramics 査読有り

Kimura Junichi, Taniguchi Hiroki, Iijima Takashi, Shimizu Takao, Yasui Shintaro, Itoh Mitsuru, Funakubo Hiroshi

APPLIED PHYSICS LETTERS108 巻 ( 6 ) 2016年2月

Heterovalent Pb-substitution in ferroelectric bismuth silicate Bi2SiO5 査読有り

Taniguchi Hiroki, Nakane Tomohiro, Nagai Takayuki, Moriyoshi Chikako, Kuroiwa Yoshihiro, Kuwabara Akihide, Mizumaki Masaichiro, Nitta Kiyofumi, Okazaki Ryuji, Terasaki Ichiro

JOURNAL OF MATERIALS CHEMISTRY C4 巻 ( 15 ) 頁： 3168-3174 2016年

Effects of element substitution on the pyroelectric phase transition of stuffed-tridymite-type BaZnGeO4 査読有り

Nagai Takayuki, Asai Shinichiro, Okazaki Ryuji, Terasaki Ichiro, Taniguchi Hiroki

SOLID STATE COMMUNICATIONS219 巻頁： 12-15 2015年10月

角度分解偏光ラマン分光による結晶性試料の振動モード解析

藤井康裕, 清水荘雄, 谷口博基, 是枝聡肇

日本結晶学会誌57 巻 ( 5 ) 頁： 285-290 - 290 2015年10月

記述言語：日本語出版者・発行元：The Crystallographic Society of Japan

Phonon properties of lead titanate were investigated by measuring polarization-direction dependence of Raman intensities. Quantitative angle-resolved Raman spectroscopy is advantageous for detecting anisotropic nature of the sample material since that reflects the symmetry of vibrational modes. In this study, a broadband half-waveplate was utilized to establish high quantitativity, stability, and spatial reliability of the angle-resolved measurement.

DOI： 10.5940/jcrsj.57.285

CiNii Books

CiNii Research

その他リンク： https://jlc.jst.go.jp/DN/JLC/20016787160?from=CiNii

Effects of the Ir Impurity on the Thermodynamic and Transport Properties of Ba4Ru3O10 査読有り

Igarashi Taichi, Okazaki Ryuji, Taniguchi Hiroki, Yasui Yukio, Terasaki Ichiro

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN84 巻 ( 9 ) 2015年9月

広帯域光散乱分光によるリラクサー強誘電体のフラクタルダイナミクスの研究

是枝聡肇, 藤井康裕, 谷口博基

日本結晶学会誌57 巻 ( 4 ) 頁： 219-225 - 225 2015年9月

記述言語：日本語出版者・発行元：日本結晶学会

We report the broadband light-scattering spectroscopy of a single crystal of a prototypical relaxor ferroelectric, Pb（Mg1/3Nb2/3）O3. A self-similar, "power-law central peak" has been observed, indicating the presence of a fractal in the crystal. A strong correspondence exists between the temperature dependence of the power exponent, and that of the reported behaviors of "polar nanoregions", which consist of the fractal percolation cluster in the crystalline matrix of the material.

DOI： 10.5940/jcrsj.57.219

CiNii Research

Structural changes and microstructures of Ba<inf>1-x</inf>Sr<inf>x</inf>Al<inf>2</inf>O<inf>4</inf> for 0 < x < 0.4 査読有り

E. Tanaka, Y. Ishii, H. Tsukasaki, S. Mori, M. Osada, H. Taniguchi, Y. Sato, Y. Kubota

Journal of the Korean Physical Society66 巻 ( 9 ) 頁： 1355 - 1358 2015年5月

© 2015, The Korean Physical Society. We have investigated the structural changes and the microstructures of Ba1-xSrxAl2O4 for 0 < x < 0.4 by using transmission electron microscope (TEM) and synchrotron radiation powder X-ray diffraction experiments. The TEM experiments revealed the existence of a structural phase boundary at approximately x = 0.1, at which the superlattice reflection spots at the 1/2 0 0 -type positions change into diffuse streaks along three equivalent <110> directions in the hexagonal structure. In addition, real-space images of Ba1-xSrxAl2O4 for 0 < x < 0.4 reveal that BaAl2O4 should be characterized as a modulated structure with triple-q modulation vectors along the <110> directions and on the other hand, Ba1-xSrxAl2O4 for 0.1 < x < 0.4 be characterized as an intermediate (precursor) state with a rigid unit mode due to structural instability. These experimental results implied that the partial substitution of Sr2+ for Ba2+ should suppress a structural instability due to the AlO4 tetrahedral network and decrease the structural phase transition temperature.

DOI： 10.3938/jkps.66.1355

Scopus

間接型強誘電体(Ba,Sr)Al2O4の強誘電相転移の特徴

田中慧里, 石井悠衣, 塚崎裕文, 森茂生, 久保田佳基, 河口彰吾, 長田実, 谷口博基

日本セラミックス協会年会講演予稿集(CD-ROM)2015 巻頁： ROMBUNNO.2H06 2015年3月

Photo-Seebeck effect in ZnS 査読有り

Shiraishi Yuuka, Okazaki Ryuji, Taniguchi Hiroki, Terasaki Ichiro

JAPANESE JOURNAL OF APPLIED PHYSICS54 巻 ( 3 ) 2015年3月

Non-uniform Magnetic System Driven by Non-magnetic Ion Substitution in CaRu1-xScxO3: Two-Component Analysis 査読有り

Yamamoto Takafumi D., Okazaki Ryuji, Taniguchi Hiroki, Terasaki Ichiro

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN84 巻 ( 1 ) 2015年1月

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