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Effect of increasing disorder on superconductivity of Mo/Nb superlattices

Pereiro, Juan, Saerbeck, Thomas and Schuller, Ivan K. 2015. Effect of increasing disorder on superconductivity of Mo/Nb superlattices. Superconductor Science and Technology 28 (8) , 085001. 10.1088/0953-2048/28/8/085001

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Abstract

We investigated the superconducting properties of Nb/Mo superlattices (SLs). The structural changes as a function of Nb and Mo layer thickness allow us to investigate the effect of disorder on the superconducting properties in a controlled fashion. Systematic structural studies provide quantitative measures of disorder parameters, such as roughness, interdiffusion, and strain, which allow separating their effect on the individual superconducting layers. The Mo critical temperature does not change as the layer thickness decreases below its coherence length. Thus, the SL critical temperatures in the presence of disorder and proximity effects can be modeled by considering only the effects of the Nb mean free path and coherence length. With increasing layer thickness, the SL critical temperatures approach Nb bulk values. Contrary to expectations the Tc of Mo remains below the Nb Tc. We discuss the results using existing theories based on Coulomb repulsion or changes in the density of states at the Fermi surface as a function of disorder. Questions about current understanding of the effect of disorder on superconductivity arise from the results.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QC Physics
Publisher: IOP Publishing
ISSN: 0953-2048
Funders: Air force for scientific research
Date of Acceptance: 23 May 2015
Last Modified: 04 May 2020 16:30
URI: http://orca.cf.ac.uk/id/eprint/75689

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