The reserch of superconductibity emerging in structural/order phase boundary, and the exploring the related novel materials

2013 Fiscal Year Final Research Report

• Project/Area Number: 24740238
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Condensed matter physics II
• Research Institution: The University of Tokyo
• Principal Investigator: PYON Sunseng 東京大学, 工学(系)研究科(研究院), 助教 (40595972)
• Project Period (FY): 2012-04-01 – 2014-03-31
• Keywords: 超伝導 / 新物質探索 / 構造解析 / 電子状態解明

Research Abstract

Two researches were performed in this period.
We found that the superconducting state appear in IrTe2 with carrier doping. Low temperature structure and electronic states of IrTe2 were also clarified. These results contribute to development of the field of condensed matter physics.
We found that critical current density in iron-based superconductor is significantly enhanced by inducing defects by heavy ion irradiation. Furthermore, we succeeded to fabricate superconducting round wire which has large critical current density. It is shown that iron-based superconducting wire is the promising candidate for practical application.

Research Products

• [Journal Article] Enhancement of critical current densities by high-pressure sintering in (Sr,K)Fe_2As_2 PIT wires (2014)
  • Author(s): Sunseng Pyon, Yuji Tsuchiya, Hiroshi Inoue, Hideki Kajitani, Norikiyo Koizumi, Satoshi Awaji, Kazuo Watanabe, Tsuyoshi Tamegai
  • Journal Title: Superconductor Science and Technology Volume: (掲載決定)
  • Peer Reviewed
• [Journal Article] Effects of high-pressure annealing on critical current density in122 type iron pnictide wires (2014)
  • Author(s): Sunseng Pyon, Yuji Tsuchiya, Hiroshi Inoue, Norikiyo Koizumi, Hideki Kajitani, Tsuyoshi Tamegai
  • Journal Title: Physica C Volume: (掲載決定)
  • Peer Reviewed
• [Journal Article] Effects of high-pressure sintering on critical current density in Co-doped BaFe_2As_2 wires (2014)
  • Author(s): Hiroshi Inoue, Yuji Tsuchiya, Shinya Tada, Sunseng Pyon, Hideki Kajitani, Norikiyo Koizumi, and Tsuyoshi Tamegai
  • Journal Title: Physica C Volume: (掲載決定)
  • Peer Reviewed
• [Journal Article] Te 5 p orbitals bring three-dimensional electronic structure to two-dimensional Ir0.95Pt0.05Te2 (2014)
  • Author(s): D. Ootsuki, T. Toriyama, S. Pyon, K. Kudo, M. Nohara, K. Horiba, M. Kobayashi, K. Ono, H. Kumigashira, and T. Noda, T. Sugimoto, A. Fujimori, N. L. Saini, T. Konishi, Y. Ohta, and T. Mizokawa
  • Journal Title: Physical Review B Volume: Vol.89 Pages: 104506-1-4
  • DOI: 10.1103/PhysRevB.89.104506
  • Peer Reviewed
• [Journal Article] Important Roles of Te 5p and Ir 5d Spin.Orbit Interactions on the Multi-band Electronic Structure of Triangular Lattice Superconductor Ir_<1-x>Pt_xTe_2 (2014)
  • Author(s): Daiki Ootsuki, Tatsuya Toriyama, Masakazu Kobayashi, Sunseng Pyon, Kazutaka Kudo, Minoru Nohara, Takuya Sugimoto, Teppei Yoshida, Masafumi Horio, Atsushi Fujimori, Masashi Arita, Hiroaki Anzai, Hirofumi Namatame, Masaki Taniguchi, Naurang L. Saini, Takehisa Konishi, Yukinori Ohta, and Takashi Mizokawa
  • Journal Title: Journal of the Physical Society of Japan Volume: Vol.83 Pages: 033704-1-1
  • DOI: 10.7566/JPSJ.83.033704
  • Peer Reviewed
• [Journal Article] Local structural displacements across the structural phase transition in IrTe_2 : Order-disorder of dimers and role of Ir-Te correlations (2013)
  • Author(s): B. Joseph, M. Bendele, L. Simonelli, L. Maugeri, S. Pyon, K. Kudo, M. Nohara, T. Mizokawa, and N. L. Saini
  • Journal Title: Physical Review B Volume: Vol.88 Pages: 224109-1-4
  • DOI: 10.1103/PhysRevB.88.224109
  • Peer Reviewed
• [Journal Article] Enhancement of critical current densities in (Ba,K)Fe_2As_2 by 320 MeV Au irradiation in single crystals and by high-pressure sintering in PIT wires (2013)
  • Author(s): S. Pyon, T. Taen, F. Ohtake, Y. Tsuchiya, H. Inoue, H. Akiyama, H. Kajitani, N. Koizumi, S. Okayasu, and T. Tamegai
  • Journal Title: Applied Physics Express Volume: Vol.6 Pages: 123101-1-4
  • DOI: 10.7567/APEX.6.123101
  • Peer Reviewed
• [Journal Article] Switching of Conducting Planes by Partial Dimer Formation in IrTe_2 (2013)
  • Author(s): Tatsuya Toriyama, Masao Kobori, Takehisa Konishi, Yukinori Ohta, Kunihisa Sugimoto, Jungeun Kim, Akihiko Fujiwara, Sunseng Pyon, Kazutaka Kudo, and Minoru Nohara
  • Journal Title: Journal of the Physical Society of Japan Volume: Vol.83 Pages: 033701-1-5
  • DOI: 10.7566/JPSJ.83.033701
  • Peer Reviewed
• [Journal Article] Emergence of superconductivity near the structural phase boundary in Pt-doped IrTe_2 single crystals (2013)
  • Author(s): Sunseng Pyon, Kazutaka Kudo, and Minoru Nohara
  • Journal Title: Physica C, Elsevier Volume: Vol.494 Pages: 80-84
  • DOI: 10.1016/j.physc.2013.04.055
  • Peer Reviewed
• [Journal Article] Electronic Structure Reconstruction by Orbital Symmetry Breaking in IrTe_2 (2013)
  • Author(s): Daiki Ootsuki, Sunseng Pyon, Kazutaka Kudo, Minoru Nohara, Masafumi Horio, Teppei Yoshida, Atsushi Fujimori, Masashi Arita, Hiroaki Anzai, Hirofumi Namatame, Masaki Taniguchi, Naurang L. Saini, and Takashi Mizookawa
  • Journal Title: Journal of the Physical Society of Japan Volume: Vol.82 Pages: 093704-1-4
  • DOI: 10.7566/JPSJ.82.093704
  • Peer Reviewed
• [Journal Article] Suppression of Structural Phase Transition in IrTe_2 by Isovalent Rh Doping (2013)
  • Author(s): Kazutaka Kudo, Masakazu Kobayashi, Sunseng Pyon and Minoru Nohara
  • Journal Title: Journal of the Physical Society of Japan Volume: Vol.82 Pages: 085001-1-2
  • DOI: 10.7566/JPSJ.82.085001
  • Peer Reviewed
• [Journal Article] Band Jahn-Teller effects and Peierls Instability in IrTe_2 (2013)
  • Author(s): D. Ootsuki, S. Pyon, K. Kudo, M. Nohara, M. Horio, T. Yoshida, A. Fujimori, M. Arita, H. Anzai, H. Namatame, M. Taniguchi, N. L. Saini, T. Mizokawa
  • Journal Title: Journal of Physics : Conference Series Volume: Vol.428 Pages: 012018-1-4
  • DOI: 10.1088/1742-6596/428/1/012018
  • Peer Reviewed
• [Journal Article] Large, Homogeneous, and Isotropic Critical Current Density in Oxygen-Annealed Fe_1-yTe_<0.6>Se_<0.4> Single Crystal (2013)
  • Author(s): Yue Sun, Toshihiro Taen, Yuji Tsuchiya, Qingping Ding, Sunsen Pyon, Zhixiang Shi, and Tsuyoshi Tamegai
  • Journal Title: Applied Physics Express Volume: Vol.6 Pages: 043101-1-4
  • DOI: 10.7567/APEX.6.043101
  • Peer Reviewed
• [Journal Article] Angle-dependent spectral weight transfer and evidence of a symmetry-broken in-plane charge response in Ca_<1.9>Na_<0.1>CuO_2Cl_2 (2012)
  • Author(s): R. Schuster, S. Pyon, M. Knupfer, M. Azuma, M. Takano, H. Takagi, and B. B¨uchner
  • Journal Title: Physical Review B Volume: Vol.86 Pages: 245112-1-6
  • DOI: 10.1103.PhysRevB.86.245112
  • Peer Reviewed
• [Journal Article] Decrease of upper critical field with underdoping in cuprate superconductors (2012)
  • Author(s): J. Chang, N. Doiron-Leyraud, O. Cyr-Choinière, G. Grissonnanche, F. Laliberté, E. Hassinger, J-Ph. Reid, R. Daou, S. Pyon, T. Takayama, H. Takagi, and Louis Taillefer
  • Journal Title: Nature Physics Volume: Vol.8 Pages: 751-756
  • DOI: 10.1038/NPHYS2380
  • Peer Reviewed
• [Journal Article] Orbital degeneracy and Peierls instability in the triangular-lattice superconductor Ir_<1−x>Pt_xTe_2 (2012)
  • Author(s): Daiki Ootsuki, Yuki Wakisaka, Sunseng Pyon, Kazutaka Kudo, Minoru Nohara, Masashi Arita, Hiroaki Anzai, Hirofumi Namatame, Masaki Taniguchi, Naurang L. Saini, and Takashi Mizokawa
  • Journal Title: Physical Review B Volume: Vol. 86 Pages: 014519 -1-5
  • DOI: 10.1103.PhysRevB.86.014519
  • Peer Reviewed
• [Journal Article] Orbital Degeneracy, Jahn–Teller Effect, and Superconductivity in Transition-Metal Chalcogenides (2012)
  • Author(s): T. Mizokawa, T. Sudayama, Y.Wakisaka, D. Ootsuki, M. Imaizumi, T. Noji, Y. Koike, S. Pyon, K. Kudo, M. Nohara, H. Anzai, M. Arita, H. Namatame, M. Taniguchi, N.L. Saini
  • Journal Title: Journal of Superconductivity and Novel Magnetism Volume: Vol.25 Pages: 1343-1346
  • DOI: 10.1007/s10948-01201626-x
  • Peer Reviewed
• [Journal Article] Superconductivity Induced by Bond Breaking in the Triangular Lattice of IrTe_2 (2012)
  • Author(s): S. Pyon, K. Kudo and M. Nohara
  • Journal Title: Journal of the Physical Society of Japan Volume: Vol.81 Pages: 053701-1-4
  • DOI: 10.1143/JPSJ.81.053701
  • Peer Reviewed
• [Presentation] Emergence of superconductivity in the vicinity of structural phase transition in IrTe_2 (2014)
  • Author(s): S. Pyon, K. Kudo, M. Nohara
  • Organizer: International Conference on Electronic Materials 2014 (IUMRS-ICEM2014)
  • Place of Presentation: Taiwan, Taipei
  • Year and Date: 20140610-14
  • Invited
• [Presentation] Enhancement of critical current densities in 122-type iron-based superconductor in powder-in-tube wires by high pressure sintering (2014)
  • Author(s): S. Pyon, H. Inoue, Y. Tsuchiya, N. Koizumi, H. Kajitani, T. Tamegai
  • Organizer: International Conference on Electronic Materials 2014 (IUMRS-ICEM2014)
  • Place of Presentation: Taiwan, Taipei
  • Year and Date: 20140610-14
• [Presentation] 高圧下熱処理した122系鉄ニクタイド超伝導線材の臨界電流 (2014)
  • Author(s): 卞舜生、土屋雄司、井上啓、梶谷秀樹、小泉徳潔、淡路智、渡辺和雄、為ヶ井強
  • Organizer: 日本物理学会2014年年次大会
  • Place of Presentation: 東海大学(27pCE-15)
  • Year and Date: 20140327-30
• [Presentation] Effects of high pressure annealing on critical current density in 122 type iron pnictide wires (2013)
  • Author(s): S. Pyon, Y. Tsuchiya, H. Inoue, N. Koizumi, H. Kajitani, T. Tamegai
  • Organizer: 26th International Symposium on Superconductivity (ISS2013)
  • Place of Presentation: Tokyo, Japan(WT-30)
  • Year and Date: 20131218-20
• [Presentation] BaFe_2As_2系線材の臨界電流に対する高圧下熱処理効果 (2013)
  • Author(s): 卞舜生、土屋雄司、井上啓、梶谷秀樹、小泉徳潔、為ヶ井強
  • Organizer: 日本物理学会2013年秋季大会
  • Place of Presentation: 徳島大学(28aEC-13)
  • Year and Date: 20130925-28
• [Presentation] KドープBaFe_2As_2超伝導線材の臨界電流特性 (2013)
  • Author(s): 卞舜生、土屋雄司、田縁俊光、大堀高広、井上啓、為ヶ井強
  • Organizer: 日本物理学会2013年年次大会
  • Place of Presentation: 広島大学
  • Year and Date: 20130326-29
• [Presentation] Crystal growth of Pt-doped IrTe_2 (2013)
  • Author(s): S. Pyon, K. Kudo, M. Nohara
  • Organizer: Annual APS March Meeting 2013 (APS2013)
  • Place of Presentation: Baltimore, Maryland, USA
  • Year and Date: 20130318-22
• [Presentation] Emergence of superconductivity in the vicinity of the structural phase boundary in Pt doped IrTe_2 (2012)
  • Author(s): S. Pyon, K. Kudo and M. Nohara
  • Organizer: 25th International Symposium on Superconductivity(ISS2012)
  • Place of Presentation: Tokyo, Japan
  • Year and Date: 20121203-05
  • Invited
• [Presentation] PtドープIrTe_2の単結晶育成 (2012)
  • Author(s): 卞舜生、工藤一貴、野原実、大城善博、池田陽一、荒木新吾、小林達生
  • Organizer: 日本物理学会2012年秋季大会
  • Place of Presentation: 横浜国立大学
  • Year and Date: 20120918-21
• [Book] 日本物理学会誌 (2012)
  • Author(s): 卞舜生、工藤一貴、野原実
  • Total Pages: Vol.67 No.8
  • Publisher: (株)科学技術社