1994 Fiscal Year Annual Research Report

酸化物系の相転移,光誘起秩序状態と超伝導共役性光応答のダイナミクスの研究

Research Project

Project/Area Number	06402023
Research Category	Grant-in-Aid for General Scientific Research (A)
Research Institution	Gunma University
Principal Investigator	眞隅泰三群馬大学, 工学部, 教授 (20012304)
Co-Investigator(Kenkyū-buntansha)	南英俊筑波大学, 物理工学系, 講師 (00190702) 伊藤文武群馬大学, 工学部, 教授 (60005907)
Keywords	酸化物系絶縁体 / 相転移 / 光伝導の異常 / 超伝導共役性 / 光誘起秩序状態 / 超伝導オプトエレクトロニクス素子
Research Abstract	部分課題1)浮遊帯溶融法による酸化物結晶の精製と評価まず、基本網物質としての高純度Cu_2O結晶の精製を行い、天然産(NA)、炉冷結晶(FA)の他、浮遊帯溶融装置を用いて得られた結晶(FZ,GZ)の評価を、X線回折,EPMA,発光,暗電流測定等の方法により行った。その結果、格子欠陥の面からも、浮遊帯溶融装置を用いて得られた結晶(FZ,GZ)がすぐれていることを確認した。部分課題2)酸化物絶縁体の相転移でのコンプトン散乱の異常による追求つぎに、酸化物絶縁体Cu_2O結晶に潜在すると推測される価電子系の低温での相転移を追求するため、基底状態の価電子系の運動量分布,スピン分極の温度依存性(T=4.2-300K)を観測する高分解能X線コンプトン散乱分光装置の設計、製作及び設置などの準備を行い、次年度以降の実験に備えた。部分課題3)熱平衡状態の相転移と光伝導の異常の相関の研究まず、研究代表者が最近Cu_2O結晶のくり返しパルス光伝導の温度依存性において温度減少と共に出現することを観測した特異な光伝導現象の詳細を追求し、特にこの異常の細部をさらに広い電場領域での変化を追求した。これはパルス光伝導における特異な温度依存性の外場による制御にあたり、磁場下での同様な現象の研究をも開始した。なお、Bi-O系超伝導性物質についても、同様な視点からの研究を展開するべく準備を行った。部分課題4)非線型光磁性-オプトサイクロトロン2重共鳴の研究さらに光磁性の測定として、励起光担体での測定では感度上の問題から,軌道反磁性にもとずくサイクロトロン共鳴法を採用し、高密度光励起状態ポーラロン-励起子系の非線形光学サイクロトロン共鳴現象の観測を拡張した。特に多量の不純物を内在させる天然産結晶においても同様な現象の観測を行い、この現象の普遍性を追求した。その他次年度以降の部分課題5),6)の準備をも行った。

Research Products

(12 results)

All Other

All Publications (12 results)

[Publications] Taizo Masumi.: "“PHOTOCONDUCTIVITY WITH ANOMALIES IN INSULATORS CORRELATED WITH HIGH-T_C SUPER CONDUCTIVITY"(Invited Review)" Phase Transitions. Vol.51. 127-174. ((1994))
[Publications] Taizo Masumi and Masakatsu Isobe: "“BASIC PRINCIPLES OF SUPER CONDUCTIVE OPTOELECTRONIC DEVICES"(Invited)" Proc.22nd Int.Conf.Phys.Semiconductors,. Vol.3. 2633-2640. ((1994))
[Publications] Taizo Masumi: "“Novel emergences and anomalies of photoconductivity in insulators correlative with high-Tc superconductivity"(Invited)" Proc.SPIE-The Intemational Society for Optical Engineering,Oxide Superconductor Physics and Nano-Engineering. Vol.2158. 158-169. ((1994))
[Publications] E.Zukowski,MJ.Cooper,D.N.Timms R.Armstring,F.Itoh,H.Sakurai,Y.Tanaka,M.Ito,H.Kawata,and R.Bateson: "“Temperature Dependence of the Magnetic Compton Profile of Ferrimagnetic HoFe_2"" J.Phys.Soc.Jpn.Vol.63. 3835-3846. ((1994))
[Publications] H.Kawata,T.Iwaizumi,N.Shiotani,and F.Itoh: "“Fitst Measurement of Site-specific Normal and Magnetic XANES by Using a Standing Wave Field"" Resonant Anomalous X-ray Scattering,Theory and Applications,eds.G.Materlik,C.J.Sparks,and K.Fisher,Elsevier Science B.V.,. 557-564. ((1994))
[Publications] F.Itoh and H.Sakurai: "“Magnetic Compton Profiles of Transition Metals Alloy System"" Extended Abstracts of “Workshop on Photon Neutron Studies of Magnetic Materials",Marathon,Greece,April8-11,. 12. ((1994))
[Publications] H.Sakurai,F.Itoh,N.Sakai,Y.Tanaka and H.Kawata: "“Magnetic Electron Momentum Distribution in Transition Metal Alloys"" Proc.1st Magneto-Electronics Int.Symp.,Nagano,Japan,Nov.9-11,. 57-60. ((1994))
[Publications] H.T.Kim,H.Uwe and H.Minami: "“Optical Measurement for Epitaxial Films of Ba_<1-X>Rb_XBiO_<3-d> Synthesized by Laser Ablation"" Adv.in Superconductivity. Vol.4. 191-194. ((1994))
[Publications] H.Minami: "“Optical Absorption Spectra of BaBiO_3 in Wide Temperature Range"" Physica C. Vol.235-240. 1151-1152. ((1994))
[Publications] H.Minami,M.Ishibashi,K.Oshima and H.Uwe: "“Effect of Light Irradiation on the Crystal Structure and conductivity of Reduced YBa_2Cu_3O_<7-y>"" Proc,7th Int.Symp.Superconductivity. (in press). ((1995))
[Publications] Horoyuki Yamaguchi: "“Anomalies in the Pulsed Photoconductivity of Undopeed C_<60> and Their Relationship to Phase Transitions"" J.Phys.Soc.Jpn.Vol.64. 527-532. ((1995))
[Publications] Hiroyuki Yamaguchi: "“Pulsed Photoconductivity in Single Crystals of C_<60> with Anomalies at Phase Transitions"" Proc.22nd Int.Conf.Phys.Semiconductors,. Vol.3. 2097-2100. ((1994))

1994 Fiscal Year Annual Research Report

酸化物系の相転移,光誘起秩序状態と超伝導共役性光応答のダイナミクスの研究

Principal Investigator

眞隅 泰三 群馬大学, 工学部, 教授 (20012304)

Research Products

[Publications] Taizo Masumi.: "“PHOTOCONDUCTIVITY WITH ANOMALIES IN INSULATORS CORRELATED WITH HIGH-T_C SUPER CONDUCTIVITY"(Invited Review)" Phase Transitions. Vol.51. 127-174. ((1994))

[Publications] Taizo Masumi and Masakatsu Isobe: "“BASIC PRINCIPLES OF SUPER CONDUCTIVE OPTOELECTRONIC DEVICES"(Invited)" Proc.22nd Int.Conf.Phys.Semiconductors,. Vol.3. 2633-2640. ((1994))

[Publications] Taizo Masumi: "“Novel emergences and anomalies of photoconductivity in insulators correlative with high-Tc superconductivity"(Invited)" Proc.SPIE-The Intemational Society for Optical Engineering,Oxide Superconductor Physics and Nano-Engineering. Vol.2158. 158-169. ((1994))

[Publications] E.Zukowski,MJ.Cooper,D.N.Timms R.Armstring,F.Itoh,H.Sakurai,Y.Tanaka,M.Ito,H.Kawata,and R.Bateson: "“Temperature Dependence of the Magnetic Compton Profile of Ferrimagnetic HoFe_2"" J.Phys.Soc.Jpn.Vol.63. 3835-3846. ((1994))

[Publications] H.Kawata,T.Iwaizumi,N.Shiotani,and F.Itoh: "“Fitst Measurement of Site-specific Normal and Magnetic XANES by Using a Standing Wave Field"" Resonant Anomalous X-ray Scattering,Theory and Applications,eds.G.Materlik,C.J.Sparks,and K.Fisher,Elsevier Science B.V.,. 557-564. ((1994))

[Publications] F.Itoh and H.Sakurai: "“Magnetic Compton Profiles of Transition Metals Alloy System"" Extended Abstracts of “Workshop on Photon Neutron Studies of Magnetic Materials",Marathon,Greece,April8-11,. 12. ((1994))

[Publications] H.Sakurai,F.Itoh,N.Sakai,Y.Tanaka and H.Kawata: "“Magnetic Electron Momentum Distribution in Transition Metal Alloys"" Proc.1st Magneto-Electronics Int.Symp.,Nagano,Japan,Nov.9-11,. 57-60. ((1994))

[Publications] H.T.Kim,H.Uwe and H.Minami: "“Optical Measurement for Epitaxial Films of Ba_<1-X>Rb_XBiO_<3-d> Synthesized by Laser Ablation"" Adv.in Superconductivity. Vol.4. 191-194. ((1994))

[Publications] H.Minami: "“Optical Absorption Spectra of BaBiO_3 in Wide Temperature Range"" Physica C. Vol.235-240. 1151-1152. ((1994))

[Publications] H.Minami,M.Ishibashi,K.Oshima and H.Uwe: "“Effect of Light Irradiation on the Crystal Structure and conductivity of Reduced YBa_2Cu_3O_<7-y>"" Proc,7th Int.Symp.Superconductivity. (in press). ((1995))

[Publications] Horoyuki Yamaguchi: "“Anomalies in the Pulsed Photoconductivity of Undopeed C_<60> and Their Relationship to Phase Transitions"" J.Phys.Soc.Jpn.Vol.64. 527-532. ((1995))

[Publications] Hiroyuki Yamaguchi: "“Pulsed Photoconductivity in Single Crystals of C_<60> with Anomalies at Phase Transitions"" Proc.22nd Int.Conf.Phys.Semiconductors,. Vol.3. 2097-2100. ((1994))

眞隅泰三群馬大学, 工学部, 教授 (20012304)