1992 年度実績報告書

高温超伝導の科学:総括班

研究課題

研究課題/領域番号	04240101
研究機関	東北大学
研究代表者	立木昌東北大学, 金属材料研究所, 教授 (20028111)
研究分担者	藤田敏三広島大学, 理学部, 教授 (20004369) 北沢宏一東京大学, 工学部, 教授 (90011189) 佐藤正俊名古屋大学, 理学部, 教授 (40092225) 坂東尚周京都大学, 化学研究所, 教授 (70027027) 福山秀敏東京大学, 理学部, 教授 (10004441)
キーワード	高温超伝導 / ニュースレター / ミニ研究会 / 磁気励起 / 単結晶 / 国際交流
研究概要	本総括班は、重点領域研究「高温超伝導の科学」の各班の活発な研究活動を促すとともに、プロジェクト研究としての目標達成のために、次のような活動を行った。特に、総括班主導の重点課題研究の推進と、重要テーマに焦点を絞ったブレーンストーミング的なミニ研究会の開催を2本の柱にして、本領域の研究の基本的な方向付けを行ってきた。 (1)総括班会議を4回開催:年間スケジュールの決定、各班の活動の把握、国内外の研究に関する情報収集、その他領域運営に関する問題点の点検と把握、(2)ニュースレターの発行(2回):1号-各班の研究方針、研究組織表と連絡先(住所録)、研究開始状況、その他連絡事項。2号-ミニ研究会の報告を中心にした活動状況(3)重点課題の研究促進:本年度は次の4テーマに絞って、総括班が中心となって研究環境の整備を行い研究の促進を図った。(1)良質な担結晶資料の作成(兒嶋担当)、(2)NMRによる高温超伝導体の磁気励起の研究(安岡担当)、(3)高温超伝導体における巨大磁歪の異方性測定(北沢担当)、(4)新超伝導体探索のための磁化測定(庄野担当)、(5)酸化物高温超伝導体の混合状態の異常を解明するためのシミュレーション(立木担当)、(4)ミニ研究会開催:総括班主催のトピックス別ミニ研究会を8回開催し、実質的な討論を行った。他にA02班・A05班合同、A01班、A03班などの各班別の合宿形式研究会をサポートした(5)研究成果発表会:1月11〜13日に野口英世記念開館(東京)において、公開で研究発表会を開催し、計95件の報告があった。(6)研究連絡網の強化:総括班メンバーを中心に連絡を密にするとともに、仙台〜広島間のデータ転送コンピュータネットを整備した。(7)国際研究交流:個別交流の他、「強相関系の日露ワークショップ」(堺、12月)に総括班から2名を派遣し、情報交換を行った。

研究成果

(27件)

すべてその他

すべて文献書誌 (27件)

[文献書誌] M.Tachiki: "Effect of intrinsic pinning on critical current in cuprate superconductors" Cryogenics. 32. 923-930 (1992)
[文献書誌] M.Tachiki: "Superconducting properties of layered cuprate oxides" Prog.Theor.Phys.Suppl.108. 297-311 (1992)
[文献書誌] M.Sasaki: "Electronic states of high-Tc cuprate superconductors as studied by the use of the composite-operator approach" Phys.Rev.B. 46. 3022-3040 (1992)
[文献書誌] T.Tanamoto: "Fermi surface and spin fluctuations in extended t-J model" J.Phys.Soc.Japan. 61. 1886-1890 (1992)
[文献書誌] T.Tanamoto: "Magnetic properties of extended t-J model. I. Static properties" J.Phys.Soc.Japan. 62. 717-730 (1993)
[文献書誌] H.Fukuyama: "On magnetic properties of high Tc oxides" Prog.Theor.Phys.Suppl.108. 287-295 (1992)
[文献書誌] M.Azuma: "Superconductivity at 110k in the infinite-layer compound (Sr_<1-x>Ca_x)_<1-y>CuO_2" Nature. 356. 775-776 (1992)
[文献書誌] Y.Matsuda: "Disappcarance of hall resistance in one-unit-cell-thick YBa_2Cu_3O_<7-δ> Evidence of free vortex-antivortex excitation" Phys.Rev.Left.69. 3228-3231 (1992)
[文献書誌] T.Nishizaki: "Lorentz-force dependence of transport critical currents anisotropic pinning properties in YBa_2Cu_3O_<7-δ> single-crystalline thin films" Physica C. 204. 305-314 (1993)
[文献書誌] M.Sato: "Magnetic excitations in superocnducting YBa_2Cu_3O_<6+x> crystals studied by neutron inelastic scattering" J.Phys.Soc.Jpn.62. 263-273 (1993)
[文献書誌] M.Sera: "Substitution effects on the thermoelectric power of La_<2-x>Sr_xCu_<1-y>M_yO_4(M=Z_n and Ni)and YBa_2Cu_<3-y>Zn_yO_<7-δ>" J.Phys.Soc.Jpn. 62. 281-288 (1993)
[文献書誌] T.Nishikawa: "Hole density dependence of the low temperature electronic specific heat coefficient of La_<2-x>Sr_xCaCu_2O_6 with weakly localized electrons" Physica C.
[文献書誌] T.Hasegawa: "Atomic site tunneling spectroscopy on oxide superconductors" J.Phys.Chem.Solids. 53. 1643-1650 (1992)
[文献書誌] H.Ikuta: "Giant magnetostriciton in Bi_2Sr_2CaCu_<>O_8 single crystal in the superconducting state and its mechanism" Phys.Rev.Lett.
[文献書誌] T.Nagano: "Bulk superconductivity in both tetragonal and orthorhombic solid solutions of (La_<1-x>Sr_x)_2Cu)_4" Phys.Rev.B.
[文献書誌] T.Kusumori: "Fabrication of YBCO/CeO_2/YBCO multilayer junctions and their characteristics" Jpn.J.Appl.Phys.31. L956-L959 (1992)
[文献書誌] I.Iguchi: "Tunnel-like characteristics of YBa_2Cu_3O_<7-y>/CeO_2/YBa_2Cu_3O_<7-y> junctions and possible evidence of excitations responsible for high-Tc superconductivity" Phys.Rev.B. 46. 11175-11178 (1992)
[文献書誌] I.Iguchi: "Tunnel,Josephson and proximity effects in high Tc multilayers" Proceeding of Beijing International Conference on High Tc superocnductivity(BHTSC'92).
[文献書誌] Y.Maeno: "Instability at 1/8 doping in La_<2-x>Ba_xCuO_4 and related compounds" Jpn.J.Appl.Phys.Series 7. 7. 91-98 (1992)
[文献書誌] T.Fujita: "Ultrasonic study on anisotropic elastic properties of oxide superconductors" J.Advanced Science. 4. 131-134 (1992)
[文献書誌] M.Lang: "Lattice instabilities in cuprate superconductors : A possible limitting mechanism for Tc" Phys.Rev.Lett.69. 482-485 (1992)
[文献書誌] Y.Sakaguchi: "Shock-loading effects on flux pinning of the high Tc superconductor La_<1.85>Sr_<0.15>CuO_4" Physica C. 201. 183-188 (1992)
[文献書誌] H.Yamaguchi: "X-ray absorption study of PbBaSrYCuO_<7+δ> and PbBaSr (Y,Ca)Cu_2O_<7+δ>" Ferroelectrics. 128. 191-196 (1992)
[文献書誌] Y.Muraoka: "Structural and superconducting properties of iodine in tercalated Bi_2Sr_2Ca_<1-x>Y_xCu_2O_z" Physica C. 204. 65-70 (1993)
[文献書誌] Y.Tokura: "Filling dependence of electronic properties on the verge of metal-Mott insulator transition in Sr_<1-x>La_xTiO_3" Phys.Rev.Lett.
[文献書誌] T.Arima: "Optical spectra of Pr_<2-x>Ce_xCuO_<4-δ> crystals: Evolution of ingap states with electron-doping" Phys.Rev.B.
[文献書誌] T.Katsufuji: "Symmetry-dependent electronic Raman scattering in La_<2-x>Sr_xCuO_4: Evidence for doping-induced change in K-space anisotropy of charge dynamics" Phys.Rev.Lett.

1992 年度 実績報告書

高温超伝導の科学:総括班

研究代表者

立木 昌 東北大学, 金属材料研究所, 教授 (20028111)

研究成果

[文献書誌] M.Tachiki: "Effect of intrinsic pinning on critical current in cuprate superconductors" Cryogenics. 32. 923-930 (1992)

[文献書誌] M.Tachiki: "Superconducting properties of layered cuprate oxides" Prog.Theor.Phys.Suppl.108. 297-311 (1992)

[文献書誌] M.Sasaki: "Electronic states of high-Tc cuprate superconductors as studied by the use of the composite-operator approach" Phys.Rev.B. 46. 3022-3040 (1992)

[文献書誌] T.Tanamoto: "Fermi surface and spin fluctuations in extended t-J model" J.Phys.Soc.Japan. 61. 1886-1890 (1992)

[文献書誌] T.Tanamoto: "Magnetic properties of extended t-J model. I. Static properties" J.Phys.Soc.Japan. 62. 717-730 (1993)

[文献書誌] H.Fukuyama: "On magnetic properties of high Tc oxides" Prog.Theor.Phys.Suppl.108. 287-295 (1992)

[文献書誌] M.Azuma: "Superconductivity at 110k in the infinite-layer compound (Sr_<1-x>Ca_x)_<1-y>CuO_2" Nature. 356. 775-776 (1992)

[文献書誌] Y.Matsuda: "Disappcarance of hall resistance in one-unit-cell-thick YBa_2Cu_3O_<7-δ> Evidence of free vortex-antivortex excitation" Phys.Rev.Left.69. 3228-3231 (1992)

[文献書誌] T.Nishizaki: "Lorentz-force dependence of transport critical currents anisotropic pinning properties in YBa_2Cu_3O_<7-δ> single-crystalline thin films" Physica C. 204. 305-314 (1993)

[文献書誌] M.Sato: "Magnetic excitations in superocnducting YBa_2Cu_3O_<6+x> crystals studied by neutron inelastic scattering" J.Phys.Soc.Jpn.62. 263-273 (1993)

[文献書誌] M.Sera: "Substitution effects on the thermoelectric power of La_<2-x>Sr_xCu_<1-y>M_yO_4(M=Z_n and Ni)and YBa_2Cu_<3-y>Zn_yO_<7-δ>" J.Phys.Soc.Jpn. 62. 281-288 (1993)

[文献書誌] T.Nishikawa: "Hole density dependence of the low temperature electronic specific heat coefficient of La_<2-x>Sr_xCaCu_2O_6 with weakly localized electrons" Physica C.

[文献書誌] T.Hasegawa: "Atomic site tunneling spectroscopy on oxide superconductors" J.Phys.Chem.Solids. 53. 1643-1650 (1992)

[文献書誌] H.Ikuta: "Giant magnetostriciton in Bi_2Sr_2CaCu_<>O_8 single crystal in the superconducting state and its mechanism" Phys.Rev.Lett.

[文献書誌] T.Nagano: "Bulk superconductivity in both tetragonal and orthorhombic solid solutions of (La_<1-x>Sr_x)_2Cu)_4" Phys.Rev.B.

[文献書誌] T.Kusumori: "Fabrication of YBCO/CeO_2/YBCO multilayer junctions and their characteristics" Jpn.J.Appl.Phys.31. L956-L959 (1992)

[文献書誌] I.Iguchi: "Tunnel-like characteristics of YBa_2Cu_3O_<7-y>/CeO_2/YBa_2Cu_3O_<7-y> junctions and possible evidence of excitations responsible for high-Tc superconductivity" Phys.Rev.B. 46. 11175-11178 (1992)

[文献書誌] I.Iguchi: "Tunnel,Josephson and proximity effects in high Tc multilayers" Proceeding of Beijing International Conference on High Tc superocnductivity(BHTSC'92).

[文献書誌] Y.Maeno: "Instability at 1/8 doping in La_<2-x>Ba_xCuO_4 and related compounds" Jpn.J.Appl.Phys.Series 7. 7. 91-98 (1992)

[文献書誌] T.Fujita: "Ultrasonic study on anisotropic elastic properties of oxide superconductors" J.Advanced Science. 4. 131-134 (1992)

[文献書誌] M.Lang: "Lattice instabilities in cuprate superconductors : A possible limitting mechanism for Tc" Phys.Rev.Lett.69. 482-485 (1992)

[文献書誌] Y.Sakaguchi: "Shock-loading effects on flux pinning of the high Tc superconductor La_<1.85>Sr_<0.15>CuO_4" Physica C. 201. 183-188 (1992)

[文献書誌] H.Yamaguchi: "X-ray absorption study of PbBaSrYCuO_<7+δ> and PbBaSr (Y,Ca)Cu_2O_<7+δ>" Ferroelectrics. 128. 191-196 (1992)

[文献書誌] Y.Muraoka: "Structural and superconducting properties of iodine in tercalated Bi_2Sr_2Ca_<1-x>Y_xCu_2O_z" Physica C. 204. 65-70 (1993)

[文献書誌] Y.Tokura: "Filling dependence of electronic properties on the verge of metal-Mott insulator transition in Sr_<1-x>La_xTiO_3" Phys.Rev.Lett.

[文献書誌] T.Arima: "Optical spectra of Pr_<2-x>Ce_xCuO_<4-δ> crystals: Evolution of ingap states with electron-doping" Phys.Rev.B.

[文献書誌] T.Katsufuji: "Symmetry-dependent electronic Raman scattering in La_<2-x>Sr_xCuO_4: Evidence for doping-induced change in K-space anisotropy of charge dynamics" Phys.Rev.Lett.

1992 年度実績報告書

立木昌東北大学, 金属材料研究所, 教授 (20028111)