1995 Fiscal Year Annual Research Report

パルス状ミュオンを用いた固体物性の研究

Research Project

Project/Area Number	06302023
Research Institution	The University of Tokyo
Principal Investigator	永嶺謙忠東京大学, 理学部, 教授 (50010947)
Co-Investigator(Kenkyū-buntansha)	西田信彦東京工業大学, 理学部, 教授 (50126140) 鳥養映子山梨大学, 工学部, 助教授 (20188832) 目方守福井大学, 工学部, 教授 (80025345) 村山茂幸室蘭工業大学, 理学部, 助教授 (10157802) 都福仁大阪大学, 理学部, 教授 (10000837)
Keywords	ミュオン / ミュエスアール法 / 微視的磁性 / フラストレーション磁性 / 量子固体 / 半導体中の水素 / 重い電子系
Research Abstract	当科学研究費の助成を受けて、東京大学理学部中間子科学研究センターの高エネルギー物理学研究所分室のパルス状ミュオンファシリティを用いたμSR法による固体物性に関する実験研究に関して、次のような成果があがった。 1.重い電子系について村山(室蘭工大)グループは、単結晶Ce(Ru_<0.85>Rh_<0.15>)_2Si_2を用いて、反強磁性相におるSWD(スピン密度波)の存在を確かめた。都(大阪大)グループは、Ce_<1-x>La_xRu_2Si_2についてSWDを観測した。 2.フラストレーション磁性体について目方(福井大)グループはFeI_2について、田中(お茶水大)グループはLuFeMgO_4にいて、3番格子磁性体のスピンダイナミックスを調べた。伊藤(お茶水大)グループは、Mn_<0.55>Ag_<0.45>TiO_3,Fe_<0.25>Mg_<0.75>TiO_3についてクラスタースピングラス系のスピンダイナミックスを調べた。固体水素中のミュオン分子についてスピンのないパラ固体水素中の正ミュオンが2つの水素原子と結合してできる分子の特性を調べる実験が、西田(東工大)グループによって、H_2とD_2について行われ、特異な温度依存性を示すことが判った。 4.半金属中のミュオン状態について鳥養(山梨大)グループによって半金属Sb中の正ミュオンのスピン緩和が系統的に調べられ、特異な常磁性体状態をとることが判った。光照射下の半導体中のミュオン状態について Ge中の反磁性ミュオン状態が光励起伝導電子との相互作用によってスピン減偏極する様子が、門野(理研)グループによって詳細に測定された。超低速正ミュオンの発生と利用一次陽子ライン上に置かれた常温タングステン表面から発生する熱エネルギーミュオニウムをレーザーで共鳴解離させることにより超低速ミュオンを発生させる実験が、永嶺(東大中間子)グループによって進展した。すでに、100A厚の金にミュオンをとめ、ミュエスアール信号を見る実験が成功を見た。今後、表面科学への展開が期待される。

Research Products
(26 results)

All Other

All Publications (26 results)

[Publications] K. Nagamine: "Ultraslow Positive-Muon Generation by Laser Ioniation of Thermal Muonium from Hot Tungsten at Primarv Proton Beam" Physical Review Letters. 74. 4811-4814 (1995)
[Publications] K. Nagamine: "Construction of RIKEN-RAL Muon Facility at ISIS and Advanced μ SR" Hyperfine Interactions. 85. 1091 (1994)
[Publications] S. Murayama: "Zero-Field μ SR Study of CeRu2Si2 Heavy Fermion Compound" Hyperfine Interact. 85. 419-424 (1994)
[Publications] R. Kadono: "Muon Radiolysis in Alkali Halides" Hyperfine Interactions. 87. 979 (1994)
[Publications] N. Toyota: "Sero Field Muon Spin Relaxation Study of the Low Temperature State in α-(BEDT-TTf)_2KHg(SCN)_4" Physical Review Letters. 74. 3892 (1995)
[Publications] R. Kadono: "Quantum Diffusion of Muonium in GaAs with Shallow Donor Impurities" Hyperfine Interactions. 85. 79 (1994)
[Publications] C. Sekine: "Muon Spin Relaxation Studies in Single Crystals YRu_2Si_2 and Ce(Ru_<1-x>Rhx)_2Si_2" Physica. B206. 307 (1995)
[Publications] K. Nagamine: "Method of probing inner structure ofgeophsical substance with the horizontal cosmic-ray muons and possible application to volcanic eruption prediction" Nuclear Instruments and Methods in Physics Research. A356. 585 (1995)
[Publications] E. Torikai: "Interaction of Paramagnetic Electron with Supercurrent in High Tc superconductor LaSrCuo probed by (μ^-O) spin relaxation" Hyperfine Int.646. (1996)
[Publications] R. Kadono: "Relaxed Exited States and Anomalous Hyperfine Structure of Muonium Centers in KBr" Hyperfine Interactions. 84. 271 (1994)
[Publications] Y. Hosoi: "Non-destructive elemental analysis of vertebral body rabecular using muonic X-rays" The British Jourmal of Radiology. 68. 1325 (1995)
[Publications] Y. Miyake: "Laser system for the resonant ionization of hydrogen-like atoms produced by Nuclear reactions" Nuclear Instruments and methods in Physics Research. B95. 265 (1995)
[Publications] 水嶺謙忠: "夢の素粒子ビーム、超低速ミュオンの誕生" 丸文 MIA(Marubun Communication Media). 49.
[Publications] S. Kawarazaki: "Neutron Diffraction Study on the Magnetism of the Ce(Ru_<1-x>Rh_x)_2Si_2 Compound System" Physica B. 206,207. 298-300 (1995)
[Publications] R. Hamada: "Magnetic Properties of ErRu_2Si_2" J Magn. Magn. Mater. 140-144. 907-908 (1995)
[Publications] T. Takeuchi: "Magnetic Properties of ReRu_2Si_2(RE=Tb,Dy and Ho)" Phisica B. 206-207. 398-401 (1995)
[Publications] Y. Takeuchi: "Magnetic Phase Diagram of UNi_2Si_2 in H-T Space" Physica B. 201. 243-246 (1994)
[Publications] S. Kawarazaki: "Observation of the Singlet-Singlet Crystal Field Exctations in PrCu_2 by in Elastic Neutron Scattering" J Magn. Magn. Mater. (1995)
[Publications] M. Mekata: "Muonium Formation and Migration in CsMgCl_3" Hypertine Interactions. 84. 265-270 (1994)
[Publications] M. Tanaka: "μ SR studies of YFeMnO_4" Hyperfine Interactions. 00. 623 (1996)
[Publications] S. Kawarazaki: "Frozen-In Devils Staircase in U Mixed Compound System as Studied by Neutron Diffractions" J. Phys. Soc. Jpn. 63. 716 (1994)
[Publications] T. Kuwai: "Low Temperature Magnetic Properties of UAl_2" J. Phys. Soc. Jpn. 63. 3808 (1994)
[Publications] Y.Makoshi: "Diamagnetic Ordering of Inorganic Crystals and the Alignment of Interstella Dust Particles" J. Magn. Magn. Mater. 140-144. 2181-2182 (1995)
[Publications] K. Inoue: "High Field Magnetization of C14-Laves Phase RMn_2(R=Y, Gd, Tb, Dy nadYb)" J. Phys. Soc. Jpn. 64. 680-683 (1995)
[Publications] E. Torikai: "Spin Dynamics of the 2-dimentional Ferromagnetism in the Superlattice [MnSb/Sb]Proved by Positive Muon" Hyp. Interactions. 85. 151-157 (1994)
[Publications] S. B. Sulaiman: "Theory of the Location and associated hyperfine properties of positive muon in La_2CuO_4" Phys. Rev. B. 49. 9879-9884 (1994)

1995 Fiscal Year Annual Research Report

パルス状ミュオンを用いた固体物性の研究

Principal Investigator

永嶺 謙忠 東京大学, 理学部, 教授 (50010947)

Research Products

[Publications] K. Nagamine: "Ultraslow Positive-Muon Generation by Laser Ioniation of Thermal Muonium from Hot Tungsten at Primarv Proton Beam" Physical Review Letters. 74. 4811-4814 (1995)

[Publications] K. Nagamine: "Construction of RIKEN-RAL Muon Facility at ISIS and Advanced μ SR" Hyperfine Interactions. 85. 1091 (1994)

[Publications] S. Murayama: "Zero-Field μ SR Study of CeRu2Si2 Heavy Fermion Compound" Hyperfine Interact. 85. 419-424 (1994)

[Publications] R. Kadono: "Muon Radiolysis in Alkali Halides" Hyperfine Interactions. 87. 979 (1994)

[Publications] N. Toyota: "Sero Field Muon Spin Relaxation Study of the Low Temperature State in α-(BEDT-TTf)_2KHg(SCN)_4" Physical Review Letters. 74. 3892 (1995)

[Publications] R. Kadono: "Quantum Diffusion of Muonium in GaAs with Shallow Donor Impurities" Hyperfine Interactions. 85. 79 (1994)

[Publications] C. Sekine: "Muon Spin Relaxation Studies in Single Crystals YRu_2Si_2 and Ce(Ru_<1-x>Rhx)_2Si_2" Physica. B206. 307 (1995)

[Publications] K. Nagamine: "Method of probing inner structure ofgeophsical substance with the horizontal cosmic-ray muons and possible application to volcanic eruption prediction" Nuclear Instruments and Methods in Physics Research. A356. 585 (1995)

[Publications] E. Torikai: "Interaction of Paramagnetic Electron with Supercurrent in High Tc superconductor LaSrCuo probed by (μ^-O) spin relaxation" Hyperfine Int.646. (1996)

[Publications] R. Kadono: "Relaxed Exited States and Anomalous Hyperfine Structure of Muonium Centers in KBr" Hyperfine Interactions. 84. 271 (1994)

[Publications] Y. Hosoi: "Non-destructive elemental analysis of vertebral body rabecular using muonic X-rays" The British Jourmal of Radiology. 68. 1325 (1995)

[Publications] Y. Miyake: "Laser system for the resonant ionization of hydrogen-like atoms produced by Nuclear reactions" Nuclear Instruments and methods in Physics Research. B95. 265 (1995)

[Publications] 水嶺謙忠: "夢の素粒子ビーム、超低速ミュオンの誕生" 丸文 MIA(Marubun Communication Media). 49.

[Publications] S. Kawarazaki: "Neutron Diffraction Study on the Magnetism of the Ce(Ru_<1-x>Rh_x)_2Si_2 Compound System" Physica B. 206,207. 298-300 (1995)

[Publications] R. Hamada: "Magnetic Properties of ErRu_2Si_2" J Magn. Magn. Mater. 140-144. 907-908 (1995)

[Publications] T. Takeuchi: "Magnetic Properties of ReRu_2Si_2(RE=Tb,Dy and Ho)" Phisica B. 206-207. 398-401 (1995)

[Publications] Y. Takeuchi: "Magnetic Phase Diagram of UNi_2Si_2 in H-T Space" Physica B. 201. 243-246 (1994)

[Publications] S. Kawarazaki: "Observation of the Singlet-Singlet Crystal Field Exctations in PrCu_2 by in Elastic Neutron Scattering" J Magn. Magn. Mater. (1995)

[Publications] M. Mekata: "Muonium Formation and Migration in CsMgCl_3" Hypertine Interactions. 84. 265-270 (1994)

[Publications] M. Tanaka: "μ SR studies of YFeMnO_4" Hyperfine Interactions. 00. 623 (1996)

[Publications] S. Kawarazaki: "Frozen-In Devils Staircase in U Mixed Compound System as Studied by Neutron Diffractions" J. Phys. Soc. Jpn. 63. 716 (1994)

[Publications] T. Kuwai: "Low Temperature Magnetic Properties of UAl_2" J. Phys. Soc. Jpn. 63. 3808 (1994)

[Publications] Y.Makoshi: "Diamagnetic Ordering of Inorganic Crystals and the Alignment of Interstella Dust Particles" J. Magn. Magn. Mater. 140-144. 2181-2182 (1995)

[Publications] K. Inoue: "High Field Magnetization of C14-Laves Phase RMn_2(R=Y, Gd, Tb, Dy nadYb)" J. Phys. Soc. Jpn. 64. 680-683 (1995)

[Publications] E. Torikai: "Spin Dynamics of the 2-dimentional Ferromagnetism in the Superlattice [MnSb/Sb]Proved by Positive Muon" Hyp. Interactions. 85. 151-157 (1994)

[Publications] S. B. Sulaiman: "Theory of the Location and associated hyperfine properties of positive muon in La_2CuO_4" Phys. Rev. B. 49. 9879-9884 (1994)

永嶺謙忠東京大学, 理学部, 教授 (50010947)