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

^*Corresponding author for this work

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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10.1016/j.jmmm.2006.10.526

Cite this

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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.",

keywords = "Metal-insulator transitions, Mott transition, Quantum critical phenomena",

author = "Takahiro Misawa and Youhei Yamaji and Masatoshi Imada",

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T1 - Marginal quantum criticality of metal-insulator transitions

AU - Misawa, Takahiro

AU - Yamaji, Youhei

AU - Imada, Masatoshi

PY - 2007/3/1

Y1 - 2007/3/1

N2 - 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.

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.

KW - Metal-insulator transitions

KW - Mott transition

KW - Quantum critical phenomena

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DO - 10.1016/j.jmmm.2006.10.526

M3 - Article

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EP - 927

JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

SN - 0304-8853

IS - 2 SUPPL. PART 1

ER -

Marginal quantum criticality of metal-insulator transitions

Abstract

Keywords

ASJC Scopus subject areas

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