1989 Fiscal Year Annual Research Report

準結晶の物性に関する研究

Research Project

Project/Area Number	01630003
Research Institution	The University of Tokyo
Principal Investigator	竹内伸東京大学, 物性研究所, 教授 (60013512)
Co-Investigator(Kenkyū-buntansha)	二宮敏行東京大学, 理学部, 教授 (90011460) 大嶋隆一郎大阪大学, 基礎工学部, 助教授 (50029469) 井野博満東京大学, 工学部, 教授 (20029466) 深道和明東北大学, 工学部, 教授 (00005969) 水谷宇一郎名古屋大学, 工学部, 教授 (00072679)
Keywords	準結晶 / 電子状態 / 電気抵抗 / 磁性 / メスバウア分光 / NMR / フィボナッチ超格子 / 蛍光
Research Abstract	1.電子物性:多数のsp電子系準結晶合金について、電気抵抗、電子比熱の測定を系統的に行った結果、状態密度にpseudogapが存在し、e/a=2.1のときにフェルミレベルがギャップの所に位置し、準結晶が安定化して電気抵抗が著しく大きくなることが明らかになった。安定相の電気抵抗の温度依存性には電子の弱局在の効果が顕著である。また、準結晶は欠陥が少いほど電気抵抗が大きく結晶と対照的であることも分った。 2.マクロ磁性:AlーCuーMn系準結晶の磁性に関する研究を行い、従来のAlーMn系の場合と異なり、アモルファス状態のMnの有効磁気モーメントが準結晶に比べて非常に大きく、モーメントを持つサイトが準結晶ではMn濃度に強く依存することが明らかになった。Mnを他の遷移金属で置換した効果も調べられた。 3.微現的磁性:AlーMnーSiーRu4元系の準結晶および結晶相は、巨視的磁性に関しては両者に大きな差が無いにもかかわらず、NMR測定により伝導電子を介してAl核におよぼす内部磁場の大きさには著しい差のあることが明らかになった。また、安定相準結晶Al_<65>Cu_<20>Fe_<15>の^<57>Feメスバウアスペクトルの温度依存性、熱処理依存性、メカニカルグラインディングによるアモルファス相への変化のようすなどを観測し、準結晶中では特に^<57>Fe核位置の電場勾配の値が電荷密度と大きな相関が見られた。 4.励起状態の伝播:GaAs-AlAsフィボナッチ超格子中の励起電子のふるまいを蛍光の発光スペクトルおよび蛍光の減衰で調べ、低いエネルギー状態に励起された電子は4Kで動けなくなるが、高いエネルギー状態に励起された電子の50%ぐらいは、ピコ秒ぐらいの間に試料の端まで動くことなどを見出した。 5.その他:AlーFeーCu中のフェイゾン歪の性質およびその焼鈍過程を明らかにした。AlーRuーCu準結晶の高温変形に関する研究を行った。

Research Products
(23 results)

All Other

All Publications (23 results)

[Publications] 竹内伸: "準結晶合金" 新素材レビュー'89. 3. 136-140 (1989)
[Publications] K.Kimura: "Electronic Properties of the Single-Grained Icosahedral Phase of Al-Li-Cu" Journal of the Physical Society of Japan. 58. 2472-2481 (1989)
[Publications] T.Tei: "Packing Characteristics of Atomic Structures of Model Icosahedral Phases" Japanese Journal of Applied Physics. 28. 1893-1899 (1989)
[Publications] K.Kimura: "Preparation and Susceptibility study of Al-Si-Mn-Transition Element Quaternary Quasicrytals" MRS Intern.Meeting on Advanced Materials,Vol.3. 3. 297-302 (1989)
[Publications] T.Tei: "A Realistic Model Structure of Frank-Kasper-Type Icosahedral Quasicrystals" Journal of the Physical Society of Japan. 59. (1990)
[Publications] K.Kishi: "A Systematic Change of Electrical Resistivity in Al_5(Mg_xLi_<1-x>)_<3.5-4>Cu_1 Icosahedral Quasicrystals" Journal of the Physical Society of Japan. 59. (1990)
[Publications] T.Shibuya: "Plastic Deformation of Al-Ru-Cu Icosahedral Quasicrystal" Japanese Journal Applied Physics. 29. (1990)
[Publications] T.Matsuda: "Electrical Properties for Icosahedral and Amorphous Phases in the Mg-Zn-Al Alloy System" Journal of Physics:Condensed Matter. 1. 4087-4098 (1989)
[Publications] U.Mizutani: "Electronic Properties of Icosahedral Quasicrystals in Mg-Al-Ag,Mg-Al-Cu and Mg-Zu-Ga Alloy Systems" Journal of Physics:Condensed Matter.
[Publications] U.Mizutani: "Electron Transport Properties of Thermodynamically Stable Al-Cu-Ru Icosahedral Quasicrystal" Journal of Physics:Condensed Matter.
[Publications] K.Fukamichi: "Comparison of Magnetic Electrical Properties in Amorphous,Quasicrystalline and Crystalline States of Al-Mn Alloys" Science Reports of Research Institute of Tohoku University. A34. 267-287 (1989)
[Publications] T.Goto: "Susceptibility and High Field Magnetization of Al-Mn Quasicrystalline and Amorphous Alloys" Journal Physical Society of Japan. 57. 1751-1757 (1988)
[Publications] K.Fukamichi: "Magnetic Properties of AlCuTM(TM:Transition Metal)Quasicrystals" Journal de Physique. 49ーC8. 239-240 (1988)
[Publications] H.Fujimaki: "Magnetic and NMR Studies of Quasicrystalline Al-Mn-Si-Ru Alloy" Journal Physical Society of Japan.
[Publications] T.Sugawara: "Crystallographic Texture of Melt-Spun Al-Mn Based and Al-Li-Cu Icosahedral Quasicrystals" Scripta Metallurgica. 23. 711-716 (1989)
[Publications] K.Oda: "EXAFS Study of Quasicrystalline Al-Mn Alloys Containing Fe,V and Si" MRS Intern.Meeting on Advanced Materials,Vol.3. 3. 353-358 (1989)
[Publications] 枝川圭一: "液体急冷Al基準結晶のPhason歪に関する研究" 東京大学工学部紀要A. 27. 54-55 (1989)
[Publications] 枝川圭一: "液体急冷Al基準結晶の位相子歪" 日本金属学会誌. 53. 1282-1283 (1989)
[Publications] K.Edagawa: "X-ray Study of Phason Strain in Al-Based Quasicrystals" Philosophical Magazine Letters.
[Publications] A.Waseda: "Effect of Heat Treatment on the X-ray Diffraction of Al-Cu-Fe Quasicrystal" Philosophical Magazine Letters.
[Publications] S.Nasu: "^<57>Fe Mossbauer Study on Mixing and Kneading of Metallic Powders" Hyperfine Interactions. (1989)
[Publications] A.A.Yamaguchi: "Transport Properties of Photoexcited Carriers in a Fibonacci Superlattice" Solid State Communication.
[Publications] T.Ninomiya: "Structural Features of Quasicrystals and their Electronic Properties for 2-D and 3-D Cases" Journal of Non-crystalline Solids(Proc.7th Int.Conf.on Liquid and Amorphous Metals,1989,Kyoto).

1989 Fiscal Year Annual Research Report

準結晶の物性に関する研究

Principal Investigator

竹内 伸 東京大学, 物性研究所, 教授 (60013512)

Research Products

[Publications] 竹内伸: "準結晶合金" 新素材レビュー'89. 3. 136-140 (1989)

[Publications] K.Kimura: "Electronic Properties of the Single-Grained Icosahedral Phase of Al-Li-Cu" Journal of the Physical Society of Japan. 58. 2472-2481 (1989)

[Publications] T.Tei: "Packing Characteristics of Atomic Structures of Model Icosahedral Phases" Japanese Journal of Applied Physics. 28. 1893-1899 (1989)

[Publications] K.Kimura: "Preparation and Susceptibility study of Al-Si-Mn-Transition Element Quaternary Quasicrytals" MRS Intern.Meeting on Advanced Materials,Vol.3. 3. 297-302 (1989)

[Publications] T.Tei: "A Realistic Model Structure of Frank-Kasper-Type Icosahedral Quasicrystals" Journal of the Physical Society of Japan. 59. (1990)

[Publications] K.Kishi: "A Systematic Change of Electrical Resistivity in Al_5(Mg_xLi_<1-x>)_<3.5-4>Cu_1 Icosahedral Quasicrystals" Journal of the Physical Society of Japan. 59. (1990)

[Publications] T.Shibuya: "Plastic Deformation of Al-Ru-Cu Icosahedral Quasicrystal" Japanese Journal Applied Physics. 29. (1990)

[Publications] T.Matsuda: "Electrical Properties for Icosahedral and Amorphous Phases in the Mg-Zn-Al Alloy System" Journal of Physics:Condensed Matter. 1. 4087-4098 (1989)

[Publications] U.Mizutani: "Electronic Properties of Icosahedral Quasicrystals in Mg-Al-Ag,Mg-Al-Cu and Mg-Zu-Ga Alloy Systems" Journal of Physics:Condensed Matter.

[Publications] U.Mizutani: "Electron Transport Properties of Thermodynamically Stable Al-Cu-Ru Icosahedral Quasicrystal" Journal of Physics:Condensed Matter.

[Publications] K.Fukamichi: "Comparison of Magnetic Electrical Properties in Amorphous,Quasicrystalline and Crystalline States of Al-Mn Alloys" Science Reports of Research Institute of Tohoku University. A34. 267-287 (1989)

[Publications] T.Goto: "Susceptibility and High Field Magnetization of Al-Mn Quasicrystalline and Amorphous Alloys" Journal Physical Society of Japan. 57. 1751-1757 (1988)

[Publications] K.Fukamichi: "Magnetic Properties of AlCuTM(TM:Transition Metal)Quasicrystals" Journal de Physique. 49ーC8. 239-240 (1988)

[Publications] H.Fujimaki: "Magnetic and NMR Studies of Quasicrystalline Al-Mn-Si-Ru Alloy" Journal Physical Society of Japan.

[Publications] T.Sugawara: "Crystallographic Texture of Melt-Spun Al-Mn Based and Al-Li-Cu Icosahedral Quasicrystals" Scripta Metallurgica. 23. 711-716 (1989)

[Publications] K.Oda: "EXAFS Study of Quasicrystalline Al-Mn Alloys Containing Fe,V and Si" MRS Intern.Meeting on Advanced Materials,Vol.3. 3. 353-358 (1989)

[Publications] 枝川圭一: "液体急冷Al基準結晶のPhason歪に関する研究" 東京大学工学部紀要A. 27. 54-55 (1989)

[Publications] 枝川圭一: "液体急冷Al基準結晶の位相子歪" 日本金属学会誌. 53. 1282-1283 (1989)

[Publications] K.Edagawa: "X-ray Study of Phason Strain in Al-Based Quasicrystals" Philosophical Magazine Letters.

[Publications] A.Waseda: "Effect of Heat Treatment on the X-ray Diffraction of Al-Cu-Fe Quasicrystal" Philosophical Magazine Letters.

[Publications] S.Nasu: "^<57>Fe Mossbauer Study on Mixing and Kneading of Metallic Powders" Hyperfine Interactions. (1989)

[Publications] A.A.Yamaguchi: "Transport Properties of Photoexcited Carriers in a Fibonacci Superlattice" Solid State Communication.

[Publications] T.Ninomiya: "Structural Features of Quasicrystals and their Electronic Properties for 2-D and 3-D Cases" Journal of Non-crystalline Solids(Proc.7th Int.Conf.on Liquid and Amorphous Metals,1989,Kyoto).

竹内伸東京大学, 物性研究所, 教授 (60013512)