Origin of the Extended Van Hove region in Cuprate Superconductors
Wei-Guo Yin, Chang-De Gong, P. W. Leung
DOI 10.1103/PhysRevLett.81.2534 · Physical Review Letters
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Abstract
We study the evolution of the quasiparticle dispersion with doping for the two-dimensional t−t′−t′′−J model using the exact diagonalization technique and present a consistent theoretical analysis. Both calculations show that the flat region around (π,0) does not exist at half filling, however, it appears in the underdoped regime and remains almost unchanged upon additional doping. The enhancement of the incoherent motion of holes induced especially by the t′ and t′′ terms accounts for the formation of the extended Van Hove region. Our results are in excellent agreement with the recent photoemission experiments on Bi2Sr2Ca1−xDyxCu2O8+δ [Marshall et al., Phys. Rev. Lett. 76, 4841 (1996)].
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2Ca1-xDyxCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8-δ 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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