Transport properties of bi-epitaxial YBa2Cu3O7−δ grain boundary Josephson junctions: Experimental evidence of a subdominant superconducting phase

Simon K. H. Lam; Sabaratnasingam Gnanarajan

doi:10.1103/PhysRevB.78.094521

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Transport properties of bi-epitaxial YBa2Cu3O7−δ grain boundary Josephson junctions: Experimental evidence of a subdominant superconducting phase

Simon K. H. Lam, Sabaratnasingam Gnanarajan

DOI 10.1103/PhysRevB.78.094521 · Physical Review B

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Abstract

We present the fabrication of a 45° [001] tilted asymmetrical bi-epitaxial YBa2Cu3O7−δ grain boundary Josephson junction using yttria-stabilized zirconia as the seed layer. The magnetic-field dependence of the critical current, Ic(B), of these junctions was measured over a wide range of temperatures. Significant asymmetry of the Ic(B) with respect to the magnetic-field polarity was observed at low temperatures. Our measured results are compared with theoretical predictions of Josephson-junction behavior based on d-wave superconducting electrodes with the onset of a subdominant symmetry component. We estimate an imaginary subdominant symmetry greater than 20% to the d wave.

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
Bi2Sr2Ca1Cu2O8+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown