Doping-Induced Change in the Interlayer Transport Mechanism of Bi2Sr2CaCu2O8+δ near the Superconducting Transition Temperature
S. O. Katterwe, A. Rydh, V. M. Krasnov
DOI 10.1103/PhysRevLett.101.087003 · Physical Review Letters
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Abstract
We perform a detailed study of temperature, bias, and doping dependence of interlayer transport in the layered high temperature superconductor Bi2Sr2CaCu2O8+δ. We observe that the shape of interlayer characteristics in underdoped crystals exhibits a remarkable crossover at the superconducting transition temperature: from thermal activation-type above Tc to almost T-independent quantum tunneling-type below Tc. Our data provide insight into the nature of interlayer transport and indicate that its mechanism changes with doping: from the conventional single quasiparticle tunneling in overdoped to a progressively increasing Cooper pair contribution in underdoped crystals.
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. | 86 | Pressure not reported | onset |
| Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 94.5 | Pressure not reported | onset |
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