Physics – Condensed Matter – Superconductivity
Scientific paper
2004-08-20
J.Phys.Soc.Jpn. 73, 3404 (2004).
Physics
Condensed Matter
Superconductivity
10 pages, 13 figures
Scientific paper
10.1143/JPSJ.73.3404
As a model of a novel superconductor Na_xCoO_2\cdotyH_2O, a single-band t-J model on a triangular lattice is studied, using a variational Monte Carlo method. We calculate the energies of various superconducting (SC) states, changing the doping rate \delta and sign of t for small J/|t|. Symmetries of s, d, and d+id (p+ip and f) waves are taken up as candidates for singlet (triplet) pairing. In addition, the possibility of Nagaoka ferromagnetism and inhomogeneous phases is considered. It is revealed that, among the SC states, the d+id wave always has the lowest energy, which result supports previous mean-field studies. There is no possibility of triplet pairing, although the f-wave state becomes stable against a normal state in a special case (\delta=0.5 and t<0). For t<0, the complete ferromagnetic state is dominant in a wide range of \delta and J/|t|, which covers the realistic parameter region of superconductivity.
Inoue Jun-ichiro
Ogata Masao
Tanaka Yukio
Watanabe Tsutomu
Yokoyama Hisatoshi
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