Fermi-surface evolution and pseudogap symmetry in n-type cuprate superconductors
Y. Zhou, H. Q. Lin, C. D. Gong
DOI 10.1103/PhysRevB.77.092510 · Physical Review B
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Abstract
Based on a doping dependent t−t′−t″−J Hamiltonian, the pseudogap and the structure of the Fermi surface are studied as a function of electron doping. No extra adjustable parameter is introduced and no gap associated order parameter is preassumed. The evolution from the small electron pocket centered at (π,0) to the large holelike Fermi surface centered at (π,π) upon increasing the doping level is revealed. A clear flat region near the hot spot is formed, which accounts for the opening of the pseudogap. Both the position and the magnitude of this pseudogap are consistent with the experiments. The influence of the pseudogap on the measured superconducting gap and difference between the electron- and hole-doped cuprates are also discussed.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nd2-xCexCuO4±δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Pr1-xLaCexCuO4-y 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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