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(In Japanese)極限環境状態における現象 低次元金属・超伝導の超異方性強磁場効果

Research report code R990004281
Posted date Feb 6, 2001
Researchers
  • (In Japanese)石黒 武彦
Affiliation
  • (In Japanese)京都大学名誉教授
Research organization
  • (In Japanese)京都大学大学院理学研究科
Report name (In Japanese)極限環境状態における現象 低次元金属・超伝導の超異方性強磁場効果
Technology summary (In Japanese)本研究は強磁場下での低次元超伝導体の本性を解明し,その電磁応用の基礎を固め,新しい機能物質の開発を目指している。主な研究成果を以下に報告する。酸化物超伝導体Sr2RuO4の超伝導状態の研究から,超伝導をもたらす電子対が同じ方向のスピンを持つ三重項超伝導とよばれる新しいタイプであると分かった。電子構造も解明した。また,α-(ET)2NH4Hg(SCN)4やλ-(BETS)2GaCl4などの有機超伝導体の低温・強磁場極限下の特性を明らかにし,新たに超伝導量子揺らぎに基づくとみられる残留抵抗現象などを見出した。一方,層状超伝導体の層面に平行に磁場をかけたときの磁束状態を独自開発の測定法などによって調べ,磁束状態間の転移に関する理論を構築した。さらに,物質開発では,Sr2RuO4とRu金属の共晶系で超伝導転移温度が倍増する現象を見出したほか,新しい2次元Ru酸化物導体および錯体金属を数種開発した。
Research field
  • Electric conduction in semiconductors and insulators in general
  • Fundamental theory of superconductivity
  • Properties of oxide superconductors
  • Properties of organic superconductors
  • Bases, metal oxides
Published papers related (In Japanese)(1)Organic Superconductors in the pauli paramagnetic Limit Region, T. Ishiguro, Journal of Physics IV France 10, pr3-139-146(2000).
(2)Magnetoresistance of Sr2RuO4 under High Mgnetic Fields Paraller to the Superconducting plare, E. Ohmichi, Y. Maeno, S. Nagai, Z. Q, Mao, M. A. Tanator and T. Ishiguro, Physical Review B Vol 61(2000) pp.7101-7107.
(3) Suppression of Vortex pinning by Field Component Paraller to the Superconducting Plane in Bi2Sr2CaCu2O8, S. Nakahara, T. Ishiguro, S. Watauchi, J. Shimoyama and K.Kishio, Physical Review B vol61(2000) pp.3270-3273.
(4)In Plane Anisotropy of Upper Critical Field in Sr2RuO4, Z,QMao, Y. Maeno, T. Ando, T.Ishiguro, M.sigrist and T. Oguchi, Physical Review Letter Vol.84(2000) pp.991-994.
(5)Organic Superconductors Coming to their Estate, T. Ishiguro, Synthetic Metals,Vol.103 (1999) pp. 1595-1598
(6)Superconducting state κ-(ET)4Hg2.89Br8 under a Parallel Magnetic Field E. Ohmichi, Y. Shimojo, T. Ishiguro, T. Sakon, T. Sasaki and M. Motokawa, Journal of Superconductiorty. Vol.12(1999) pp.505-510.
(7)Antiferromagnetic Spin Resonance and Magnetic Phase Diagram of Deuterated κ-(BEDT-TTF)2Cu[N(CN)2]Br, H. Ito, T. Kondo, H. Sasaki, G. Saito and T. Ishiguro, Synthetic Metals, Vol. 103 (1999) pp. 1818-1819.
(8)Kosterlitz-Thouless-Like Transition in Organic Superconductor κ-(ET)4Hg2.89Br8, T. Kinoshita, T. Ishiguro, R.B. Lyubovskii and R.N. Lyubovskaya, Synthetic Metals, Vol. 103 (1999) pp. 1815-1816.
(9)Superconducting state of α-(ET)2NH4Hg(SCN)4 under Parallel Magnetic Field, Y. Shimojo, G, Ito, T. Ishiguro, T. Kondo and G. Journal of Superconductivity, Vol.12 (1999) pp.501-504.
(10)Enhancement of the Sum and Difference Frequencies in Shubnikov-de Haas Oscillation at Yamaji Angle in Layered Perovskite Sr2RuO4, E. Ohmichi, Y. Maeno and T. Ishiguro, Journal of the Physical Society of Japan, Vol. 68 (1999) pp. 24-27.
(11)Angle-Dependent Magnetoresistance Oscillation in the Layered Perovskite Sr2RuO4, E. Ohmichi, H. Adachi, Y. Maeno, T. Ishiguro and T. Oguchi, Physical Review B, Vol. 59 (1999) pp. 7263-7266.
(12)Spin-Gap in Perchlorate-Doped Trans-Polyacetylene, T. Masui, T. Ishiguro and J. Tsukamoto, Physical Review Letters, Vol. 82 (1999) pp. 2151-2154.
(13)Nonmetal to Metal Crossover and Ethylene Ordering in the Organic Superconductor κ-(BEDT-TTF)2Cu[N(CN)2]Br, M.A. Tanatar, T. Ishiguro, T. Kondo and G. Saito, Physical Review B, Vol.59 (1999) pp. 3841-3844.
(14)Intinsic Pinning of the Josephson Vorlex in a Two- Dimensional Superconductor Bi2Sr2CaCu2O8+8 studied via the conversion of Altrasonic to Electronic waves, H. Haneda, T. Ishiguro, S. Watauchi, J. Shimoyama and K. Kishio, Journal of the Physical society of Japan Vol. 67(1998) pp.1391-1400.
(15)Low-Temperature Magnetoresistance Anisotropy in (BDT-TTP)2SbF6, and (BDT-TTP)2AsF6 T. Nakada, T. Ishiguro, T. Miura, Y. Misaki, T. Yamabe and T. Mori, Journal of the Physical Society of Japan, Vol. 67 (1998) pp. 355-356.
Research project
  • Core Research for Evolutional Science and Technology;Phenomena of Extreme Conditions
Information research report
  • (In Japanese)石黒 武彦. 極限環境状態における現象 低次元金属・超伝導の超異方性強磁場効果. 戦略的基礎研究推進事業 平成10年度 研究年報,1999. p.460 - 464.

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