On the Metal-Insulator Transitions in VO_2 and Ti_2O_3 from a Unified Viewpoint(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)
スポンサーリンク
概要
- 論文の詳細を見る
The metal-insulator (M-I) transitions in VO_2 and Ti_2O_3 were investigated using the three-band Hubbard model in connection with the on-site exchange interaction and lattice distortions. Although these two compounds have different crystal structures, the mechanism of the phase transitions can be understood from a unified viewpoint; an increase in energy level separation among the f_<2g> orbilals caused by the lattice distortion triggers an abrupt change in the electron configuration in doubly occupied sites from an S = 1 Hund's coupling state to a low-spin S = 0 state with much largerenergy and this strongly suppresses the charge fluctuation, resulting in localization of electrons. These M-I transitions are not induced by an increase in relative strength of the Coulomb interaction against the electron hopping as in the conventional scenario of the Mott-Hubbard transition but by the level splitting among the f_<2g> orbitals against the on-site exchange interaction. Switching of the nearest-neighbor spin and orbital correlations and large change in the orbital occupation occur at the M-I transitions. Observation of the change in the orbital occupation at the M-I transitions by the linear dichroic V or Ti 2p x-ray absorption spectroscopy can be a crucial check to this theory.
- 社団法人日本物理学会の論文
- 2004-01-15
著者
-
Tanaka A
Adsm Hiroshima University
-
Tanaka Arata
Department Of Quantum Matter Adsm Hiroshima University
関連論文
- 22pPSB-29 Auナノロッドの液相調製と光電子分光(22pPSB 領域9ポスターセッション,領域9(表面・界面,結晶成長))
- 22aPS-9 Si(111)清浄表面の干渉型時間分解2光子光電子分光II(22aPS 領域5ポスターセッション,領域5(光物性))
- 23aYJ-5 アルカンチオレート表面修飾Agナノ粒子の干渉型時間分解2光子光電子分光(微粒子・ナノ結晶・低次元物質,領域5,半導体,メゾスコピック系・局在)
- 26aPS-51 デンドリマー-Au複合ナノクラスターの精密調製と分光学的評価III(ポスターセッション,領域5,光物性)
- 23pPSB-17 デンドリマー-Au複合ナノクラスターの精密調製と分光学的評価II(領域5ポスターセッション,領域5,光物性)
- 23pPSB-18 アルキル基表面修飾Siナノ粒子の表面化学状態と光物性(領域5ポスターセッション,領域5,光物性)
- 24aTK-1 ドデカンチオレート表面修飾Agナノ粒子の時間分解2光子光電子分光(光電子分光・MCD,領域5,光物性)
- 19pPSA-8 Si(111)清浄表面の干渉型時間分解2光子光電子分光(ポスターセッション,領域5,光物性)
- 19pPSA-40 デンドリマー-Au複合ナノクラスターの精密調製と分光学的評価(ポスターセッション,領域5,光物性)
- 26aQE-12 デンドリマー内包Auナノクラスターの光電子分光(26aQE 光電子分光・逆光電子分光・放射光真空紫外分光,領域5(光物性))
- 26aQE-13 アルキル基表面修飾Siナノ粒子の光電子分光(26aQE 光電子分光・逆光電子分光・放射光真空紫外分光,領域5(光物性))
- 28aXJ-2 デンドリマー内包Auナノクラスターの合成と分光学的評価(28aXJ 微粒子・クラスタ・結晶成長,領域9(表面・界面,結晶成長))
- 19pYD-3 有機分子-金属ハイブリッドナノクラスターの光電子分光(光電子分光,領域5(光物性))
- 25aXQ-3 単分散アルカンチオレート表面修飾Auナノ粒子の光電子分光(光電子分光・逆光電子分光,領域5(光物性))
- 28aPS-59 有機分子表面修飾Siナノ粒子の合成と分光学的評価(28aPS 領域5ポスターセッション,領域5(光物性))
- 20pPSB-2 アルキル基表面修飾Siナノ粒子の合成と分光学的評価(領域5ポスターセッション,領域5(光物性))
- 25aXQ-2 表面修飾Agナノ粒子のフェムト秒コヒーレント時間分解2光子光電子分光III(光電子分光・逆光電子分光,領域5(光物性))
- Complete Assignment of Spin Domains in Antiferromagnetic NiO(100) by Photoemission Electron Microscopy and Cluster Model Calculation
- 化合物半導体ナノ粒子の電子励起効果と相生成
- 19pYD-6 高分解能干渉型時間分解2光子光電子分光装置の建設II(光電子分光,領域5(光物性))
- 24aPS-27 高分解能干渉型時間分解2光子光電子分光装置の建設(領域5ポスターセッション,領域5(光物性))
- Strong 3d-Ligand Hybridization in TiO_2 and Satellite Structures in Ti 3d and 3p Photoemission
- Configuration Interaction in Ni Metal and Ni Alloys and High-Energy Spectroscopy
- On the Metal-Insulator Transitions in VO_2 and Ti_2O_3 from a Unified Viewpoint(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)
- Electronic Structure and Phase Transition in V_2O_3 : Importance of 3d Spin-Orbit Interaction and Lattice Distortion
- Intersite Effects on Valence Band Photoemission Spectra of Undoped CuO_2 Plane and CuO_3 Chain
- Magnetic Circular Dichroism of 3d-2p and 4d-2p X-Ray Emission in Rare Earths
- Resonant Inverse Photoemission and Many-Body Effect in Nickel
- Selection Rules in X-Ray Second Order Optical Processes for Rare Earths
- Effect of Electron Doping on Spectral Function of Cu-Oxide Cluster Model Including Full Multiplet : Shift of Valence Band Edge
- Theory of Resonant Inverse Photoemission Spectroscopy in Ce Compounds : Selection Rule and Hybridization Strength
- Spin Polarization of 3d, 3p and 3s Photoemission in Ferromagnetic Nickel Predicted at Ni 2p Core Threshold
- Selection Rules in Resonant 4f Photoemission for Rare Earths
- Resonant 3d, 3p and 3s Photoemission in Transition Metal Oxides Predicted at 2p Threshold
- Capability of Resonant Photoemission with Soft X-Rays in Rare-Earth Systems
- Spin Polarization of 3d Photoemission at 3p Threshold in Ferromagnetic Ni Expected from Configuration Interaction Model
- Resonances in 3d Electron Photoemission Predicted at Ni2p Threshold for NiCl_2 and NiO
- Complex-Orbital Ordering and Verwey Transition in Fe_3O_4(Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties)
- Complex-Orbital Order in Fe_3O_4 and Mechanism of the Verwey Transition(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
- A New Scenario on the Metal-Insulator Transition in VO_2 (Condensed Matter: Electric Structure, Electrical, Magnetic and Optical Properties)
- Temperature Dependence of 2p-Core X-Ray Absorption Spectra in 3d Transition-Metal Compounds
- A New Scenario on the Metal-Insulator Transition in VO_2
- On the Metal-Insulator Transitions in VO_2 and Ti_2O_3 from a Unified Viewpoint
- Resonances and Magnetic Circular Dichrosim in Valence-Band Photoemission Predicted at Ni 2p Threshold for Ferromagnetic Nickel
- Effect of Coulomb Interaction on the X-Ray Magnetic Circular Dichroism Spin Sum Rule in Rare Earths