Superconducting electronic state in optimally doped YBa2Cu3O7−δ observed with laser-excited angle-resolved photoemission spectroscopy
M. Okawa, K. Ishizaka, H. Uchiyama, H. Tadatomo, T. Masui, S. Tajima, X.-Y. Wang, C.-T. Chen, S. Watanabe, A. Chainani, T. Saitoh, S. Shin
DOI 10.1103/PhysRevB.79.144528 · Physical Review B
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Abstract
Low-energy electronic structure of optimally doped YBa2Cu3O7−δ is investigated using laser-excited angle-resolved photoemission spectroscopy. The surface state and the CuO chain band that usually overlap the CuO2 plane derived bands are not detected, thus enabling a clear observation of the bulk superconducting state. The observed bilayer splitting of the Fermi surface is ∼0.08 Å−1 along (0,0)−(π,π) direction, significantly larger than Bi2Sr2CaCu2O8+δ. The kink structure of the band dispersion reflecting the renormalization effect at ∼60 meV shows up similarly as in other hole-doped cuprates. The momentum dependence of the superconducting gap shows dx2−y2-wave-like amplitude but exhibits a nonzero minimum of ∼12 meV along the (0,0)−(π,π) direction. Possible origins of such an unexpected “nodeless” gap behavior are discussed.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 93 | 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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