Pairing symmetry and ferromagnetism in the t-J model on a triangular lattice

Tsutomu Watanabe; Hisatoshi Yokoyama; Yukio Tanaka; Jun Ichiro Inoue; Masao Ogata

doi:10.1016/j.jpcs.2005.10.111

Pairing symmetry and ferromagnetism in the t-J model on a triangular lattice

Tsutomu Watanabe, Hisatoshi Yokoyama, Yukio Tanaka, Jun Ichiro Inoue, Masao Ogata

SCI - Physics

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

1 Citation (Scopus)

Abstract

With Na _x CoO ₂ ·yH ₂ O in mind, a single-band t-J model on a triangular lattice is studied, using a variational Monte Carlo method. It is found that among various superconducting symmetries, a d+id wave is the most stable for any hole density δ, and irrespective of the sign of hopping integral t; a simple d wave, however, has a fairly close energy. Triplet superconductivity is not realized. For t<0, Nagaoka ferromagnetism is dominant in a wide range of δ and J/|t|, which eliminates the possibility of superconductivity for realistic model parameters.

Original language	English
Pages (from-to)	95-98
Number of pages	4
Journal	Journal of Physics and Chemistry of Solids
Volume	67
Issue number	1-3
DOIs	https://doi.org/10.1016/j.jpcs.2005.10.111
Publication status	Published - 2006 Jan 1

Keywords

A. Superconductors
D. Electrical properties
D. Superconductivity

ASJC Scopus subject areas

Chemistry(all)
Materials Science(all)
Condensed Matter Physics

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title = "Pairing symmetry and ferromagnetism in the t-J model on a triangular lattice",

abstract = " With Na x CoO 2 ·yH 2 O in mind, a single-band t-J model on a triangular lattice is studied, using a variational Monte Carlo method. It is found that among various superconducting symmetries, a d+id wave is the most stable for any hole density δ, and irrespective of the sign of hopping integral t; a simple d wave, however, has a fairly close energy. Triplet superconductivity is not realized. For t<0, Nagaoka ferromagnetism is dominant in a wide range of δ and J/|t|, which eliminates the possibility of superconductivity for realistic model parameters.",

keywords = "A. Superconductors, D. Electrical properties, D. Superconductivity",

author = "Tsutomu Watanabe and Hisatoshi Yokoyama and Yukio Tanaka and Inoue, {Jun Ichiro} and Masao Ogata",

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T1 - Pairing symmetry and ferromagnetism in the t-J model on a triangular lattice

AU - Watanabe, Tsutomu

AU - Yokoyama, Hisatoshi

AU - Tanaka, Yukio

AU - Inoue, Jun Ichiro

AU - Ogata, Masao

PY - 2006/1/1

Y1 - 2006/1/1

N2 - With Na x CoO 2 ·yH 2 O in mind, a single-band t-J model on a triangular lattice is studied, using a variational Monte Carlo method. It is found that among various superconducting symmetries, a d+id wave is the most stable for any hole density δ, and irrespective of the sign of hopping integral t; a simple d wave, however, has a fairly close energy. Triplet superconductivity is not realized. For t<0, Nagaoka ferromagnetism is dominant in a wide range of δ and J/|t|, which eliminates the possibility of superconductivity for realistic model parameters.

AB - With Na x CoO 2 ·yH 2 O in mind, a single-band t-J model on a triangular lattice is studied, using a variational Monte Carlo method. It is found that among various superconducting symmetries, a d+id wave is the most stable for any hole density δ, and irrespective of the sign of hopping integral t; a simple d wave, however, has a fairly close energy. Triplet superconductivity is not realized. For t<0, Nagaoka ferromagnetism is dominant in a wide range of δ and J/|t|, which eliminates the possibility of superconductivity for realistic model parameters.

KW - A. Superconductors

KW - D. Electrical properties

KW - D. Superconductivity

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