Faculty Profiles - YOKOYA Takayoshi

MISC - YOKOYA Takayoshi

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高濃度ホウ素ドープダイヤモンドの高分解能光電子ホログラフィー

細田渉, 寺嶋健成, 寺嶋健成, 藤原弘和, 矢野佑幸, 松下智裕, 室隆桂之, 木下豊彦, 高野義彦, 蔭浦泰資, 川原田洋, 小口多美夫, 脇田高徳, 脇田高徳, 村岡祐治, 村岡祐治, 横谷尚睦, 横谷尚睦

日本物理学会講演概要集(CD-ROM) 73 ( 2 ) 2018

エネルギー輸送の違いから見たカーボンナノチューブの通電加熱の効果

中條大樹, 井上寛隆, 黒田泰平, 森本大我, 林拓磨, 徳永知春, 池田直, 横谷尚睦, 藤森和博, 羽田真毅, 西川亘, 山下善文, 紀和利彦, 林靖彦

応用物理学会春季学術講演会講演予稿集(CD-ROM) 65th 2018

CeO_1-xF_xBiS₂の電子状態

脇田高徳, 寺嶋健成, 浜田貴裕, 藤原弘和, 簑原誠人, 小林正起, 堀場弘司, 組頭広志, KUTLUK G., 長尾雅則, 綿打敏司, 田中功, 出村郷志, 岡崎宏之, 高野義彦, 水口佳一, 三浦大介, 岡田耕三, 村岡祐治, 横谷尚睦, 横谷尚睦

日本放射光学会年会・放射光科学合同シンポジウム(Web) 31st 2018

Electronic states modulated by electric polarization in ferroelectric BaTiO₃

Oshime N, Itoh M, Fujii T, Yasui A, Kano J, Ikenaga E, Yasui S, Hinokuma S, Ikeda N, Hamasaki Y, Yasuhara S, Yokoya T

Meeting Abstracts of the Physical Society of Japan 72 2307 - 2307 2017.1

時間分解電子線回折法を用いたEuBaCo₂O_5.38の構造ダイナミクス計測

羽田真毅, 鈴木達也, 阿部伸行, 有馬孝尚, 沖本洋一, 腰原伸也, 慶尾直哉, 村上寛虎, 西川亘, 山下善文, 林靖彦, 横谷尚睦, 松尾二郎, 浅香透

日本物理学会講演概要集 72 1128 - 1128 2017.1

Direct observation of band bending structure on ferroelectric BaTiO₃

Oshime N, Kano J, Ikenaga E, Yasui S, Hinokuma S, Ikeda N, Yokoya T, Fujii T

Meeting Abstracts of the Physical Society of Japan 72 ( 0 ) 2725 - 2725 2017

Language：Japanese Publisher：The Physical Society of Japan

自発分極は試料内部の静電ポテンシャルを傾斜させる。強誘電体の原子軌道エネルギーはこの傾斜に応じて系統的に変化すると考えられる。この現象はバンドベンディングと呼ばれ40年以上に渡り予想されてきた。今回，BaTiO_3_においてバンドベンディング現象を直接的に観測したので報告する。本研究において得られた実験結果は，エピタキシャル製膜された強誘電体薄膜試料と深さ分解光電子分光実験を組み合わせることで初めて達成できた。

DOI： 10.11316/jpsgaiyo.72.1.0_2725

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Observation of spin depolarization in half-metal CrO₂ by high-resolution spin-resolved photoemission spectroscopy

Fujiwara Hirokazu, Yokoya Takayoshi, Terashima Kensei, Sunagawa Masanori, Ogata Makoto, Yaji Koichiro, Harasawa Ayumi, Shin Shik, Wakita Takanori, Muraoka Yuji

Meeting Abstracts of the Physical Society of Japan 72 ( 0 ) 797 - 797 2017

Temperature dependent local atomic displacements in Li_x(NH₃)_yFe₂Se₂

Paris E., Simonelli L., Wakita T., Marini C., Lee J.-H., Olszewski W., Terashima K., Kakuto T., Nishimoto N., Kimura T., Kudo K., Kambe T., Nohara M., Yokoya T., Saini N.L.

Meeting Abstracts of the Physical Society of Japan 71 1843 - 1843 2016

Language：Japanese Publisher：The Physical Society of Japan

We have used temperature dependent extended x-ray absorption fine structure (EXAFS) measurements to investigate local atomic displacements in single crystals of the recently discovered ammonia-intercalated iron selenide superconductor. Using in-plane polarized EXAFS measurements at the Fe K-edge we have obtained direct information on the local Fe-Se and Fe-Fe bondlenghts and corresponding distance-distance correlation functions given by their mean square relative displacements (MSRD). We find that the chalcogen (Se) height in the intercalated system is lower than the one in the binary FeSe, suggesting compressed FeSe4 tetrahedron in the title system. Furthermore, the results reveal an anomalous change in the atomic correlations across the superconducting transition temperature Tc, appearing as a clear drop in the MSRD, suggesting hardening of the local modes similar to other classes of superconductors. This observation indicates that local atomic correlations should have some direct correlation with the superconductivity in these materials.

DOI： 10.11316/jpsgaiyo.71.2.0_1843

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Electronic structure of AxFe2-ySe2 (A=K,Rb) studied by angle-resolved photoemission spectroscopy Reviewed

Sunagawa M., Shimada K., Namatame H., Taniguchi M., Suzuki K., Usui H., Kuroki K., Wakita T., Muraoka Y., Yokoya T., Terashima K., Fujiwara H., Fukura T., Takeda A., Tanaka M., Takeya H., Takano Y., Arita M.

Meeting Abstracts of the Physical Society of Japan 71 ( 0 ) 2023 - 2023 2016

Control of Fermi Level by Variation of Charge Ordering State in Yb_1-xTi_xFe₂O₄

Nagata Tomoko, Okazaki Hiroyuki, Wakita Takanori, Fukura Tetsushi, Iwata Nobuyuki, Yamamoto Hiroshi, Yokoya Takayoshi, Ikeda Naoshi

Transactions of the Materials Research Society of Japan 41 ( 3 ) 269 - 271 2016

Language：English Publisher：The Materials Research Society of Japan

Fermi level and valence state were investigated in RFe₂O₄ (R = Y, Dy, Ho, Er, Tm, Yb, Lu, Sc, or In), which shows magnetoelectric effect originating from charge and magnetic orders of Fe²⁺ and Fe³⁺. We succeeded in controlling the Fermi level of YbFe₂O₄ system by Ti⁴⁺ substitution for Yb³⁺. The variation in the ratio of Fe²⁺ to Fe³⁺ is suggested to the origin of the Fermi level variation. This report suggests the possibility of simple selection of conduction type in functional oxide.

DOI： 10.14723/tmrsj.41.269

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Photoemission spectroscopy of new layered superconductor CsPbxBi4-xTe6

Okazaki Hiroyuki, Hamada Takahiro, Terashima Kensei, Iwata Keiji, Wakita Takanori, Tanaka Masashi, Takano Yoshihiko, Muraoka Yuji, Yokoya Takayoshi

Meeting Abstracts of the Physical Society of Japan 71 2253 - 2253 2016

Study of electronic states on Sr_2-xLa_xIrO₄ (x = 0.04, 0.08) : Angle-resolved photoelectron spectroscopy

Terashima K., Sunagawa M., Fujiwara H., Fujii M., Horigane K., Kobayashi K., Horie R., Akimitsu J., Muraoka Y., Yokoya T.

Meeting Abstracts of the Physical Society of Japan 71 1791 - 1791 2016

Inhomogeneous electronic state in Li_xCoO₂ (x=0.71)

Yagihara Hajime, Matsumoto Ryoya, Yosino Tubasa, Okamoto Yohei, Wakita Takanori, Yokoya Takayoshi, Iwai Chika, Miyosi Kiyotaka, Takeuti Jun, Kandyba Victor, Barinov Alexei, Saini Naurang L., Mizokawa Takasi

Meeting Abstracts of the Physical Society of Japan 71 1950 - 1950 2016

Fe 3p-3d resonant inverse photoemission spectroscopy on YbFe₂O₄

Fukura T., Wakita T., Fujiwara K., Terashima K., Sato H., Namatame H., Taniguchi M., Ikeda N., Muraoka Y., Yokoya T.

Meeting Abstracts of the Physical Society of Japan 71 2527 - 2527 2016

22pBE-10 Relationship between carrier concentration and T_c of heavily boron-doped diamond superconducting films prepared by a hot filament CVD method

Muraoka Y., Kittaka T., Inubushi S., Terashima K., Wakita T., Yokoya T.

Meeting Abstracts of the Physical Society of Japan 70 2271 - 2271 2015

21pBA-12 Observation of hole-like Fermi surface in K_xFe_<2-y>Se_2

Sunagawa M., Terashima K., Hamada K., Fujiwara H., Tanaka M., Takeya H., Takano Y., Arita M., Shimada K., Namatame H., Taniguchi M., Suzuki K., Usui H., Kuroki K., Wakita T., Muraoka Y., Yokoya T.

Meeting Abstracts of the Physical Society of Japan 70 1997 - 1997 2015

21aAE-12 Quantitative measurement of local work functions by PEEM

Wakita T., Terashima T., Muraoka Y., Yokoya T.

Meeting Abstracts of the Physical Society of Japan 70 2515 - 2515 2015

22pBE-7 Angle-resolved photoemission study of Ln(O,F)BiS_2 (Ln=La, Ce)

Terashima K., Wakita T., Sunagawa M., Fujiwara H., Hamada T., Nagao M., Watauchi S., Tanaka I., Minohara M., Horiba K., Ono K., Kumigashira H., Muro T., Okazaki H., Takano Y., Muraoka Y., Yokoya T.

Meeting Abstracts of the Physical Society of Japan 70 2268 - 2268 2015

21aCN-5 Bulk sensitive spin-resolved photoemission spectroscopy studies on CrO_2 II

Fujiwara Hirokazu, Sunagawa Masanori, Kittaka Tomoko, Ogata Makoto, Terashima Kensei, Wakita Takanori, Muraoka Yuji, Yokoya Takayoshi

Meeting Abstracts of the Physical Society of Japan 70 1421 - 1421 2015

22aPS-11 Electrical resistivity measurements of vacuum-evaporated K-doped picene films prepared at low temperature

Hamada T., Jabuchi T., Wakita T., Muraoka Y., Yokoya T.

Meeting Abstracts of the Physical Society of Japan 70 2109 - 2109 2015

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