Current-Voltage Relations in d-wave Josephson Junctions: Effects of Midgap Interface States

Details Current-Voltage Relations in d-wave Josephson Junctions: Effects of Midgap Interface States Current-Voltage Relations in d-wave Josephson Junctions: Effects of Midgap Interface States

1999-08-18

arxiv.org/abs/cond-mat/9908261v1

J. Low Temp. Phys. 117, 593 (1999).

Physics

Condensed Matter

Superconductivity

5 pages, (will appear in Journal of Low Temperature Physics, MOS-99 proceedings)

Scientific paper

We investigate the dc current-voltage characteristics of d-wave Josephson junctions, where the barrier at the interface may have arbitrary strength. Dividing the current into n-particle currents $I_n$ (n integer), we can explicitly show which physical processes are responsible for the subharmonic gap structure (SGS). For orientations where midgap states (MGS) exist, the resonances in the n-particle processes are drastically changed, giving rise to a strongly modified SGS. Introducing broadening in a phenomenological way, we show that MGS may produce a current peak near zero bias and we explain which physical processes are contributing to this peak. The agreement of our theory with recent experiments is discussed.

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