Strong-Coupling Behavior of the Critical Temperature of Pb/Ag, Pb/Cu and Pb/Al Nanocomposites Explained by Proximity Eliashberg Theory

Condensed Matter

article

Giovanni Alberto Ummarino¹ 

[1] Dipartimento di Scienza Applicata e Tecnologia, Istituto di Ingegneria e Fisica dei Materiali;Moscow Engineering Physics Institute, National Research Nuclear University MEPhI

关键词: nanomaterials;    superconducting materials;    proximity effect;    Eliashberg equations;   

DOI  :  10.3390/condmat8020045

学科分类：社会科学、人文和艺术（综合）

来源: mdpi

【 摘 要 】

The experimental critical temperature of the systems of superconducting (P b) and normal (A g, C u and A l) nanoparticles, with a random distribution and sizes less than their respective coherence lengths, is governed by the proximity effect, as shown by the experimental data. At first glance, the behavior of the variation in the critical temperature in function of the ratio of volume fractions of the superconducting and the normal metal components seems to suggest a weak coupling behavior for the superconductor. In reality, upon a more careful analysis, using Eliashberg’s theory for the proximity effect, the system instead shows a strong coupling nature. The most interesting thing is that the theory has no free parameters and perfectly explains the behavior of the experimental data just with the assumption in the case of the nanoparticles A g and C u, that the value of the density of states at the Fermi level of silver and copper is equal to the value of lead.

【 授权许可】

CC BY