In-gap bound states and tunneling conductance of multiband superconductors through a normal/superconductor/superconductor junction

Details In-gap bound states and tunneling conductance of multiband superconductors through a normal/superconductor/superconductor junction In-gap bound states and tunneling conductance of multiband superconductors through a normal/superconductor/superconductor junction

2008-12-05

arxiv.org/abs/0812.1068v2

Phys. Rev B 79, 184503 (2009)

Physics

Condensed Matter

Superconductivity

5 pages, 5 figures

Scientific paper

The tunneling conductance between a metal and a multiband s-wave superconductor with a thin layer of single-band s-wave superconductor sandwiched in between is examined in this paper. We show that an in-gap peak in conductance curve is found as a result of the formation of in-gap bound state between the single-band and multiband superconductor junctions if the phases of the superconducting order parameters of the multiband superconductor are frustrated. The implication of this result in determining the gap symmetry of the iron-based superconductors is discussed.

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