Dominant antiferromagnetism in the Hubbard model on anisotropic triangular lattices

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

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

With κ - (BEDT - TTF)2 X in mind, we study a half-filled-band Hubbard model on an anisotropic triangular lattice, using an optimization variational Monte Carlo method. As a trial function, we use a state having antiferromagnetic (AF) and d-wave singlet gaps simultaneously, and allow for a band renormalization effect in it. It is found that, at a fairy small value of U / t, a first-order conductor-to-AF insulator transition takes place even for remarkably large strength of frustration. In the optimized insulating states, the staggered magnetization is always robust, even for fully frustrated case. Thereby, a regime of robust superconductor as well as of a nonmagnetic insulator vanishes in this wave function.

Original languageEnglish
Pages (from-to)648-650
Number of pages3
JournalJournal of Magnetism and Magnetic Materials
Volume310
Issue number2 SUPPL. PART 1
DOIs
Publication statusPublished - 2007 Mar 1

Keywords

  • Anisotropic triangular lattice
  • Hubbard model
  • Mott transition

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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