Marginal quantum criticality of metal-insulator transitions

Takahiro Misawa, Youhei Yamaji, Masatoshi Imada

Research output: Contribution to journalArticle

Abstract

Critical exponents of metal-insulator transitions are studied for an extended Hubbard model within the Hartree-Fock approximation. At zero temperature, we find that the first-order transition line between a symmetry broken (antiferromagnetic or charge-ordered) metal and an insulator terminates at the "marginally quantum critical point", where an unconventional universality class emerges. This universality is in agreement with the scaling theory and explains the exponents obtained by recent experiments on (V, Cr)2 O3 and κ-(ET)2 Cu (Cn)2 Cl in a unified way as a crossover from the marginally quantum universality and the Ising universality.

Original languageEnglish
Pages (from-to)925-927
Number of pages3
JournalJournal of Magnetism and Magnetic Materials
Volume310
Issue number2 SUPPL. PART 1
DOIs
Publication statusPublished - 2007 Mar 1
Externally publishedYes

Keywords

  • Metal-insulator transitions
  • Mott transition
  • Quantum critical phenomena

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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