Phase-coherent conduction in mesoscopic normal-metal/superconductor hybrid junctions

N. Kim, H. J. Lee, J. J. Kim, J. O. Lee, J. W. Park, K. H. Yoo, S. Lee, K. W. Park

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

In this paper we report about the transport properties of mesoscopic normal-metal/superconductor (NS) hybrid systems with two different junction layouts. One is a junction fabricated by overlaying S on N wire and the other with S sandwiched between two N wires, forming an NSN structure. At zero bias all the junctions exhibited a sharp decrease of dV/dI, which is believed to arise from the interference between the disorder-scattered and the Andreev-reflected quasiparticles. A small magnetic field corresponding to one flux quantum through the normal metal region, applied in parallel with the NS junction, easily suppressed the anomalous zero-bias conductance enhancement for the sandwich-junction sample. This high sensitivity to a small magnetic field observed in our systems of mesoscopic NS junctions in a diffusive-transport regime directly confirms the electron-hole-interference origin of the zero-bias anomaly.

Original languageEnglish
Pages (from-to)29-34
Number of pages6
JournalSolid State Communications
Volume115
Issue number1
DOIs
Publication statusPublished - 2000 May 30

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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