Controlled electronic phases of transition metal oxides

过渡金属氧化物的受控电子相

• 批准号: 19204035
• 负责人: MAEKAWA Sadamichi
• 金额: $ 24.54万
• 依托单位: Japan Atomic Energy Agency (2010)Tohoku University (2007-2009)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 2007
• 资助国家: 日本
• 起止时间: 2007 至 2010
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-19204035/
• 关键词: 磁性半導体; 強磁性; 第一原理計算; 量子モンテカルロ法; 強相関電子系; 遷移金属酸化物; 高温超伝導; 熱起電力; スピン流; スピンホール効果; 量子モンテカルロ計算; 超伝導; ジョセフソン接合; 強相関係; 新機能材料; 超伝導体; 強磁性体; スピン波; ジョセフソン効果; Fiske共鳴; 不純物準位; MgO; 数値シミュレーション; タンパク質

In the strongly correlated electron systems, various electronic phases such as superconductivity and ferromagnetism are competed. This study aims to understand such competing electronic phases in the correlated electron systems by use of numerical techniques. Magnetic semiconductors show some unique properties by a coupling between conduction electrons and magnetic ions. Due to this coupling, one needs to consider simultaneously the electronic states of semiconductors and the electrons correlation inducing the magnetism. In this study, we combine the density functional theory for the electronic states of semiconductors and the quantum Monte Carlo method to include the correlation effects of magnetic ions. Furthermore, the thermoelectric power in the correlated electron systems is clarified by the dynamical mean-field theory.

在强相关电子系统中，各种电子相如超导性、铁磁性等相互竞争。本研究旨在通过使用数值技术来了解相关电子系统中的这种竞争电子相。磁性半导体通过传导电子和磁性离子之间的耦合表现出一些独特的性质。由于这种耦合，需要同时考虑半导体的电子态和引起磁性的电子相关性。在这项研究中，我们将半导体电子态的密度泛函理论和量子蒙特卡罗方法结合起来，以考虑磁性离子的相关效应。此外，相关电子系统中的热电势由动态平均场理论阐明。

项目成果

Polarization-analyzed resonant inelastic x-ray scattering of the orbital excitations in KCuF_3

KCuF_3 轨道激发的偏振分析共振非弹性 X 射线散射

• DOI: 10.1103/physrevb.83.241101
• 发表时间: 2011
• 期刊: Phys. Rev. B
• 作者: Ikeuchi;K. Kuzushita;T. Inami;K. Ohwada;M. Yoshida;I. Jarrige;N. Tatami;S. Niioka;D. Bizen;Y. Ando;J. Mizuki;S. Maekawa;Y. Endoh
• 通讯作者: Y. Endoh

Exact diagonalization calculations of hole binding around Ni impurities in Ni-substituted cuprate superconductors

镍取代铜酸盐超导体中镍杂质周围空穴结合的精确对角化计算

• DOI: 10.1103/physrevb.80.224519
• 发表时间: 2009
• 期刊: Phys. Rev. B
• 作者: K. Tsutsui;A. Toyama;T. Tohyama;and S. Maekawa
• 通讯作者: and S. Maekawa

Effect of spin-dependent screening on tunneling electroresistance and tunneling magnetoresistance in multiferroic tunnel junctions

• DOI: 10.1103/physrevb.81.104419
• 发表时间: 2010-03
• 期刊: Physical Review B
• 影响因子: 3.7
• 作者: M. Zhuravlev;S. Maekawa;E. Tsymbal

Inter-impurity and impurity-host magnetic correlations in semiconductors with low-density transition-metal impurities

具有低密度过渡金属杂质的半导体中杂质间和杂质主体磁相关性

• 发表时间: 2009
• 期刊: Physica B condensed matted 404
• 作者: Y.Tomoda;N.Bulut;S.Maekawa
• 通讯作者: S.Maekawa

Charge Excitations and Resonant Inelastic X-ray Scattering in Ladder Cuprates

梯形铜氧化物中的电荷激发和共振非弹性 X 射线散射

• 发表时间: 2007
• 期刊: Physica C 460-462
• 作者: K. Tsutsui;T. Tohyama and S. Maekawa
• 通讯作者: T. Tohyama and S. Maekawa