Measurements of the anisotropy and temperature dependence of the in-plane energy gap in YBa2Cu3O7−δ using Andreev reflections

E. Polturak; G. Koren; D. Cohen; E. Aharoni

doi:10.1103/PhysRevB.47.5270

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Measurements of the anisotropy and temperature dependence of the in-plane energy gap in YBa2Cu3O7−δ using Andreev reflections

E. Polturak, G. Koren, D. Cohen, E. Aharoni

DOI 10.1103/PhysRevB.47.5270 · Physical Review B

T1

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Abstract

We report measurements of the differential resistance of (YBa2Cu2O7−δ)–normal-metal– (YBa2Cu3O7−δ) edge Josephson junctions. We interpret the observed features as arising from Andreev reflections, and deduce the temperature dependence and the anisotropy of the in-plane energy gap. We find 2Δb/kTc=4.2 and 2Δa/kTc=6.2. In addition, we discuss features at eV>2Δ, which appear at harmonics of the gap, and which we interpret as arising from the presence of correlated phase-slip centers near the junction.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown