High Pressure Studies on Iron-based Superconductors

• Project/Area Number: 20840037
• Research Category: Grant-in-Aid for Young Scientists (Start-up)
• Allocation Type: Single-year Grants
• Research Field: Condensed matter physics II
• Research Institution: Nihon University
• Principal Investigator: OKADA Hironari Nihon University, 文理学部, 助教 (40508751)
• Project Period (FY): 2008 – 2009
• Project Status: Completed (Fiscal Year 2009)
• Budget Amount: ¥3,081,000 (Direct Cost: ¥2,370,000、Indirect Cost: ¥711,000); Fiscal Year 2009: ¥1,417,000 (Direct Cost: ¥1,090,000、Indirect Cost: ¥327,000); Fiscal Year 2008: ¥1,664,000 (Direct Cost: ¥1,280,000、Indirect Cost: ¥384,000)
• Keywords: 鉄系超伝導 / 圧力効果 / 圧力誘起超伝導 / 鉄系超伝導体 / 超伝導転移 / 構造相転移 / 鉄砒素系超伝導体

Research Abstract

We have performed systematic investigation of pressure effect on superconductivity of iron-based compounds LaFeAsO_<1-x>F_x and related compounds Ca(Fe_<1-x>Co_x)AsF and Fe(Se_<1-x>Te_x). We found that LaFeAsO and CaFeAsF show superconducting transition under high pressure. The transition temperature in CaFeAsF (29K) is higher than that in LaFeAsO (21K), suggesting that CaFeAsF is considered as a candidate parent compound for realizing higher transition temperature. Pressure effect on superconducting transition temperature in Fe(Se_<1-x>Te_x) is suppressed with increasing Te concentration. This result suggests that the structural instability in Fe(Se_<1-x>Te_x) is enhanced by Te substitution.

Research Products

• [Journal Article] Pressure dependence of the superconductor transition temperature of Ca(Fe1-XCox)AsF compounds: A comparison with the effect of pressure on LaFeAsO1-xFx (2010)
  • Author(s): H. Okada, H. Takahashi, S. Matsuishi, M. Hirano, K. Matsubayashi, Y. Uwatoko, H. Takahashi
  • Journal Title: Phys. Rev. B 81 Pages: 54507-54507
• [Journal Article] Anomalous He-gas high-pressure studies on superconducting LaO_<1-x>F_xFe As (2010)
  • Author(s): W.Bi, et al.
  • Journal Title: New J. Phys. 12
  • Peer Reviewed
• [Journal Article] Pressure dependence of the superconductor transition temperature of Ca(Fe_<1-x>Co_x)AsF compounds : A comparison with the effect of pressure on LaFeAsO_<1-x>F_x (2010)
  • Author(s): H.Okada, et al.
  • Journal Title: Phys.Rev.B 81
  • Peer Reviewed
• [Journal Article] Successive phase transitions under high pressure in FeTe0. 92 (2009)
  • Author(s): H. Okada, H. Takahashi, Y. Mizuguchi, Y. Takano, H. Takahashi
  • Journal Title: J. Phys. Soc. Jpn 78 Pages: 83709-83709
• [Journal Article] High-pressure studies on superconductivity in LaFeAsO_<1-x>F_x and SmFeAsO_<1-x>F_x (2009)
  • Author(s): H.Takahashi, et al.
  • Journal Title: H. Supercond. Nov. Magn. 22 Pages: 595-598
  • Peer Reviewed
• [Journal Article] Pressure studies of(La, Sm)FeAsO_<1-x>F_x and LaFePO (2009)
  • Author(s): H.Takahashi, et al.
  • Journal Title: Physica C 469 Pages: 413-417
  • Peer Reviewed
• [Journal Article] Successive phase transitions under high pressure in FeTe_<0.92> (2009)
  • Author(s): H.Okada, et al.
  • Journal Title: J.Phys.Soc.Jpn 78
  • Peer Reviewed
• [Journal Article] High-pressure ^<57>Fe Mossbauer spectroscopy of LaFeAsO (2009)
  • Author(s): T.Kawakami, et al.
  • Journal Title: J.Phys.Soc.Jpn 78
  • Peer Reviewed
• [Journal Article] Pressure study of superconducting oxypnictide LaFePO (2009)
  • Author(s): K. Igawa, et al.
  • Journal Title: Journal of the Physeal Society of Japan 78
  • Peer Reviewed
• [Journal Article] Pressure-induced superconductivity in iron pnictide compound SrFe_2As_2 (2009)
  • Author(s): K. Igawa, et al.
  • Journal Title: Journal of the Phy seal Society of Japan 78
  • Peer Reviewed
• [Journal Article] ^<75>As-NMR studies on LaFeAsO_<1-x>F_x, (x=0.14) under a pres sure of 3 GPa (2009)
  • Author(s): K. Tatsumi, et al.
  • Journal Title: Journa 1 of the Phy seal Society of Japan 78
  • Peer Reviewed
• [Journal Article] Pressure effects on superconducting and structural properties for nickel-based superconductors LaNiXO (X = P, As) (2008)
  • Author(s): H. Okada, Y. Takahashi, K. Igawa, K. Arii, H. Takahashi, T. Watanabe, H. Yanagi, Y. Kamihara, T. Kamiya, M. Hirano, H. Hosono, S. Nakano, T. Kikegawa
  • Journal Title: J. Phys. Soc. Jpn 77 Pages: 119-120
• [Journal Article] Superconductivity under high pressure in LaFeAsO (2008)
  • Author(s): H. Okada, K. Igawa, H. Takahashi, Y. kamihara, M. Hirano, M. Hosono, K. Matsubayashi, Y. Uwatoko
  • Journal Title: J. Phys. Soc. Jpn 77 Pages: 113712-113712
  • NAID: 110006983734
• [Journal Article] Superconductivity under High Pressure in LaFeAsO (2008)
  • Author(s): H. okada, et al.
  • Journal Title: Journal of the Phy seal Society of Japan 77
  • NAID: 110006983734
  • Peer Reviewed
• [Journal Article] Pressure effects on superconducting and structural properties for nickel-based superconductors LaNiXO (X=Pand As) (2008)
  • Author(s): H. okada, et al.
  • Journal Title: Journal of the Physoal Society of Japan 77Sppl. C Pages: 119-120
  • Peer Reviewed
• [Journal Article] High-pressure studies on superconducting iron-based LaFeAsO_<1-x>F_x, LaFePO and SrFe_2As_2 (2008)
  • Author(s): H. Takahashi, et al.
  • Journal Title: Journal of the Physea 1 Society of Japan 77Sppl. C Pages: 78-83
  • Peer Reviewed
• [Presentation] LaFeAsO_<1-x>F_x(x=0, 0.05, 0.08, 0.1, 0.14)の高圧下NMR (2010)
  • Author(s): 藤原直樹, ら
  • Organizer: 日本物理学会
  • Place of Presentation: 岡山大学
  • Year and Date: 2010-03-22
• [Presentation] Fe(Se_<1-x>Te_x)_yの圧力効果 (2010)
  • Author(s): 高橋弘幸, ら
  • Organizer: 日本物理学会
  • Place of Presentation: 岡山大学
  • Year and Date: 2010-03-20
• [Presentation] SmFeAsO_<1-x>F_xの圧力効果 (2010)
  • Author(s): 金一圭, ら
  • Organizer: 日本物理学会
  • Place of Presentation: 岡山大学
  • Year and Date: 2010-03-20
• [Presentation] 強磁性体LaCoPOの圧力効果 (2010)
  • Author(s): 高畑惣一, ら
  • Organizer: 日本物理学会
  • Place of Presentation: 岡山大学
  • Year and Date: 2010-03-20
• [Presentation] FeTe0. 92の圧力下粉末X線回折 (2009)
  • Author(s): 岡田宏成, ら
  • Organizer: 日本物理学会
  • Place of Presentation: 熊本大学
  • Year and Date: 2009-09-26
• [Presentation] FeTe_<0.92>の高圧下粉末X線回折 (2009)
  • Author(s): 岡田宏成, ら
  • Organizer: 日本物理学会
  • Place of Presentation: 熊本大学
  • Year and Date: 2009-09-26
• [Presentation] Fe(Se_<1-x>Te_x)の高圧下電気抵抗測定 (2009)
  • Author(s): 高橋弘幸, ら
  • Organizer: 日本物理学会
  • Place of Presentation: 熊本大学
  • Year and Date: 2009-09-26
• [Presentation] Effect of high pressure on superconductivity in Co-doped CaFeAsF (2009)
  • Author(s): H. Okada, et al.
  • Organizer: International Conference on Materials and Mechanisms of superconductivity
  • Place of Presentation: Shinjuku, Tokyo
  • Year and Date: 2009-09-09
• [Presentation] Pressure effect of superconducting oxypnictide SmFeAsO_<1-x>F_x and LaFeAsO_<1-x>F_x (2009)
  • Author(s): 高橋弘幸, et al.
  • Organizer: International Conference on Materials and Mechanisms of superconductivity
  • Place of Presentation: Shinjuku, Tokyo
  • Year and Date: 2009-09-09
• [Presentation] Pressure effect on iron-based superconductor Ca(Fe1-xCox)AsF (2009)
  • Author(s): H. Okada, et al.
  • Organizer: International Conference on Magnetism
  • Place of Presentation: Karlsruhe, Germany
  • Year and Date: 2009-07-28
• [Presentation] Pressure effect on iron-based superconductor Ca(Fe_<1-x>Co_x)AsF (2009)
  • Author(s): 岡田宏成, et al.
  • Organizer: International Conference on Magnetism
  • Place of Presentation: Karlsruhe, Germany
  • Year and Date: 2009-07-28
• [Presentation] Pressure effect for superconducting oxypnictede LaFeAsO_<1-x>F_x and related materials (2009)
  • Author(s): 高橋弘幸, et al.
  • Organizer: Joint 22th AIRAPT and 50^<th> high pressure conference of Japan
  • Place of Presentation: Odaiba, Tokyo
  • Year and Date: 2009-07-28
• [Presentation] Electrical resistivity measurement under high pressure for FeTe_<0.92> (2009)
  • Author(s): 高橋弘幸, et al.
  • Organizer: International Conference on Magnetism
  • Place of Presentation: Karlsruhe, Germany
  • Year and Date: 2009-07-27
• [Presentation] Co置換型FeAs系超伝導体Ca(Fe1-xCox)AsFの圧力効果 (2009)
  • Author(s): 岡田宏成, ら
  • Organizer: 日本物理学会
  • Place of Presentation: 立教大学
  • Year and Date: 2009-03-28
• [Presentation] FeTe_<0.92>の高圧下電気抵抗測定 (2009)
  • Author(s): 高橋弘幸ら
  • Organizer: 日本物理学会
  • Place of Presentation: 立教大学
  • Year and Date: 2009-03-28
• [Presentation] 鉄族オキシニクタイド化合物LaFePO_<1-x>F_x(x=0, 0.06)の圧力効果 (2009)
  • Author(s): 高橋由起ら
  • Organizer: 日本物理学会
  • Place of Presentation: 立教大学
  • Year and Date: 2009-03-28
• [Presentation] Co置換型FeAs系超伝導体Ca(Fe_<1-x>Co_x)AsFの圧力効果 (2009)
  • Author(s): 岡田宏成ら
  • Organizer: 日本物理学会
  • Place of Presentation: 立教大学
  • Year and Date: 2009-03-27
• [Presentation] オキシニクタイド化合物LaFeAsO1-xFxとSmFeAsOの圧力効果 (2008)
  • Author(s): 岡田宏成, ら
  • Organizer: 高圧討論会
  • Place of Presentation: 姫路商工会議所
  • Year and Date: 2008-11-13
• [Presentation] オキシニククイド化合物LaFeAs (0_<1-x>F_x)とSmFeAsOの圧力効果 (2008)
  • Author(s): 岡田宏成ら
  • Organizer: 高圧討論会
  • Place of Presentation: 姫路商工会議所
  • Year and Date: 2008-11-13
• [Presentation] 鉄ニクタイド化合物SrFe_2As_2の圧力誘起超伝導 (2008)
  • Author(s): 井川一美ら
  • Organizer: 高圧討論会
  • Place of Presentation: 姫路商工会議所
  • Year and Date: 2008-11-13
• [Presentation] 鉄族オキシニクタイド化合物LaT_MPnO (T_M=Fe, Ni : Pn = P, As)の圧力効果 (2008)
  • Author(s): 高橋由起ら
  • Organizer: 高圧討論会
  • Place of Presentation: 姫路商工会議所
  • Year and Date: 2008-11-12
• [Presentation] Ni系オキシニクタイド超伝導体LaNiXO(X=P, As)の圧力効果 (2008)
  • Author(s): 岡田宏成, ら
  • Place of Presentation: 岩手大学
  • Year and Date: 2008-09-21
• [Presentation] Fe系オキシニクタイドLaFeAsOの高圧物性 (2008)
  • Author(s): 岡田宏成, ら
  • Organizer: 日本物理学会
  • Place of Presentation: 岩手大学
  • Year and Date: 2008-09-21
• [Remarks]
  • URL: http://w3p.phys.chs.nihon-u.ac.jp/~takahashi/index.html
• [Remarks]
  • URL: http://w3p.phys.chs.nihon-u.ac.jp/~takahashi/index.html