Tunneling spectroscopy with intrinsic Josephson junctions in Bi2Sr2CaCu2O8+δ and Tl2Ba2Ca2Cu3O10+δ
K. Schlenga, R. Kleiner, G. Hechtfischer, M. Mößle, S. Schmitt, Paul Müller, Ch. Helm, Ch. Preis, F. Forsthofer, J. Keller, H. L. Johnson, M. Veith, E. Steinbeiß
DOI 10.1103/PhysRevB.57.14518 · Physical Review B
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Abstract
The paper presents a detailed discussion of the current-voltage characteristic of intrinsic Josephson junctions in Bi2Sr2CaCu2O8+δ and Tl2Ba2Ca2Cu3O10+δ. In these materials Josephson tunnel junctions are formed naturally between adjacent superconducting CuO2 bilayers or trilayers. A typical sample consists of a stack of Josephson junctions. We explicitly show that all junctions inside a given sample have identical tunneling characteristics. We discuss the shape (general curvature) of the current-voltage characteristic in terms of a superconducting order parameter that has a predominant dx2−y2 symmetry. The IcRn product of the intrinsic Josephson junctions turns out to be 2–3 mV, about 10% of the maximum energy gap Δ0/e. The current-voltage characteristic of every individual junction exhibits pronounced structures in the subgap regime. They are best explained by a recently proposed resonant coupling mechanism between infrared active optical c-axis phonons and oscillating Josephson currents.
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. | — | Pressure not reported | unknown |
| Tl2Ba2Ca2Cu3O10+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 115 | Pressure not reported | onset |
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