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Superconductivity in a disordered metal with Coulomb interactions

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arxiv 2003.01763 v2 pith:ERDKDMEM submitted 2020-03-03 cond-mat.supr-con cond-mat.mes-hallcond-mat.str-el

Svetlana V. Postolova , Alexey Yu. Mironov , Víctor Barrena , Jose Benito-Llorens , Jose Gabriel Rodrigo , Hermann Suderow , Mikhail R. Baklanov , Tatyana I. Baturina
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Valerii M. Vinokur
This is my paper · ORCID
classification cond-mat.supr-concond-mat.mes-hallcond-mat.str-el
keywords disorderednormalcoulombinteractionsphasesuperconductingapplyingdecreases
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We study the electronic densities of states (DOS) of strongly disordered superconducting thin films of TiN. We find, using Scanning Tunneling Microscopy (STM) that the DOS decreases towards the Fermi level in the normal phase obtained by applying magnetic fields. The DOS shows spatial fluctuations whose length scale is related to the energy dependent DOS and is similar in normal and superconducting phases. This suggests that Coulomb interactions lead to a spatially varying DOS in the normal phase of a disordered superconductor.

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