Paraconductivity of granular Al films at high reduced temperatures and magnetic fields - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Physical Review B Année : 2019

Paraconductivity of granular Al films at high reduced temperatures and magnetic fields

Résumé

The electrical conductivity induced near the superconducting transition by thermal fluctuations was measured in different granular aluminum films. The seemingly anomalous behavior at high reduced temperatures and magnetic fields is explained by taking into account a total-energy cutoff in the superconducting fluctuation spectrum in both the direct (Aslamazov-Larkin) and the indirect (anomalous Maki-Thompson) contributions to the fluctuation effects. The analysis allowed a reliable determination of the coherence length amplitudes, which resulted to be much larger (20-48 nm) than the grains size (5-10 nm). This suggests that the grains are strongly Josephson-coupled, while the T c value is still as high as twice the bulk value. These results could contribute to identifying the mechanisms enhancing T c in these materials.
Fichier principal
Vignette du fichier
PRB2019_FluctGranAl.pdf (1.13 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-02361512 , version 1 (13-11-2019)

Identifiants

Citer

D Sóñora, C Carballeira, J J Ponte, F. Vidal, T. Grenet, et al.. Paraconductivity of granular Al films at high reduced temperatures and magnetic fields. Physical Review B, 2019, 100 (10), pp.104509. ⟨10.1103/PhysRevB.100.104509⟩. ⟨hal-02361512⟩

Collections

UGA CNRS NEEL
18 Consultations
91 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More