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Proximity effect and strong coupling superconductivity in nanostructures built with an STM

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arxiv cond-mat/0111365 v1 pith:EMDVSGXB submitted 2001-11-20 cond-mat.supr-con cond-mat.mes-hall

Proximity effect and strong coupling superconductivity in nanostructures built with an STM

classification cond-mat.supr-con cond-mat.mes-hall
keywords tunnelingbuiltconductancefieldslengthmagneticnanostructuresphonon
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We present high resolution tunneling spectroscopy data at very low temperatures on superconducting nanostructures of lead built with an STM. By applying magnetic fields, superconductivity is restricted to length scales of the order of the coherence length. We measure the tunneling conductance and analyze the phonon structure and the low energy DOS. We demonstrate the influence of the geometry of the system on the magnetic field dependence of the tunneling density of states, which is gapless in a large range of fields. The behavior of the features in the tunneling conductance associated to phonon modes are explained within current models.

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