Distinct doping dependences of the pseudogap and superconducting gap of La2−xSrxCuO4 cuprate superconductors
M. Hashimoto, T. Yoshida, K. Tanaka, A. Fujimori, M. Okusawa, S. Wakimoto, K. Yamada, T. Kakeshita, H. Eisaki, S. Uchida
DOI 10.1103/PhysRevB.75.140503 · Physical Review B
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Abstract
We have performed a temperature-dependent angle-integrated photoemission study of La2−xSrxCuO4 covering from lightly doped to heavily overdoped regions and oxygen-doped La2CuO4.10. The superconducting gap energy Δsc was found to remain small for decreasing hole concentration while the pseudogap energy Δ* and temperature T* increase. The different behaviors of the superconducting gap and the pseudogap can be explained if the superconducting gap opens only on the Fermi arc around the nodal (0,0)−(π,π) direction while the pseudogap opens around ∼(π,0). The results suggest that the pseudogap and the superconducting gap have different microscopic origins.
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. | 25 | Pressure not reported | unknown |
| La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 38 | Pressure not reported | unknown |
| La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 28 | Pressure not reported | unknown |
| La2CuO4.10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 35 | Pressure not reported | unknown |
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