TY - JOUR
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
Y1 - 2006/1
N2 - 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.
AB - 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.
KW - A. Superconductors
KW - D. Electrical properties
KW - D. Superconductivity
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U2 - 10.1016/j.jpcs.2005.10.111
DO - 10.1016/j.jpcs.2005.10.111
M3 - Article
AN - SCOPUS:33645034210
SN - 0022-3697
VL - 67
SP - 95
EP - 98
JO - Journal of Physics and Chemistry of Solids
JF - Journal of Physics and Chemistry of Solids
IS - 1-3
ER -