Nonmagnetic Insulating States near the Mott Transitions on Lattices with Geometrical Frustration and Implications for κ-(ET)2Cu 2(CN)3

Hidekazu Morita; Shinji Watanabe; Masatoshi Imada

doi:10.1143/JPSJ.71.2109

Nonmagnetic Insulating States near the Mott Transitions on Lattices with Geometrical Frustration and Implications for κ-(ET)₂Cu ₂(CN)₃

Hidekazu Morita^*, Shinji Watanabe, Masatoshi Imada

^*Corresponding author for this work

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

194 Citations (Scopus)

Abstract

We study phase diagrams of the Hubbard model on anisotropic triangular lattices, which also represents a model for κ-type BEDT-TTF compounds. In contrast with mean-field predictions, path-integral renormalization group calculations show a universal presence of a nonmagnetic insulator sandwiched by an antiferromagnetic insulator and paramagnetic metals. The nonmagnetic phase does not show simple translational symmetry breakings such as flux phases, implying a genuine Mott insulator. We discuss possible relevance to the nonmagnetic insulating phase found in κ-(ET)₂Cu ₂(CN)₃.

Original language	English
Pages (from-to)	2109-2112
Number of pages	4
Journal	journal of the physical society of japan
Volume	71
Issue number	9
DOIs	https://doi.org/10.1143/JPSJ.71.2109
Publication status	Published - 2002 Sept
Externally published	Yes

Keywords

Antiferromagnetic transition
BEDT-TTF compounds
Bandwidth control
Mott insulator
Mott transition
Nonmagnetic insulator
Triangular lattice

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.1143/JPSJ.71.2109

Cite this

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abstract = "We study phase diagrams of the Hubbard model on anisotropic triangular lattices, which also represents a model for κ-type BEDT-TTF compounds. In contrast with mean-field predictions, path-integral renormalization group calculations show a universal presence of a nonmagnetic insulator sandwiched by an antiferromagnetic insulator and paramagnetic metals. The nonmagnetic phase does not show simple translational symmetry breakings such as flux phases, implying a genuine Mott insulator. We discuss possible relevance to the nonmagnetic insulating phase found in κ-(ET)2Cu 2(CN)3.",

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AU - Watanabe, Shinji

AU - Imada, Masatoshi

PY - 2002/9

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N2 - We study phase diagrams of the Hubbard model on anisotropic triangular lattices, which also represents a model for κ-type BEDT-TTF compounds. In contrast with mean-field predictions, path-integral renormalization group calculations show a universal presence of a nonmagnetic insulator sandwiched by an antiferromagnetic insulator and paramagnetic metals. The nonmagnetic phase does not show simple translational symmetry breakings such as flux phases, implying a genuine Mott insulator. We discuss possible relevance to the nonmagnetic insulating phase found in κ-(ET)2Cu 2(CN)3.

AB - We study phase diagrams of the Hubbard model on anisotropic triangular lattices, which also represents a model for κ-type BEDT-TTF compounds. In contrast with mean-field predictions, path-integral renormalization group calculations show a universal presence of a nonmagnetic insulator sandwiched by an antiferromagnetic insulator and paramagnetic metals. The nonmagnetic phase does not show simple translational symmetry breakings such as flux phases, implying a genuine Mott insulator. We discuss possible relevance to the nonmagnetic insulating phase found in κ-(ET)2Cu 2(CN)3.

KW - Antiferromagnetic transition

KW - BEDT-TTF compounds

KW - Bandwidth control

KW - Mott insulator

KW - Mott transition

KW - Nonmagnetic insulator

KW - Triangular lattice

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