Pairing correlation functions in the triangular t-J model: d-wave and f-wave superconductivity

Takashi Koretsune, Masao Ogata

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12 Citations (Scopus)


Equal-time pairing correlation functions of the two-dimensional t-J model on the triangular lattice are studied using high-temperature expansions method. We calculate the pairing correlation lengths and the effective pairing interactions down to T∼0.2t, and find the growth of pairing correlations. When t>0 with hole doping, a rapid growth of effective d-wave pairing interaction is found that indicates the resonating-valence-bond superconductivity. In contrast, when t<0, where the ferromagnetic correlation and antiferromagnetic correlation compete, correlation lengths of triplet pairings as well as d-wave pairing grow at low temperatures, although they do not diverge for T→0 in the competing region, i.e., near half-filling. On the other hand, around n=0.4, f-wave pairing correlation tends to diverge, although its effective interaction is small. Relation of the present study to the recently discovered superconductor, NaxCoO2yH2O, is discussed.

Original languageEnglish
Article number134513
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number13
Publication statusPublished - 2005 Oct 1


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