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(In Japanese)低次元金属・超伝導の超異方性強磁場効果

Research report code R000000201
Posted date Sep 30, 2002
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)低次元金属・超伝導の超異方性強磁場効果
Technology summary (In Japanese)近年発展の著るしい超伝導について方位を制御した磁場下での物性を明らかにすると共に,電磁応用の基盤を固め,新しい機能物質を開発することを目的にしている。平成11年度は新しい超伝導状態を持つとみられるSr2RuO4について超伝導面に平行な磁場下において,上部臨界磁場付近で秩序パラメータの対称性が低下することを磁化率,比熱,熱伝導の測定により明らかにした(図1)。一方,代表的な二次元分子性超伝導体について面平行磁場下の超伝導相図を明らかにした。物質開発研究では新しいモット絶縁体と導電性透明分子膜を得た。
1)Sr2RuO4のスピン三重項超伝導状態,
2)二次元超伝導体の面平行磁場下の上部臨界磁場と磁束状態,
3)二次元金属Sr2RuO4(EO-TTP)2Xのフェルミ面,
4)低次元超伝導体の渦糸状態の理論,
5)低次元超伝導体におけるFFLO状態,
6)準二次元モット転移系の物性相図構築,
7)BEDO分子をポリカーボネート膜に導入した導電性透明膜
について>研究の概要を報告している。
Drawing

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R000000201_01SUM.gif
Research field
  • Properties of metallic superconductors
  • Properties of oxide superconductors
  • Superconducting magnets
  • Bases, metal oxides
  • Insulating materials
Published papers related (In Japanese)(1)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.
(2)Vortex Lock-in Phase Diagram in κ-(ET)2Cu[N(CN)2]Br and κ-(ET)2Cu(NCS)2, S. Nakaharai, T. Ishiguro, G. Saito, J. Yamada and Y. Anzai, Synthetic Metals Vol. 103 (1999) pp.1896-1897.
(3)Low Temperature Superstructure and Transfer Integrals in κ-(BEDT-TTF)2Cu[N(CN)2]X: X=Cl, Br M. Watanabe, Y. Nogami, K. Oshima, H. Ito, T. Ishiguro and G. Saito, Synthetic Metals Vol. 103 (1999) 1909-1910.
(4)Resistance Peak under a Magnetic Field Parallel to the Conducting Plane, E. Ohmichi, H. Adachi, Y. Maeno, T. Ishiguro, T. Komatsu and G. Saito, Synthetic Metals Vol. 103 (1999) pp.1912.
(5)Upper Critical Field of κ-(ET)4Hg2.89Br8 under a Parallel Magnetic Field, E. Ohmichi, Y. Shimojo, T. Ishiguro, T. Sakon, T. Sasaki and M. Motokawa, Synthetic Metals Vol. 103 (1999) pp.2107-2108.
(6)Spin Susceptibility and Its Relationship to Structure in Perchrolate Doped Polyacetylenein the Intermediate Dopant-Concentration Region, T. Masui, T. Ishiguro and J. Tsukamoto, Synthetic Metals Vol. 104 (1999) pp.179-188.
(7)Reentrant Superconductivity of the Deuterated Salt of κ-(BEDT-TF)2Cu[C(CN)2]Br under Pressure, H. Ito, T. Ishiguro, T. Kondo and G. Saito, Journal of the Physical Society of Japan Vol.69, No.1 (2000) pp.290-291.
(8)In-Plane Anisotropy of Upper Critical Field in Sr2RuO4, Z.Q. Mao, Y. Maeno, T. Ando, T. Ishiguro, M. Sigrist, and T. Oguchi, Physical Review Letters, Vol. 84 (2000) pp.991-994.
(9)Suppression of Vortex Pinning by Field Component Parallel to the Superconducting Plane in Bi2Sr2CaCu2O8, S. Nakaharai, T. Ishiguro, S. Watauchi, J. Shimoyama and K. Kishio, Physical Review B, Vol. 61 No.5 (2000) pp.3270-3273.
(10)ESR Study of the Ordering Transformation in κ-(BEDT-TTF)2Cu[N(CN)2]Br, M.A. Tanatar, T. Ishiguro, T. Kondo and G. Saito, Physical Review B, Vol. 61 No. 5 (2000) pp.3278-3281.
(11)Magnetoresistance of Sr2RuO4 under High Magnetic Fields Parallel to the Conducting Plane, E. Ohmichi, Y. Maeno, S, Nagai, Z.Q. Mao, M.A. Tanatar and T. Ishiguro, Physical Review B, Vol.61 No.10 (2000) pp.7101-7107.
(12)Organic Superconductors in the Pauli Paramagnetic Limit Region, T. Ishiguro, Journal de Physique IV, France Vol.10 (2000) Pr3-139-146.
(13)Evidence for Incommensurate Spin Fluctuations in Sr2RuO4, Y. Sidis, M. Braden, P. Bourges, B. Hennion, W. Reichardt, Y. Maeno and Y.Mori, Physical Review Letters, Vol. 83 (1999) pp.3320-3323.
(14)Specific Heat of the Spin Triplet Superconductor Sr2RuO4 under Magnetic Fields, S. Nishizaki, Z.Q. Mao and Y. Maeno, Journal of Physical Society of Japan, Vol. 69 (2000) pp.572-578.
(15)In-Plane Anisotropy of Upper Critical Field in Sr2RuO4, Z.Q. Mao, Y. Maeno, T. Ando, T. Ishiguro, M. Sigrist, and T. Oguchi, Physical Review Letters, Vol.84 (2000) pp.991-994.
(16)Detailed Topography of the Fermi Surface of Sr2RuO4, C. Bergemann, S.R. Julian, A.P. Mackenzie, S. Nishizaki and Y. Maeno, Physical Review Letters, Vol.84 (2000) pp.2662-2665.
(17)Quasi-Two-Dimensional Mott Transition System Ca2-xSrxRuO4, S. Nakatsuji and Y. Maeno, Physical Review Letters, Vol.84 (2000) pp.2666-2669.
Research project
  • Core Research for Evolutional Science and Technology;Phenomena of Extreme Conditions
Information research report
  • (In Japanese)石黒 武彦. 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11年度 研究年報.科学技術振興事業団, 2000. p.512 - 521.

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