1999 年度実績報告書

軌道縮退系の電子構造

研究課題

研究課題/領域番号	11220203
研究機関	東北大学
研究代表者	青木晴善東北大学, 極低温科学センター, 教授 (60302246)
研究分担者	高木滋東北大学, 大学院・理学研究科, 助教授 (20154750) 高橋隆東北大学, 大学院・理学研究科, 助教授 (00142919) 國井暁東北大学, 大学院・理学研究科, 助教授 (10004368) 中村慎太郎東北大学, 極低温科学センター, 助手 (20292310) 木村憲彰東北大学, 極低温科学センター, 助手 (30292311)
キーワード	軌道秩序 / 高温強磁性 / 四重極転移 / Ca_<1-x>La_xB_6 / CeB_6 / DyB_2C_2 / Ce_3Pd_<20>Ge_6 / TmTe
研究概要	今年度購入した装置は順調に立ち上がりつつある。主要な成果は以下の通りである。 1.我々はAlフラックス法により高温で強磁性を示す低キャリアー密度物質CaB_6およびLaをドープした単結晶を作製し、基礎物性測定、電子スピン共鳴によりこの物質の強磁性の特異性を明らかした。さらに、Alフラックスを用いないフローティングゾーン法により単結晶の作製に初めて成功した。 2.軌道秩序を示す典型物質CeB_6のフェルミ面、有効質量、反強四重極転移温度、反強磁性転移温度の異常な圧力依存性と相互の関係を明らかにした。また、Laとの混晶のIV相で熱物性、磁気抵抗の測定から近藤効果の役割を明らかにした。新しい軌道秩序を示す物質DyB_2C_2で光電子分光法およびドハースファンアルフェン(dHvA)効果により電子構造を明らかにした。 3.軸性圧力下のdHvA効果の開発を行い、軌道秩序を示す物質Ce_3Pd_<20>Ge_6およびその参照物質で初めてフェルミ面の軸性圧力変化による変化を明らかにした。 4.TmTeの四重極秩序相でTeのNMR観測に成功した。TeをSeで10%置き換えることによって0.6K以上で四重極秩序相からの信号が観測できなくなることを明らかにした。CeTeでは初めてドハースファンアルフェン効果が観測できる純良単結晶作製に成功した。 5.軌道自由度が重要となる局在f電子系化合物の純良単結晶育成に着手するとともに、UN,UCで光電子分光法によりバンド構造を明らかにした。 6.電荷秩序を起こす物質Yb_4As_3のシングルドメイン試料を作製し、低温での磁気的な振る舞いが概略は一次元鎖の交替磁場の理論で説明できるが、それでも説明できない異常があることを明らかにした。また、ホール面からのシュブニコフドハースの観測に成功した。

研究成果
(43件)

すべてその他

すべて文献書誌 (43件)

[文献書誌] N.E.Sluchanko,et al.: "Nature of the low temperature anomalies in the physical properties of intermediate valence compound SmB_6"Zh.Eksp.Teor.Fiz(JETP). 115. 970-978 (1999)
[文献書誌] T.Sakakibara,et al.: "Magnetization Study of the Phase Diagram of Ce_xLa_<1-x>B_6"JJAP Series. 11. 179-181 (1999)
[文献書誌] T.Tayama,et al.: "Magnetic Phase Diagram of Ce_xLa_<1-x>B_6 Studied by Magnetization Measurement"Physica B. 259-261. 32-33 (1999)
[文献書誌] M.Hiroi,et al.: "Magnetic phase diagrams of Ce_<0.4>La_<0.6>B_6 up to 15 T investigated by specific heat measurements"Physica B. 259-261. 34-35 (1999)
[文献書誌] S.Nakamura,et al.: "Magnetic phase diagram and low-temperature properties of Ce_<0.5>La_<0.5>B_6"Physica B. 259-261. 36-37 (1999)
[文献書誌] M.Dressel,et al.: "Low-Energy Specroscopy of SmB_6"Physica B. 259-261. 347-348 (1999)
[文献書誌] T.Sakai,et al.: "Thermal expansion of the structural phase transition in DyB_6 under high pressure"Physica B. 259-261. 904-906 (1999)
[文献書誌] S.Kimura,et al.: "Optical Spectra of RB_x(R=Rare-Earth,x=4,6,12)"J.Electron Spectroscopy and Related Phenomena. 101-103. 761-764 (1999)
[文献書誌] S.Awaji,et al.: "Metamagnetic Transition in NbB_6 with a Small Magnetic Anisotropy in Low Magnetic Fields"J.Phys.Soc.Jpn.. 68. 2518-2521 (1999)
[文献書誌] M.Dressel,et al.: "Dielectric Response of SmB_6 in the Millimeter Wave Range"Phys.stat.sol.. (b)215. 161-164 (1999)
[文献書誌] S.Kunii: "Ferromagnetic Resonance in Ca_<0.995>La_<0.005>B_6"J.Phys.Soc.Jpn.. 68. 3189-3190 (1999)
[文献書誌] S.M.Butorin,et al.: "Resonant inelastic soft-x-ray scattering at the 4d edge of Ce-based heavy-ferion materials"J.Electron Spectroscopy and Related Phenomena. 101-103. 783-786 (1999)
[文献書誌] S.Kobayashi,et al.: "Antiferro-Multipolar Short Range Order above the Antiferro-Quadrupolar Ordering Temperature in CeB_6"J.Phys.Soc.Jpn.. 68. 3407-3412 (1999)
[文献書誌] S.Kunii,et al.: "Phonon structure and specific heat analysis of rare-earth hexaborides"J.Solid State Chemistry. (印刷中). (1999)
[文献書誌] N.E.Sluchanko,et al.: "The origin of the fast valence fluctuations and metal-insulator transition in SmB_6"Zr.Eksp.Teor.Fiz.(JETP). (印刷中). (1999)
[文献書誌] O.Suzuki,et al.: "Ultrasonic study of Kondo compounds Ce_xLa_<1-x>B_6(x=0.60 and 0.75)"Physica B. (印刷中). (1999)
[文献書誌] T.Goto,et al.: "Quadrupolar effects of HoB_6 and DyB_6"Physica B. (印刷中). (1999)
[文献書誌] T.Takikawa et al.: "Magnetic properties of Ce_<0.75>La_<0.25>B_6 under uniaxial stress"Physica B. (印刷中). (1999)
[文献書誌] Sekiyama,et al.: "Effect of a crystalline electric field on photoemission spectra of CeB_6"Physica B. (印刷中). (1999)
[文献書誌] H.Kumigashira,et al.: "High-resolution angle-resolved photoemission study of RSb (R=La,Ce,U)"Physica B. 259-261. 1124-1125 (1999)
[文献書誌] Hyeong-Do Kim,et al.: "Surface and bulk 4f photoemission spectra of CeIr_2"Phys.Rev.B. 59. 12294-12297 (1999)
[文献書誌] T.Ito.et al.: "High-Resolution Angle-Resolved Photoemission Study of Uru_2Si_2"Jpn.J.Appl.Phys.series. 11. 68-70 (1999)
[文献書誌] T.Ito,et al.: "Band structure and Fermi surface of Uru_2Si_2 studied by high-resolutionangle-resolved photoemission spectroscopy"Phys.Rev.B. 60. 13390-13395 (1999)
[文献書誌] S.M.Butorin,et al.: "Resonant inelastic soft-X-ray scattering at the 4d edge of Ce-based heavy-fermion materials"J.Electron Spectroscopy and Related Phenonema. 101-103. 783-786 (1999)
[文献書誌] A.Ochiai,et al.: "Relation between low-temperature properties and one dimensional Yb3+chains in Yb_4As_3"JJAP series. 11. 117-119 (1999)
[文献書誌] Y.Nemoto,et al.: "Ultrasonic study for the charge ordering of Yb_4As_3"JJAP series. 11. 120-122 (1999)
[文献書誌] N.Kimura,et al.: "Magnetic properties of R_3Pd_<20>Ge_6(R=Pr and Nd)"Physica B. 259-261. 338-339 (1999)
[文献書誌] J.Kitagawa,et al.: "Anisotropic Magnetic Diagram of Ce_3Pd_<20>Ge_6 with Quadrupolar Ordering"Physica B. 259-261. 332-333 (1999)
[文献書誌] Y.Haga,et al.: "Purification of Uranium Metal and High-Quality Single Crystal Growth"JJAP Series. 11. 269-271 (1999)
[文献書誌] M.Kohgi,et al.: "Magnetic excitations in the charge ordered state of Yb_4As_3 and Yb_4(As_<0.6>P_<0.4>)_3"Physica B. 259-261. 269-270 (1999)
[文献書誌] A.Ochiai,et al.: "Physical properties of Yb_4As_3 and related compounds"Physica B. 259-261. 277-279 (1999)
[文献書誌] T.Miura,et al.: "dHvA effect Study of CeBi in the ferromagnetic and Ferrimagnetic Phases"Physica B. 259-261. 1089-1090 (1999)
[文献書誌] C.Terakura,et al.: "Metamagnetic transition and dHvA Effect of U_2Rh_3Si_5"Physica B. 259-261. 1087-1088 (1999)
[文献書誌] H.Aoki,et al.: "DHVA effect Study on the Metamagnetic Transitions of Strongly Correlated Electron Systems"Procdeedings of Physical Phenomena at High Magnetic Fields III. 130-135 (1999)
[文献書誌] T.Terashima,et al.: "Low-field low-temperature magnetotransport studies of CeP"Phys.Rev.B. 60. 15285-15289 (1999)
[文献書誌] K.Magishi,et al.: "^<11>B NMR in the antiferromagnetic phases of CeB_6"Physica B. (印刷中). (1999)
[文献書誌] M.Takashita,et al.: "De Haas van-Alphen Effect Study of CeCo_2 under Pressure"Physica B. (印刷中).
[文献書誌] Tateiwa,et al.: "Low Temperature Physical Properties of U_3Pd_<20>Si_6"Physica B. (印刷中).
[文献書誌] Tateiwa,et al.: "Transport,Thermal and Magnetic Properties of the New Ternary Compound U_3Pd_<20>Si_6 : Possibility of a New Localized Electron System"J.Phys.Soc.Jpn.. (印刷中).
[文献書誌] D.Maruta,et al.: "Evidence from ^<29>Si NMR of the Importance of the Hybridization between 5f and Conduction Electrons in U_3Pd_<20>Si_6"Physica B. (印刷中).
[文献書誌] S.Takagi,et al.: "NMR and NQR studies of Yb_4(As_<1-x>P_x)_3 systems"Physica B. (印刷中).
[文献書誌] T.Horino,et al.: "Quadrupolar Effect of R_3Pd_<20>Ge_6(R=Ce,Pr,Nd)"Physica B. (印刷中).
[文献書誌] T.Terashima,et al.: "Magnetotran sport Studies of the Low-carrier-density Semimetal CeP"Physica B. (印刷中).

1999 年度 実績報告書

軌道縮退系の電子構造

研究代表者

青木 晴善 東北大学, 極低温科学センター, 教授 (60302246)

研究成果

[文献書誌] N.E.Sluchanko,et al.: "Nature of the low temperature anomalies in the physical properties of intermediate valence compound SmB_6"Zh.Eksp.Teor.Fiz(JETP). 115. 970-978 (1999)

[文献書誌] T.Sakakibara,et al.: "Magnetization Study of the Phase Diagram of Ce_xLa_<1-x>B_6"JJAP Series. 11. 179-181 (1999)

[文献書誌] T.Tayama,et al.: "Magnetic Phase Diagram of Ce_xLa_<1-x>B_6 Studied by Magnetization Measurement"Physica B. 259-261. 32-33 (1999)

[文献書誌] M.Hiroi,et al.: "Magnetic phase diagrams of Ce_<0.4>La_<0.6>B_6 up to 15 T investigated by specific heat measurements"Physica B. 259-261. 34-35 (1999)

[文献書誌] S.Nakamura,et al.: "Magnetic phase diagram and low-temperature properties of Ce_<0.5>La_<0.5>B_6"Physica B. 259-261. 36-37 (1999)

[文献書誌] M.Dressel,et al.: "Low-Energy Specroscopy of SmB_6"Physica B. 259-261. 347-348 (1999)

[文献書誌] T.Sakai,et al.: "Thermal expansion of the structural phase transition in DyB_6 under high pressure"Physica B. 259-261. 904-906 (1999)

[文献書誌] S.Kimura,et al.: "Optical Spectra of RB_x(R=Rare-Earth,x=4,6,12)"J.Electron Spectroscopy and Related Phenomena. 101-103. 761-764 (1999)

[文献書誌] S.Awaji,et al.: "Metamagnetic Transition in NbB_6 with a Small Magnetic Anisotropy in Low Magnetic Fields"J.Phys.Soc.Jpn.. 68. 2518-2521 (1999)

[文献書誌] M.Dressel,et al.: "Dielectric Response of SmB_6 in the Millimeter Wave Range"Phys.stat.sol.. (b)215. 161-164 (1999)

[文献書誌] S.Kunii: "Ferromagnetic Resonance in Ca_<0.995>La_<0.005>B_6"J.Phys.Soc.Jpn.. 68. 3189-3190 (1999)

[文献書誌] S.M.Butorin,et al.: "Resonant inelastic soft-x-ray scattering at the 4d edge of Ce-based heavy-ferion materials"J.Electron Spectroscopy and Related Phenomena. 101-103. 783-786 (1999)

[文献書誌] S.Kobayashi,et al.: "Antiferro-Multipolar Short Range Order above the Antiferro-Quadrupolar Ordering Temperature in CeB_6"J.Phys.Soc.Jpn.. 68. 3407-3412 (1999)

[文献書誌] S.Kunii,et al.: "Phonon structure and specific heat analysis of rare-earth hexaborides"J.Solid State Chemistry. (印刷中). (1999)

[文献書誌] N.E.Sluchanko,et al.: "The origin of the fast valence fluctuations and metal-insulator transition in SmB_6"Zr.Eksp.Teor.Fiz.(JETP). (印刷中). (1999)

[文献書誌] O.Suzuki,et al.: "Ultrasonic study of Kondo compounds Ce_xLa_<1-x>B_6(x=0.60 and 0.75)"Physica B. (印刷中). (1999)

[文献書誌] T.Goto,et al.: "Quadrupolar effects of HoB_6 and DyB_6"Physica B. (印刷中). (1999)

[文献書誌] T.Takikawa et al.: "Magnetic properties of Ce_<0.75>La_<0.25>B_6 under uniaxial stress"Physica B. (印刷中). (1999)

[文献書誌] Sekiyama,et al.: "Effect of a crystalline electric field on photoemission spectra of CeB_6"Physica B. (印刷中). (1999)

[文献書誌] H.Kumigashira,et al.: "High-resolution angle-resolved photoemission study of RSb (R=La,Ce,U)"Physica B. 259-261. 1124-1125 (1999)

[文献書誌] Hyeong-Do Kim,et al.: "Surface and bulk 4f photoemission spectra of CeIr_2"Phys.Rev.B. 59. 12294-12297 (1999)

[文献書誌] T.Ito.et al.: "High-Resolution Angle-Resolved Photoemission Study of Uru_2Si_2"Jpn.J.Appl.Phys.series. 11. 68-70 (1999)

[文献書誌] T.Ito,et al.: "Band structure and Fermi surface of Uru_2Si_2 studied by high-resolutionangle-resolved photoemission spectroscopy"Phys.Rev.B. 60. 13390-13395 (1999)

[文献書誌] S.M.Butorin,et al.: "Resonant inelastic soft-X-ray scattering at the 4d edge of Ce-based heavy-fermion materials"J.Electron Spectroscopy and Related Phenonema. 101-103. 783-786 (1999)

[文献書誌] A.Ochiai,et al.: "Relation between low-temperature properties and one dimensional Yb3+chains in Yb_4As_3"JJAP series. 11. 117-119 (1999)

[文献書誌] Y.Nemoto,et al.: "Ultrasonic study for the charge ordering of Yb_4As_3"JJAP series. 11. 120-122 (1999)

[文献書誌] N.Kimura,et al.: "Magnetic properties of R_3Pd_<20>Ge_6(R=Pr and Nd)"Physica B. 259-261. 338-339 (1999)

[文献書誌] J.Kitagawa,et al.: "Anisotropic Magnetic Diagram of Ce_3Pd_<20>Ge_6 with Quadrupolar Ordering"Physica B. 259-261. 332-333 (1999)

[文献書誌] Y.Haga,et al.: "Purification of Uranium Metal and High-Quality Single Crystal Growth"JJAP Series. 11. 269-271 (1999)

[文献書誌] M.Kohgi,et al.: "Magnetic excitations in the charge ordered state of Yb_4As_3 and Yb_4(As_<0.6>P_<0.4>)_3"Physica B. 259-261. 269-270 (1999)

[文献書誌] A.Ochiai,et al.: "Physical properties of Yb_4As_3 and related compounds"Physica B. 259-261. 277-279 (1999)

[文献書誌] T.Miura,et al.: "dHvA effect Study of CeBi in the ferromagnetic and Ferrimagnetic Phases"Physica B. 259-261. 1089-1090 (1999)

[文献書誌] C.Terakura,et al.: "Metamagnetic transition and dHvA Effect of U_2Rh_3Si_5"Physica B. 259-261. 1087-1088 (1999)

[文献書誌] H.Aoki,et al.: "DHVA effect Study on the Metamagnetic Transitions of Strongly Correlated Electron Systems"Procdeedings of Physical Phenomena at High Magnetic Fields III. 130-135 (1999)

[文献書誌] T.Terashima,et al.: "Low-field low-temperature magnetotransport studies of CeP"Phys.Rev.B. 60. 15285-15289 (1999)

[文献書誌] K.Magishi,et al.: "^<11>B NMR in the antiferromagnetic phases of CeB_6"Physica B. (印刷中). (1999)

[文献書誌] M.Takashita,et al.: "De Haas van-Alphen Effect Study of CeCo_2 under Pressure"Physica B. (印刷中).

[文献書誌] Tateiwa,et al.: "Low Temperature Physical Properties of U_3Pd_<20>Si_6"Physica B. (印刷中).

[文献書誌] Tateiwa,et al.: "Transport,Thermal and Magnetic Properties of the New Ternary Compound U_3Pd_<20>Si_6 : Possibility of a New Localized Electron System"J.Phys.Soc.Jpn.. (印刷中).

[文献書誌] D.Maruta,et al.: "Evidence from ^<29>Si NMR of the Importance of the Hybridization between 5f and Conduction Electrons in U_3Pd_<20>Si_6"Physica B. (印刷中).

[文献書誌] S.Takagi,et al.: "NMR and NQR studies of Yb_4(As_<1-x>P_x)_3 systems"Physica B. (印刷中).

[文献書誌] T.Horino,et al.: "Quadrupolar Effect of R_3Pd_<20>Ge_6(R=Ce,Pr,Nd)"Physica B. (印刷中).

[文献書誌] T.Terashima,et al.: "Magnetotran sport Studies of the Low-carrier-density Semimetal CeP"Physica B. (印刷中).

1999 年度実績報告書

青木晴善東北大学, 極低温科学センター, 教授 (60302246)