1991 Fiscal Year Annual Research Report

高温超伝導体のフェルミ準位付近の電子構造

Research Project

Project/Area Number	03306005
Research Institution	Hiroshima University
Principal Investigator	藤田敏三広島大学, 理学部, 教授 (20004369)
Co-Investigator(Kenkyū-buntansha)	北岡良雄大阪大学, 基礎工学部, 助教授 (70110707) 佐藤正俊名古屋大学, 理学部, 教授 (40092225) 北沢宏一東京大学, 工学部, 教授 (90011189) 福山秀敏東京大学, 物性研究所, 教授 (10004441) 深瀬哲郎東北大学, 金属材料研究所, 教授 (90005900)
Keywords	高温超伝導 / Inーgap構造 / 超音波 / NMR / 中性子 / 角度分解型光電子分光 / ラマン分光 / 構造相転移
Research Abstract	本総合研究の第一の目的は、これまで築き上げてきた超伝導発現機構研究グル-プの情報交換の場を維持することである。このため、次の3つの研究討論会を開催し、本研究班のメンバ-以外の専門家にも参加してもらい、情報集収、現状把握、問題点の徹底討論を行った。 1.若手実験家研究交流会ー平成3年11月17〜19日、箱根・静雲荘。責任者:北岡。参加者:56名。9つのテ-マを選び討論と情報交換を行う。 2.「高温超伝導体のフェルミ準位付近の電子構造」理論研究会ー平成3年11月26〜28日、神奈川県足柄上郡・ハイツ&ヴィラなかがわ。責任者:福山。参加者:55名。電子状態(Inーgap構造,スピン励起など)、構造転移・局所歪・フォノン、電子状態・渦糸状態の理論モデル、計算機の有効性、模型の相互比較等を議論する。 3.公開研究会「高温超伝導の物理」ー平成4年1月8・9日、東大・山上会館。責任者:藤田。参加者:86名。高温超伝導の物理を研究する各グル-プの最近の成果を報告し、問題点の洗い出しと現状把握のため討論を行う。本総合研究の第二の目的は、高温超伝導体の電子状態の研究推進で、主なテ-マとして、良質の試料作成、構造相転移と電子状態、超音波・NMR・角度分解型光電子分光・ラマン分光・中性子によるフェルミ面付近の電子状態とフォノンの研究、電子状態の低次元性、電子構造および混合状態に関する理論を各メンバ-のグル-プで分担して、実験と理論の両面から追求した。その成果は、164編の論文として発表した。次ペ-ジ以降には、その中から代表的な論文を20編だけリストアップした。

Research Products
(20 results)

All Other

All Publications (20 results)

[Publications] Y.Maeno et al.(T.Fujita): "Effects of ThーDoping on Structural and Superconductive Properties of La_<2ーX>Ba_xCuO_4" Phys.Rev.B44. 7753-7756 (1991)
[Publications] T.Fujita et al.: "Ultrasonic Study on Anisotropic Elastic Properties of Oxide Superconductors" J.Advanced Science. 4. (1992)
[Publications] M.Oda et al.(M.Ido): "Electronic Properties of Doped Holes and Magnetic Properties in La_<2ーX>M_XCuO_4(M=Sr,Ba)" Physica. C183. 234-240 (1991)
[Publications] M.Ido et al.: "Pressure Effect on Superconductivity and LowーTemperature Phase Transition in Baーdoped La_2CuO_4" Physica. B185ー189. 911-912 (1991)
[Publications] T.Onozuka et al.(T.Fukase): "Structural Changes of BiSr(CaY)CuO Ceramics with Yttrium Content Studied by Electron Diffraction and HighーResolution Electron Microscopy" Phys.Rev.B43. 66-72 (1991)
[Publications] T.Goto et al.(T.Fukase): "Phase Transition below Tc in La_<2ーx>Sr_xCuO_4(x=0.12)observed by ^<138>LaーNQR." J.Phys.Soc.Jpn.60. 3581-3582 (1991)
[Publications] T.Watanabe et al.(T.Takahashi): "Inverse Fhotoemission Study of HoleーConcentration Dependence of the Electronic Structure in Bi_2Sr_2Ca_<1ーx>Y_xCu_2O_8(x=0.0ー0.5)" Phys.Rev.B44. 5316-5317 (1991)
[Publications] T.Takahashi et al.: "Comparative Photoemission Study of Rb_xC_<60'> Rb_xC_<70>and RbC_<8;> A Pseudogap at the Fermi Level in the Fulleride" Physica. C190. 205-209 (1992)
[Publications] T.Tanamoto et al.(H.Fukuyama): "Magnetic Properties of tーJ Model" J.Phys.Soc.Jpn.60. 3072-3092 (1991)
[Publications] H.Fukuyama et al: "TwoーDimensional Hubbard Model at Low Electron Density" J.Phys.Soc.Jpn.60. 2013-2030 (1991)
[Publications] T.Tamegai and Y.Iye: "Universal Transport Anomaly in the 1ー2ー3 System with Reduced Carrier Density" Phys.Rev.B44. 10167-10172 (1991)
[Publications] Y.Iye et al.: "Intrinsic Pinning and Disspation at High Current Density in Epitaxial Thin Films of YBa_2Cu_3O_<7ーy>" Physica. C184. 362-370 (1991)
[Publications] T.Hasegawa et al.(K.Kitazawa): "Cryogenic Scanning Tunneling Microscopy and Spectroscopy on the Cleaved Surface of BiーSrーCaーCuーO down to 4.2 K" Jpn.J.Appl.Phys.30. L276-L279 (1991)
[Publications] T.Shibauchi et al.(K.Kitazawa): "Electromagnetic Response of Superconducting Bi_2(Sr,Ca) _3Cu_2O_y" Physica. C185ー189. 1851-1852 (1991)
[Publications] P.Gehring et al.(M.Sato): "Magnetic Correlations and Energy Gap in Superconducting YBa_2Cu_3O_<6.6> with Tc=53 K" Phys.Rev.B44. 2811-2817 (1991)
[Publications] M.Sato et al.: "On the Mechanism of the Structural Transition to the Low Temperature Tetragonal Phase in La_<2ーx>Ba_xCuO_4" Physica. C185ー189. 905-906 (1991)
[Publications] Y.Kitaoka et al.: "Spin Dynamics in HeavilyーDoped HighーTc Superconductors Tl_2Ba_2CuO_<6+y>" Physica. C179. 107-118 (1991)
[Publications] Y.Kitaoka et al.: "NMR in HighーTc Oxide Superconductors" Physica. C185ー189. 98-103 (1991)
[Publications] S.Sugai and Y.Hidaka: "Cerium doping and Oxygen Reduction Effects on Magnons and Phonons in Nd_<2ーx>Ce_xCuO_<4ーy>" Phys.Rev.B44. 809-813 (1991)
[Publications] S.Sugai: "Local Distortion specifying the Superconductor Phases observed by Raman Scattering" Physica. C185ー189. 76-79 (1991)

1991 Fiscal Year Annual Research Report

高温超伝導体のフェルミ準位付近の電子構造

Principal Investigator

藤田 敏三 広島大学, 理学部, 教授 (20004369)

Research Products

[Publications] Y.Maeno et al.(T.Fujita): "Effects of ThーDoping on Structural and Superconductive Properties of La_<2ーX>Ba_xCuO_4" Phys.Rev.B44. 7753-7756 (1991)

[Publications] T.Fujita et al.: "Ultrasonic Study on Anisotropic Elastic Properties of Oxide Superconductors" J.Advanced Science. 4. (1992)

[Publications] M.Oda et al.(M.Ido): "Electronic Properties of Doped Holes and Magnetic Properties in La_<2ーX>M_XCuO_4(M=Sr,Ba)" Physica. C183. 234-240 (1991)

[Publications] M.Ido et al.: "Pressure Effect on Superconductivity and LowーTemperature Phase Transition in Baーdoped La_2CuO_4" Physica. B185ー189. 911-912 (1991)

[Publications] T.Onozuka et al.(T.Fukase): "Structural Changes of BiSr(CaY)CuO Ceramics with Yttrium Content Studied by Electron Diffraction and HighーResolution Electron Microscopy" Phys.Rev.B43. 66-72 (1991)

[Publications] T.Goto et al.(T.Fukase): "Phase Transition below Tc in La_<2ーx>Sr_xCuO_4(x=0.12)observed by ^<138>LaーNQR." J.Phys.Soc.Jpn.60. 3581-3582 (1991)

[Publications] T.Watanabe et al.(T.Takahashi): "Inverse Fhotoemission Study of HoleーConcentration Dependence of the Electronic Structure in Bi_2Sr_2Ca_<1ーx>Y_xCu_2O_8(x=0.0ー0.5)" Phys.Rev.B44. 5316-5317 (1991)

[Publications] T.Takahashi et al.: "Comparative Photoemission Study of Rb_xC_<60'> Rb_xC_<70>and RbC_<8;> A Pseudogap at the Fermi Level in the Fulleride" Physica. C190. 205-209 (1992)

[Publications] T.Tanamoto et al.(H.Fukuyama): "Magnetic Properties of tーJ Model" J.Phys.Soc.Jpn.60. 3072-3092 (1991)

[Publications] H.Fukuyama et al: "TwoーDimensional Hubbard Model at Low Electron Density" J.Phys.Soc.Jpn.60. 2013-2030 (1991)

[Publications] T.Tamegai and Y.Iye: "Universal Transport Anomaly in the 1ー2ー3 System with Reduced Carrier Density" Phys.Rev.B44. 10167-10172 (1991)

[Publications] Y.Iye et al.: "Intrinsic Pinning and Disspation at High Current Density in Epitaxial Thin Films of YBa_2Cu_3O_<7ーy>" Physica. C184. 362-370 (1991)

[Publications] T.Hasegawa et al.(K.Kitazawa): "Cryogenic Scanning Tunneling Microscopy and Spectroscopy on the Cleaved Surface of BiーSrーCaーCuーO down to 4.2 K" Jpn.J.Appl.Phys.30. L276-L279 (1991)

[Publications] T.Shibauchi et al.(K.Kitazawa): "Electromagnetic Response of Superconducting Bi_2(Sr,Ca) _3Cu_2O_y" Physica. C185ー189. 1851-1852 (1991)

[Publications] P.Gehring et al.(M.Sato): "Magnetic Correlations and Energy Gap in Superconducting YBa_2Cu_3O_<6.6> with Tc=53 K" Phys.Rev.B44. 2811-2817 (1991)

[Publications] M.Sato et al.: "On the Mechanism of the Structural Transition to the Low Temperature Tetragonal Phase in La_<2ーx>Ba_xCuO_4" Physica. C185ー189. 905-906 (1991)

[Publications] Y.Kitaoka et al.: "Spin Dynamics in HeavilyーDoped HighーTc Superconductors Tl_2Ba_2CuO_<6+y>" Physica. C179. 107-118 (1991)

[Publications] Y.Kitaoka et al.: "NMR in HighーTc Oxide Superconductors" Physica. C185ー189. 98-103 (1991)

[Publications] S.Sugai and Y.Hidaka: "Cerium doping and Oxygen Reduction Effects on Magnons and Phonons in Nd_<2ーx>Ce_xCuO_<4ーy>" Phys.Rev.B44. 809-813 (1991)

[Publications] S.Sugai: "Local Distortion specifying the Superconductor Phases observed by Raman Scattering" Physica. C185ー189. 76-79 (1991)

藤田敏三広島大学, 理学部, 教授 (20004369)