Abstract
Taking simultaneously into account the electron-injected current from one normal-metal(N) electrode and the hole-injected current from the other N electrode, we study thecoherent tunnelling conductance and quantum interference effects in N/d-wavesuperconductor (S)/N double tunnel junctions. It is found that oscillations of allquasiparticle transport coefficients and the conductance spectrum with quasiparticle energyand thickness of the d-wave S depend to a great extent on the crystal orientation of thed-wave S. The zero-bias conductance peak is gradually lowered with increasing barrierstrength and/or temperature, its magnitude exhibiting damped oscillatory behaviour withthickness of S.
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