Evidence for Scattering-Dependent Multigap Superconductivity in Ba8Si46

Details Evidence for Scattering-Dependent Multigap Superconductivity in Ba8Si46 Evidence for Scattering-Dependent Multigap Superconductivity in Ba8Si46

2010-02-19

arxiv.org/abs/1002.3695v1

Physics

Condensed Matter

Superconductivity

5 pages, 3 figures

Scientific paper

We have studied the quasiparticle excitation spectrum of the superconductor Ba8Si46 by local tunneling spectroscopy. Using high energy resolution achieved in Superconductor-Superconductor junctions we observed tunneling conductance spectra of a non-conventional shape revealing two distinct energy gaps, DeltaL = 1.3meV and DeltaS = 0.9meV. The analysis of tunneling data evidenced that DeltaL is the principal superconducting gap while DeltaS, smaller and more dispersive, is induced into an intrinsically non-superconducting band of the material by the inter-band quasiparticle scattering.

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