Strong Dependence of the Superconducting Gap on Oxygen Doping from Tunneling Measurements on Bi2Sr2CaCu2O8−δ
N. Miyakawa, P. Guptasarma, J. F. Zasadzinski, D. G. Hinks, K. E. Gray
DOI 10.1103/PhysRevLett.80.157 · Physical Review Letters
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Abstract
Tunneling measurements are reported for break junctions on Bi2Sr2CaCu2O8−δ single crystals with various oxygen concentrations. Superconducting energy gaps Δ are observed in the underdoped samples which are considerably larger (∼30%) than found in optimal doped crystals. The trend of decreasing Δ and 2Δ/kTc with increasing hole doping is continued into the overdoped region. Thus the superconducting gap and strong-coupling ratio change monotonically and dramatically over a narrow doping region where Tc exhibits a maximum.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CaCu2O8-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 83 | Pressure not reported | onset |
| Bi2Sr2CaCu2O8-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 95 | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 82 | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 62 | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 77 | Pressure not reported | unknown |
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