Pairing correlation functions in the triangular t−J model: d-wave and f-wave superconductivity
Takashi Koretsune, Masao Ogata
DOI 10.1103/PhysRevB.72.134513 · Physical Review B
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Abstract
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, NaxCoO2∙yH2O, is discussed.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| NaxCoO2.yH2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| NaxCoO2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| θ-(DIETS)2[Au(CN)4] Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.6 | 1 GPa | unknown |
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