Josephson effect in the cuprates: microscopic implications

Details Josephson effect in the cuprates: microscopic implications Josephson effect in the cuprates: microscopic implications

2002-10-23

arxiv.org/abs/cond-mat/0210516v1

Physics

Condensed Matter

Superconductivity

NATO ARW Concepts in Electron Correlation, Sep. 29-Oct. 3, Hvar, Croatia

Scientific paper

In the tunnel limit, the current-phase relation of Josephson junctions can be expanded as $I(\phi)=I_1\sin\phi+I_2\sin 2\phi$. Standard BCS theory predicts that $I_1R_N\sim\Delta/e$ and $I_2/I_1\sim D$, where $R_N$ is the resistance of the junction in the normal state, $\Delta$ is the superconducting gap, and $D\ll 1$ is the junction transparency. In the cuprates, the experimental value of $I_1R_N$ ($I_2/I_1$) 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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