Effects of next-nearest-neighbor hopping t′ on the electronic structure of cuprate superconductors
K. Tanaka, T. Yoshida, A. Fujimori, D. H. Lu, Z.-X. Shen, X.-J. Zhou, H. Eisaki, Z. Hussain, S. Uchida, Y. Aiura, K. Ono, T. Sugaya, T. Mizuno, I. Terasaki
DOI 10.1103/PhysRevB.70.092503 · Physical Review B
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Abstract
Photoemission spectra of underdoped and lightly-doped Bi2−zPbzSr2Ca1−xRxCu2O8+y (R=Pr, Er) (BSCCO) have been measured and compared with those of La2−xSrxCuO4 (LSCO). The lower-Hubbard band of the insulating BSCCO, like Ca2CuO2Cl2, shows a stronger dispersion than La2CuO4 from k∼(π∕2,π∕2) to ∼(π,0). The flat band at k∼(π,0) is found generally deeper in BSCCO. These observations together with the Fermi-surface shapes and the chemical potential shifts indicate that the next-nearest-neighbor hopping ∣t′∣ of the single-band model is larger in BSCCO than in LSCO and that ∣t′∣ rather than the super-exchange J influences the pseudogap energy scale.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 14 | Pressure not reported | unknown |
| La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 29 | Pressure not reported | unknown |
| La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 41 | Pressure not reported | unknown |
| La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 20 | Pressure not reported | unknown |
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