Marginal quantum criticality of metal-insulator transitions

Takahiro Misawa; Youhei Yamaji; Masatoshi Imada

doi:10.1016/j.jmmm.2006.10.526

Marginal quantum criticality of metal-insulator transitions

Takahiro Misawa, Youhei Yamaji, Masatoshi Imada

Research output: Contribution to journal › Article › peer-review

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 language	English
Pages (from-to)	925-927
Number of pages	3
Journal	Journal of Magnetism and Magnetic Materials
Volume	310
Issue number	2 SUPPL. PART 1
DOIs	https://doi.org/10.1016/j.jmmm.2006.10.526
Publication status	Published - 2007 Mar 1
Externally published	Yes

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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title = "Marginal quantum criticality of metal-insulator transitions",

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.",

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AU - Yamaji, Youhei

AU - Imada, Masatoshi

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AB - 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.

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