Portal de Periódicos da CAPES

Proximity Effects in Quench-Condensed Granular Superconductors and Ferromagnets

2000; Wiley; Volume: 218; Issue: 1 Linguagem: Inglês

10.1002/(sici)1521-3951(200003)218

1521-3951

A. Frydman, L. M. Merchant, R. C. Dynes,

Theoretical and Computational Physics

We report on a study of proximity effects in quench-condensed superconducting (Pb) and ferromagnetic (Ni) granular films in which we are able to deposit sequential layers of material and measure transport and magnetoresistance properties in-situ for different degrees of material coverage. We find that adding a normal (non-superconducting or non-ferromagnetic) overlayer to isolated Pb or Ni grains enhances long-range order in the film. We interpret these results as being due to proximity effects where the grains are coupled via the weak order-parameter induced in the overlayer material.