Intrinsic Josephson effects in high-Tc superconductors

R. Kleiner; P. Müller

doi:10.1103/PhysRevB.49.1327

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Intrinsic Josephson effects in high-Tc superconductors

R. Kleiner, P. Müller

DOI 10.1103/PhysRevB.49.1327 · Physical Review B

T1

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Abstract

We have investigated the coupling between CuO2 layers in high-Tc superconductors by direct measurements of all dc and ac Josephson effects with current flow in the c-axis direction. The measurements have been performed on small single crystals of Bi2Sr2CaCu2O8, (PbyBi1−y)2Sr2CaCu2O8, Tl2Ba2Ca2Cu3O10, and YBa2Cu3O7−x and on a-axis-oriented YBa2Cu2O7 thin films. The results clearly show that all materials behave like stacks of superconductor-insulator-superconductor Josephson junctions. The current-voltage characteristics exhibit large hystereses and multiple branches, which can be explained by a series connection of highly capacitive junctions. From the modulation of the critical current in a magnetic field parallel to the layers, we infer a junction thickness of approximately 15 Å. In our microwave emission experiments we were able to prove explicitly that every pair of CuO2 double or triple layers forms a working Josephson contact. An exception is YBa2Cu3O7, where only flux-flow behavior has been observed.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
(PbYBi1-y)2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Tl2Ba2Ca2Cu3O10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
YBa2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
YBa2Cu2O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown