Theoretical Study of Nested Spin Fluctuations
嵌套自旋涨落的理论研究
基本信息
- 批准号:07640477
- 负责人:
- 金额:$ 1.28万
- 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:1995
- 资助国家:日本
- 起止时间:1995 至 1997
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Through this three years project, it has been shown that the anomalous properties of high-T_c cuprates, such as spin-gap behaviors and spin-charge separation aspects, can be understood in a unified way by taking into account the effects of nested spin-fluctuations on the basis of the Fermi liquid theory. Namely, the origin of such anomalous behaviors has been shown to be attributed to the fact that the spectral weight of coherent spin fluctuations decreases in the low-energy regime because the Fermi surface of the quasiparticles is inevitably nested as the antiferromagnetic Mott insulating state is approached. At the same time, it has been pointed out that the incoherent part of spin fluctuations also plays a crucial role in order to understand these anomalous behaviors consistently.It was also shown that the anomalous behaviors of V_2O_3, which had been considered to be a typical example exhibiting the Mott transition, can be understood as those originating from the nested spin-fluctu … More ations.It was shown, on the basis of the Gutzwiller treatment of d-p model with reasonable values of parameters, that the high-T_c cuprates are the materials belonging to the intermediate coupling regime and their origin of Mott transition should be attributed to the antiferromagnetic correlations accompanied by the nesting of the Fermi surface.A microsopic justification of the Itinerant-Localized Duality Model, which had been offering the basis of a theory of nested spin-fluctuations in strongly correlated metals, was given by means of the skeleton-expansion method of Luttinger-Ward.The anomalous properties of weak magnetism of URu_2Si_2 was shown to be understood as a moment-induced mechanism of the crystal-field singlet ground state of f^2-configuration of U ion together with the nesting effect of a part of the Fermi surface. In particular, it was derived naturally that the magnetic-field dependence of T_N, the Neel temperature, and m (0), the ordered moment at T=0, are scaled by apparently different magnitudes of magnetic field. Less
通过这三年的工作,我们发现,在费米液体理论的基础上,考虑嵌套自旋涨落的影响,可以统一地理解高T_c铜氧化物的反常性质,如自旋能隙行为和自旋-电荷分离现象。也就是说,这种异常行为的起源已被证明是归因于这样一个事实,即相干自旋涨落的谱权重在低能区减少,因为准粒子的费米面是不可避免地嵌套作为反铁磁莫特绝缘态的接近。同时指出,自旋涨落的非相干部分对理解这些反常行为也起着至关重要的作用,并指出V_2O_3的反常行为可以理解为自旋涨落的嵌套行为,而V_2O_3是Mott跃迁的典型例子 ...更多信息 通过对d-p模型的Gutzwiller处理和合理的参数值,指出高T_c铜氧化物是属于中间耦合区的材料,其Mott相变的起源应归因于反铁磁关联和费米面的嵌套。它为强关联金属中的嵌套自旋涨落理论提供了基础,用Luttinger-Ward的介子展开方法,给出了URu_2Si_2弱磁性的反常性质,并将其解释为f^2-的晶场单重基态的矩诱导机制的U离子的配置以及费米面的一部分的嵌套效应。特别地,自然地导出了Neel温度T_N和T=0时的有序矩m(0)与磁场的关系,它们与明显不同的磁场大小成比例关系。少
项目成果
期刊论文数量(18)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
T.Tsuji, O.Narikiyo, and K.Miyake: "Doping Dependence of Hole-Number Distribution on CuO_2 Plane and Superconducting Transition Temperature of High-T_c Cuprates by d_<xy>-Pairing Scenario" Physica C. Vol.244. 311-320 (1995)
T.Tsuji、O.Narikiyo 和 K.Miyake:“CuO_2 平面上的孔数分布的掺杂依赖性和高 T_c 铜氧化物的超导转变温度(通过 d_<xy>-配对场景)”Physica C. Vol.244。
- DOI:
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- 影响因子:0
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Y.Onishi: "Resonance State Localized around Nonmagnetic Impurity with Unitarity Scattering in Two-Dimensional d-Wave Superconductor" J.of Phys.Soc.Jpn.65. 675-678 (1996)
Y.Onishi:“二维 d 波超导体中具有单位性散射的非磁性杂质周围的共振态”J.of Phys.Soc.Jpn.65。
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- 影响因子:0
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H.Kusunose: "Two-Channel Kondo Model as a Fixed Point of Local Electron-Phonon Coupling System" Journal of the Physical Society of Japan. 65. 3032-3042 (1996)
H.Kusunose:“作为局域电子声子耦合系统定点的双通道近藤模型”日本物理学会杂志。
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- 影响因子:0
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K.Miyake and O.Narikiyo: "Note on Interpretation of Gap Anisotropy Measured by Angle-Resolved Photoemission Spectroscopy in Bi_2Sr_2CaCu_2O_<8+delta>" J.Phys.Soc.Jpn.Vol.64. 1040-1041 (1995)
K.Miyake 和 O.Narikiyo:“Bi_2Sr_2CaCu_2O_<8 delta> 角度分辨光电发射光谱测量间隙各向异性的解释说明”J.Phys.Soc.Jpn.Vol.64。
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- 影响因子:0
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I.Kuroda: "Magnetism of Single Ni-Impurity in High-Tc Cuprates" Physica B. 237-238. 103-104 (1997)
I.Kuroda:“高温铜酸盐中单一镍杂质的磁性”Physica B. 237-238。
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- 影响因子:0
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MIYAKE Kazumasa其他文献
MIYAKE Kazumasa的其他文献
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{{ truncateString('MIYAKE Kazumasa', 18)}}的其他基金
Development of New Theory for Fermi Superfluidity
费米超流新理论的发展
- 批准号:
19340099 - 财政年份:2007
- 资助金额:
$ 1.28万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Theory for New Mechanism of Superconductivity with Repulsive Origin and Local Quantum Critical Phenomena
排斥起源和局域量子临界现象的超导新机制理论
- 批准号:
16340103 - 财政年份:2004
- 资助金额:
$ 1.28万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Chemopreventive action to gastric cancer by selective cox-2 inhibitor coutribution of cox-1 inhibitor
选择性cox-2抑制剂与cox-1抑制剂联合对胃癌的化学预防作用
- 批准号:
14570519 - 财政年份:2002
- 资助金额:
$ 1.28万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
analysis of cytoprotection by COX-2 induced in gastric mucosa : influence by selective COX-2 inhibitors
COX-2 在胃粘膜中诱导的细胞保护分析:选择性 COX-2 抑制剂的影响
- 批准号:
12670526 - 财政年份:2000
- 资助金额:
$ 1.28万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
Strongly Correlated Electron Phase under Multiple Environment
多环境下强相关电子相位
- 批准号:
10CE2004 - 财政年份:1998
- 资助金额:
$ 1.28万 - 项目类别:
Grant-in-Aid for COE Research
Theoretical Study of Exotic Superconductivity and Magnetism
奇异超导与磁性的理论研究
- 批准号:
04640369 - 财政年份:1992
- 资助金额:
$ 1.28万 - 项目类别:
Grant-in-Aid for General Scientific Research (C)