Metal-insulator transition of correlated systems and origin of unusual metal

Masatoshi Imada*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

65 Citations (Scopus)


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 v<1/2 and the dynamical exponent z<2 is derived, which is in contrast to the transition to the band insulator characterized by v=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.

Original languageEnglish
Pages (from-to)2954-2969
Number of pages16
Journaljournal of the physical society of japan
Issue number8
Publication statusPublished - 1995 Aug
Externally publishedYes


  • Anomalous metal
  • Antiferromagnetic transition
  • Critical
  • Exponents
  • Hyperscaling
  • Mass divergence
  • Metal-insulator transition
  • Mott transition
  • Scaling theory

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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