Metal-Insulator Transition of Correlated Systems and Origin of Unusual Metal
Metal-Insulator Transition of Correlated Systems and Origin of Unusual Metal
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相关系统的金属-绝缘体转变和异常金属的起源
DOI：
10.1143/jpsj.64.2954
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发表时间：
1995
影响因子：
1.7
通讯作者：
M. Imada
中科院分区：
文献类型：
--
作者：
M. Imada
根据量子临界现象，用标度理论分析了清洁系统中Mott绝缘体与金属之间的跃迁。在一般过渡由填充控制的情况下，通过分析Drude重量和基于超标度的可压缩性，建立了标度理论。在向Mott绝缘层的转变中，得到了一个新的普适性类，其关联长度指数为ν2，与ν=1/2和z=2的带状绝缘层转变相反。这种反常指数导致了Mott绝缘层附近金属的各种反常特征，如简并温度的强烈抑制，以及德鲁德重量与掺杂浓度的非线性关系。在比热、压缩系数和自旋关联中也发现了显著的性质。从抑制相干释放的角度讨论了高温超导电性的机制。
Transitions between the Mott insulator and metals in clean systems are analyzed with the scaling theory in terms of quantum critical phenomena. In the case of generic transitions controlled by the filling, the scaling theory is established from analyses of the Drude weight and the compressibility based on hyperscaling. In the transition to the Mott insulator, a new universality class with the correlation length exponent ν 2 is derived, which is in contrast to the transition to the band insulator characterized by ν=1/2 and z =2. The unusual exponents lead to various anomalous characters of metals near the Mott insulator such as strong suppression of the degeneracy temperature, and nonlinear dependence of the Drude weight on the doping concentration. Remarkable properties are also found in the specific heat, the compressibility and spin correlations. A mechanism of high temperature superconductivity is discussed in terms of the release from the suppressed coherence.
影响因子：
8.6
作者：
TOKURA, Y;TAGUCHI, Y;IYE, Y
通讯作者：
IYE, Y
影响因子：
8.6
作者：
ABRAHAMS, E;ANDERSON, PW;RAMAKRISHNAN, TV
通讯作者：
RAMAKRISHNAN, TV