Josephson effect in the cuprates: microscopic implications
Hlubina, R.
Original · EN
In the tunnel limit, the current-phase relation of Josephson junctions can be expanded as I(ϕ)=I₁ϕ+I₂ 2ϕ. Standard BCS theory predicts that I₁Rₙ Δ/e and I₂/I₁ D, where Rₙ is the resistance of the junction in the normal state, Δ is the superconducting gap, and D≪ 1 is the junction transparency. In the cuprates, the experimental value of I₁Rₙ (I₂/I₁) is much smaller (larger) than the BCS prediction. We argue that both peculiarities of the cuprates can be explained by postulating quantum fluctuations of the pairing symmetry.
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