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

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

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1 Citation (Scopus)


With NaxCoO2·yH2O 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 languageEnglish
Pages (from-to)95-98
Number of pages4
JournalJournal of Physics and Chemistry of Solids
Issue number1-3
Publication statusPublished - 2006 Jan


  • A. Superconductors
  • D. Electrical properties
  • D. Superconductivity


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