岡﨑　宏之 (Hiroyuki OKAZAKI)

プロフィール
分光物性Ⅱグループ

博士研究員

メール： OKAZAKI.Hiroyuki＠spring8.or.jp


　元素戦略プロジェクトの下で，ネオジム磁石内の含有物質をin-situ高温X線回折測定で研究しています。熱処理過程での含有物質の構造や含有量変化を明らかにすることで，ネオジム磁石の磁気特性が向上する起源を解明し，希少元素を用いない高性能な磁石を開発するための指針を得ることを目的にしています。


キーワード

  • 結晶構造解析
研究成果

研究論文

  • "Signature of high Tc above 25 K in high quality superconducting diamond", H. Okazaki, T. Wakita, T. Muro, T. Nakamura, Y. Muraoka, T. Yokoya, H. Kawarada, T. Oguchi, Y. Takano Appl. Phys. Lett. 106, 052601 (2015).
  • "Fermiological Interpretation of FeTe1-xSex Thin Crystal by Quantum Conductance Oscillation", H. Okazaki, T. Yamaguchi, T. Watanabe, K. Deguchi, S. Demura, S. J. Denholme, T. Ozaki, Y. Mizuguchi, H. Takeya, T. Oguchi, Y. Takano EPL 104, 37010 (2013).
  • "鉄カルコゲナイド超伝導のメカニズム解明 (Mechanism for Inducement of the Superconductivity in Iron Chalcogenides)", H. Okazaki, K. Deguchi, Y. Takano 固体物理(Solid State Physics), Vol. 48, No. 10, 451 (2013).
  • "Evidence of Inhomogeneous Superconductivity in FeTe1-xSex by Scotch-Tape Method", H. Okazaki, T. Watanabe, T. Yamaguchi, Y. Kawasaki, K. Deguchi, S. Demura, T. Ozaki, S. J. Denholme, Y. Mizuguchi, H. Takeya, Y. Takano J. Phys. Soc. Jpn. 81, 113707 (2012).
  • "Multiple phosphorus chemical sites in heavily phosphorus-doped diamond", H. Okazaki, R. Yoshida, T. Muro, T. Nakamura, T. Wakita, Y. Muraoka, M. Hirai, H. Kato, S. Yamasaki, Y. Takano, S. Ishii, T. Oguchi, T. Yokoya Appl. Phys. Lett. 98, 082107 (2011).
  • "Photoemission Study of Electronic Structure Evolution across the Metal-Insulator Transition of Heavily B-doped Diamond", H. Okazaki, T. Arakane, K. Sugawara, T. Sato, T. Takahashi, T. Wakita, M. Hirai, Y. Muraoka, Y. Takano, S. Ishii, S. Iriyama, H. Kawarada, T. Yokoya J. Phys. Chem. Solids, 72, 582 (2011).
  • "Electronic structure of pristine and K-doped solid picene: Nonrigid band change and its implication for electron-intramolecular-vibration interaction", H. Okazaki, T. Wakita, T. Muro, Y. Kaji, X. Lee, H. Mitamura, N. Kawasaki, Y. Kubozono, Y. Yamanari, T. Kambe, T. Kato, M. Hirai, Y. Muraoka, T. Yokoya Phys. Rev. B 82, 195114 (2010).
  • "Photoemission study of Ca-intercalated graphite superconductor CaC6", H. Okazaki, R. Yoshida, K. Iwaia, K. Noami, T. Muro, T. Nakamura, T. Wakita, Y. Muraoka, M. Hirai, F. Tomioka, Y. Takano, A. Takenaka, M. Toyoda, T. Oguchi, T. Yokoya Physica C 470, S637 (2010).
  • "Spectroscopic evidence of the existence of substantial Ca 3d derived states at the Fermi level in the Ca-intercalated graphite superconductor CaC6", H. Okazaki, R. Yoshida, K. Iwai, K. Noami, T. Muro, T. Nakamura, T. Wakita, Y. Muraoka, M. Hirai, F. Tomioka, Y. Takano, A. Takenaka, M. Toyoda, T. Oguchi, T. Yokoya Phys. Rev. B 80, 035420 (2009).
  • "The electronic structure of Ca-intercalated superconducting graphite CaC6", H. Okazaki, R. Yoshida, K. Iwaia, K. Noami, T. Muro, T. Nakamura, T. Wakita, Y. Muraoka, M. Hirai, F. Tomioka, Y. Takano, A. Takenaka, M. Toyoda, T. Oguchi, T. Yokoya Physica C 469, 1041 (2009).
  • "Soft X-Ray Core-Level Photoemission Study of Boron Sites in Heavily Boron-Doped Diamond Films", H. Okazaki, R. Yoshida, T. Muro, T. Wakita, M. Hirai, Y. Muraoka, Y. Takano, S. Iriyama, H. Kawarada, T. Oguchi and T. Yokoya J. Phys. Soc. Jpn.78, 034703 (2009).
  • "Near EF electronic structure of heavily boron-doped superconducting diamond", H. Okazaki, T. Yokoya, J. Nakamura, N. Yamada, T. Nakamura, T. Muro, Y. Tamenori, T. Matsushita, Y. Takata, T. Tokushima, S. Shin, Y. Takano, M. Nagao, T. Takenouchi, H. Kawarada, T. Oguchi J. Phys. Chem. Solids 69, 2978 (2008).

    • 口頭発表

    • "Role of Excess Fe in Iron Chalcogenide Superconductor", (Invited talk)H. Okazaki, T. Yamaguchi, T. Watanabe, K. Deguchi, S. Demura, S. J. Denholme, M. Fujioka, T. Ozaki, Y. Mizuguchi, H. Takeya, T. Oguchi, Y. Takano, Electronic Materials and Applications (EMA) 2014, EMA-S12-003-2014, Orlando, January 22-24th, 2014.
    • "Shubnikov-de Haas Oscillation in FeTe1-xSex Thin Crystal", H. Okazaki, T. Yamaguchi, T. Watanabe, K. Deguchi, S. Demura, S. J. Denholme, M. Fujioka, T. Ozaki, Y. Mizuguchi, H. Takeya, T. Oguchi, Y. Takano, Novel Superconductors and Super Materials (NS2) 2013, P-051, Tokyo, November 22-23th, 2013.
    • "Superconductivity at 25 K in Heavily B-doped Diamond", H. Okazaki, T. Wakita, J. Sonoyama, T. Hamada, T. Kittaka, Y. Muraoka, T. Yokoya, T. Muro, T. Nakamura, S. Kurihara, H. Kawarada, T. Yamaguchi, H. Takeya, Y. Takano, 26th International Symposium on Superconductivity (ISS2013), PC-7, Tokyo, November 17-19th, 2013.
    • "Shubnikov-de Haas Oscillation in FeTe1-xSex Thin Crystals", H. Okazaki, T. Yamaguchi, T. Watanabe, K. Deguchi, S. Demura, S. J. Denholme, M. Fujioka, T. Ozaki, Y. Mizuguchi, H. Takeya, T. Oguchi, Y. Takano, 25th International Symposium on Superconductivity (ISS2012), PCP-45, Tokyo, December 3rd-5th, 2012.
    • "Ultrathin Film of 11 type Iron-Based Compounds Fabricated by Scotch-Tape method", H. Okazaki, T. Watanabe, T. Yamaguchi, Y. Kawasaki, K. Deguchi, S. Demura, T. Ozaki, Y. Mizuguchi, H. Takeya, Y. Takano, International Union of Materials Research Societies ? International Conference on Electronic Materials 2012 (IUMRS-ICEM 2012), B-4-O25-009, Yokohama, September 23-28th, 2012.
    • "Ultrathin Film of FeTe1-xSex Fabricated by Scotch-Tape method", H. Okazaki, T. Watanabe, T. Yamaguchi, Y. Kawasaki, K. Deguchi, S. Demura, T. Ozaki, Y. Mizuguchi, H. Takeya, and Y. Takano, International Conference on Materials and Mechanisms of Superconductivity (M2S 2012), Washington, D.C., P2-131, July 29th- August 3rd, 2012.
    • "Superconductivity on FeTe1-xSex Thin Film Fabricated by Scotch-Tape method", H. Okazaki, T. Watanabe, T. Yamaguchi, Y. Kawasaki, K. Deguchi, S. Demura, T. Ozaki, Y. Mizuguchi, H. Takeya, Y. Takano, 24th International Cryogenic Engineering Conference-International Cryogenic Materials Conference 2012 (ICEC 24 - ICMC 2012), 16P-P09-03, Fukuoka, May 14-18th, 2012.
    • "Electronic structure of pristine and K-doped solid picene by using soft x-ray photoemission spectroscopy", H. Okazaki, T. Wakita, T. Muro, Y. Kaji, X. Lee, H. Mitamura, N. Kawasaki, Y. Kubozono, Y. Yamanari, T. Kambe, T. Kato, M. Hirai, Y. Muraoka, T. Yokoya, Proceedings of the 15th Hiroshima International Symposium on Synchrotron Radiation, Hiroshima University, Hiroshima, March 3-4th, 2011.
    • "Photoemission Study of The Electronic Structure Evolution across Metal-Insulator Transition of Heavily B-doped Diamond", H. Okazaki, T. Arakane, K. Sugawara, T. Sato, T. Takahashi, T. Wakita, Y. Muraoka, M. Hirai, Y. Takano, S. Ishii, S. Iriyama, H. Kawarada, T. Yokoya, The 9th International Conference on Spectroscopies in Novel Superconductors (SNS2010), PA30, Shanghai, May 23-28th, 2010.
    • "Photoemission Study of Ca-Intercalated Graphite Superconductor CaC6", H. Okazaki, R. Yoshida, K. Iwai, K. Noami, T. Muro, T. Nakamura, T. Wakita, Y. Muraoka, M. Hirai, F. Tomioka, Y. Takano, A. Takenaka, M. Toyoda, T. Oguchi, T. Yokoya, The 9th International Conference on Materials and Mechanisms of Superconductivity (M2S-IX), PS-F-234, Tokyo, September 7-12th, 2009.
    • "The Existence of Substantial Ca 3d Derived States at EF in Ca-Intercalated Graphite Superconductor CaC6", H. Okazaki, R. Yoshida, K. Iwai, K. Noami, T. Muro, T. Nakamura, T. Wakita, Y. Muraoka, M. Hirai, F. Tomioka, Y. Takano, A. Takenaka, M. Toyoda, T. Oguchi, T. Yokoya, APS 2009 March Meeting, Pittsburgh, U.S.A., March 16-20th, 2009.
    • "The electronic structure of Ca-intercalated superconducting graphite CaC6", H. Okazaki, R. Yoshida, K. Iwai, K. Noami, T. Muro, T. Nakamura, T. Wakita, Y. Muraoka, M. Hirai, F. Tomioka, Y. Takano, A. Takenaka, M. Toyoda, T. Oguchi, T. Yokoya 21th International Symposium on Superconductivity (ISS2008), PCP56, Tsukuba, October 27-29th, 2008.
    • "Near EF electronic structure of heavily boron-doped superconducting diamond", H. Okazaki, T. Yokoya, J. Nakamura, N. Yamada, T. Nakamura, T. Muro, Y. Tamenori, T. Matushita, Y. Takata, T. Tokushima, S. Shin, Y. Takano, M. Nagao, T. Takenouchi, H. Kawarada, T. Oguchi, Yamada Conference LXI The 8th International Conference on Spectroscopies in Novel Superconductors (SNS2007), PC50, Sendai, August 20-24th, 2007.
    • "Heavily B-doped superconducting diamond studied by using inverse photoemission spectroscopy", H. Okazaki, Y. Mukaegawa, T. Wakita, T. Yokoya, Y. Muraoka, M. Hirai, H. Sato, H. Namatame, M. Taniguchi, Y. Takano, S. Iriyama, T. Takenouchi, H. Kawarada, T. Oguchi, Proceedings of the 11th Hiroshima International Symposium on Synchrotron Radiation, P30, Hiroshima, March 8-9th, 2007.
    • "Electronic states of heavily boron-doped superconducting diamond films", H. Okazaki, T. Yokoya, M. Higashigutsi, K. Shimada, H. Namatame, M. Taniguchi, Y. Takano, M. Nagao, T. Takenouchi, H. Kawarada, International Autumn Seminars on Nanoscience and Engineering in Superconductivity for Young Scientists, ATAGAWA HEIGHTS, November 23-29th, 2006.
    • "High-resolution photoemission study of superconducting diamond", H. Okazaki, T. Yokoya, M. Arita, K. Shimada, H. Namatame, M. Taniguchi, Y. Takano, M. Nagao, T. Takenouchi, H. Kawarada, T. Oguchi, Proceedings of the 10th Hiroshima International Symposium on Synchrotron Radiation, P25, Hiroshima, March 13-14th, 2006.

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