Theoretical Study of Strongly Correlated Electron Systems with Orbital Degeneracy
轨道简并强相关电子系统的理论研究
基本信息
- 批准号:11640365
- 负责人:
- 金额:$ 1.98万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research (C)
- 财政年份:1999
- 资助国家:日本
- 起止时间:1999 至 2000
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Following the recent discovery of the colossal magneto-resistance in perovskite mangan oxides there occurred explosional activities in experimental as well as theoretical investigations of the related materials. In these materials the degeneracy of 3d atomic orbitals accompanied by Hund's coupling, anisotropic hopping matrix elements, and Jahn-Teller effect is playing a decisive role. This project aimed to clarify the effects of the orbtal degeneracy on the thermodynamic and transport properties of these materials and predict novel properties. We investigated following subjects :1) the ground state of the doubly-degenetrate Hubbard model in one dimension2) the groundstate of the double-exchange model in infinite dimensions3) electronic states and resistivity in the double exchange model in general dimensions4) anomalous magnon dispersion in perovskite mangan oxides5) ferromagnetic phase transitions in the double-exchange model.We obtained following results :1) We obtained fundamental u … More nderstanding on the conditions for the appearance of ferromagnetism in strongly correlated systems with orbital degeneracy, transport properties in ferromagnetic states, the competition between antiferromagnetism and ferromagnetism and the effects of quantum fluctuations.In particular we clarified that a) when n (electron number density per site) is between 1 and 2, ferromagnetic state is stable in a wide region of parameters since the so-called double-exchange mechanism is quite effective., b) when n=1 ferromagnetism accompanied by orbital order is stabilized and c) when n<1 the stability of ferromagnetism is strongly affected by the electronic band structure and/or the lattice structure.2) the T cube law of the resistivity in half metals was theoretically derived.3) the anomalous magnon dispersion observed in perovskite mangan oxides was theoretically derived in terms of electron-phonon interactions4) lwe have accomplished large scale quantum Monte Carlo simulations of the double exchange model and estimated the criticall temperature and critical indioes of the ferromagnetic phase transitions. Less
在最近发现钙钛矿锰氧化物的巨大磁阻后,相关材料的实验和理论研究都发生了爆炸活动。在这些材料中,伴随着Hund耦合、各向异性跳跃矩阵元素和Jahn-Teller效应的三维原子轨道简并起着决定性的作用。本项目旨在阐明轨道简并对这些材料的热力学和输运性质的影响,并预测新的性质。我们研究了以下几个问题:1)一维双简并Hubbard模型的基态2)无限维双交换模型的基态3)一般维双交换模型中的电子态和电阻率4)钙钛矿锰氧化物中的反常磁振子色散5)双交换模型中的铁磁相变。我们对轨道简并的强相关系统中铁磁性的出现条件、铁磁性态的输运性质、反铁磁性和铁磁性之间的竞争以及量子涨落的影响有了更深入的了解。特别地,我们澄清了a)当n(每个位点的电子数密度)在1和2之间时,铁磁状态在很宽的参数范围内是稳定的,因为所谓的双交换机制是相当有效的。b)当n=1时,伴轨道序的铁磁性稳定;c)当n<1时,电子能带结构和/或晶格结构对铁磁性的稳定性影响较大。2)从理论上推导了半金属中电阻率的T立方定律。3)从电子-声子相互作用的角度推导了钙钛矿锰氧化物中反常的磁振子色散。4)完成了双交换模型的大规模量子蒙特卡罗模拟,并估计了铁磁相变的临界温度和临界指数。少
项目成果
期刊论文数量(37)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
M.Edwards, A.C.M.Green and K.Kubo: "Electronic Structure and resistivity of the double exchange model"J.Phys. : Condens.Matter. Vol.11. 2791-2808 (1999)
M.Edwards、A.C.M.Green 和 K.Kubo:“双交换模型的电子结构和电阻率”J.Phys。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
N.Furukawa: "Magnon Linewidth Broadening due to Magnon-Phonon Interaction in Colossal Magnetorosistance Manganites"Journal of Physical Society of Japan. 68・8. 2522-2525 (1999)
N.Furukawa:“巨磁阻锰矿中磁振子-声子相互作用导致的磁振子线宽展宽”,日本物理学会杂志 68・8(1999 年)。
- DOI:
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- 影响因子:0
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T.Momoi and K.Totsuka: "Magnetization Plateaus as Insulator-Superfluid Transitions in Quantum Spin Systems"Phys.Rev.B. Vol.61. 3231-3234 (2000)
T.Momoi 和 K.Totsuka:“磁化平台作为量子自旋系统中的绝缘体-超流体转变”Phys.Rev.B。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
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N.Furukawa: "Thermodynamics of the Double exchange Systems"Physics of Manganites. ed. by T.A.Kaplan and S.D.Mahanti, Kluwer Academic/Plenum Publishers. 1-38 (1999)
N.Furukawa:“双交换系统的热力学”锰酸盐物理学。
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- 影响因子:0
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J.Kishine,N.Furukawa,and K.Yonemitsu: "Two-Loop Renormalization of the Quasiparticle Weight in Two-Dimensional Electron Systems"RECENT PROGRESS IN MANY-BODY THEORIES eds.R.F.Bishop,K.A.Gernoth,N.R.Walet and Yang Xian,(World Scientific,Singapore). Vol.3. (
J.Kishine、N.Furukawa 和 K.Yonemitsu:“二维电子系统中准粒子重量的双环重整化”多体理论的最新进展 eds.R.F.Bishop、K.A.Gernoth、N.R.Walet 和 Yang Xian,
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KUBO Kenn其他文献
KUBO Kenn的其他文献
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{{ truncateString('KUBO Kenn', 18)}}的其他基金
Theoretical Study of Magnetism and Transport Properties in Diluted Magnetic Semiconductors
稀磁半导体磁性和输运特性的理论研究
- 批准号:
17540339 - 财政年份:2005
- 资助金额:
$ 1.98万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
Theoretical Study on the Multiple-exchange Interactions in Two-dimensional Quantum Solids
二维量子固体多重交换相互作用的理论研究
- 批准号:
10203202 - 财政年份:1998
- 资助金额:
$ 1.98万 - 项目类别:
Grant-in-Aid for Scientific Research on Priority Areas (B)
Theoretical Study on multi-band effect on the ferromagnetism of itinerant electrons
巡回电子铁磁性多能带效应的理论研究
- 批准号:
09640453 - 财政年份:1997
- 资助金额:
$ 1.98万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
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