Pseudogap formed from preformed pairs in the organic superconductors κ‐(BEDT‐TTF)2X
Xiao-Shan Ye, Na Xu, Jian-Xin Li
DOI 10.1103/PhysRevB.70.134521 · Physical Review B
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Abstract
We study the pseudogap phenomenon of layered organic compounds κ‐(BEDT‐TTF)2X based on the scenario of preformed pairs. By solving self-consistently the closed equations of the T-matrix in the “pair approximation” scheme, we calculate the spectral function of electrons in a two-dimensional anisotropic triangular model at half-filling for dx2−y2- and dxy-wave attractive potentials, respectively. We find that a pseudogap occurs in the intermediate coupling region in the normal state and it opens up highly anisotropically in the momentum space. In particular, the momentum region where it appear first is quite different for both attractive potentials.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| κ-(BEDT-TTF)2X Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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