Superconducting energy gap in Bi1.8Pb0.4Sr2Ca2Cu3O10+δ studied by photoemission spectroscopy
C. Gu, B. W. Veal, R. Liu, A. P. Paulikas, P. Kostic, H. Ding, J. C. Campuzano, B. A. Andrews, R. I. R. Blyth, A. J. Arko, P. Manuel, D. Y. Kaufman, M. T. Lanagan
DOI 10.1103/PhysRevB.51.1397 · Physical Review B
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Abstract
We report photoemission measurements on highly textured polycrystalline samples of Bi1.8Pb0.4Sr2Ca2Cu3O10+δ (Bi-2223, Tc=104 K). High-resolution data show a superconducting gap opening below Tc. The gap-spectrum line shape suggests an anisotropic gap structure in the Brillouin zone. The maximum gap in Bi-2223 is estimated to be 29 meV so that 2Δ/kTc∼6.5, somewhat larger than the reduced gap in Bi2Sr2CaCu2O8 (Bi-2212). A spectral dip feature is observed at 72 meV in the superconducting state. The results are compared with angle-resolved experiments on Bi-2212 single crystals.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi1.8Pb0.4Sr2Ca2Cu3O10+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 104 | Pressure unresolved | onset |
| Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 85 | Pressure not reported | unknown |
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