Subsurface correlations in the d-wave Josephson junction

A. B. Kuklov

doi:10.1103/PhysRevB.52.6729

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Subsurface correlations in the d-wave Josephson junction

A. B. Kuklov

DOI 10.1103/PhysRevB.52.6729 · Physical Review B

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Abstract

A prediction is made for the Josephson vortex structure in the d-wave Josephson junction (JJ) for those (special) orientations of the JJ insulating plane when the critical current is expected to be suppressed significantly (or zero) in accordance with the dx2-y2 symmetry. It is shown that a spontaneous admixture of the dxy wave function in the vicinity of the JJ insulating plane makes the critical current be finite. A conventional magnetic vortex in such a d-wave uniform and plane JJ, demonstrating no time-reversal symmetry breaking, splits into two parts, each carrying half of the magnetic flux. The explicit solution for such a pair as well as the lower critical field are obtained. The pair size diverges logarithmically as soon as the JJ orientation approaches the special one. Possible ways of experimental observation of this effect are discussed.