Anisotropy of the coherence length from critical currents in the stoichiometric superconductor LiFeAs
Résumé
of vortex motion in the stoichiometric LiFeAs superconductor. These correspond to vortex lines along the c axis moving parallel to the ab plane, and to vortex lines in the ab plane moving perpendicular to and within the plane, respectively. The measurements were carried out in the low-field regime of strong vortex pinning, in which the critical current anisotropy is solely determined by the coherence length anisotropy parameter εξ . This allows for the extraction of εξ at magnetic fields far below the upper critical field Bc2. We find that increasing the magnetic field decreases the anisotropy of the coherence length.
Mots clés
Supraconductivité
Superconductivity
Iron-pnictides
Pnictures de fer
Superconducting vortices
Vortex supraconducteurs
Ancrage de vortex
vortex pinning
Critical current
Courant critique
Anisotropy
Mutli-band superconductors
Supraconductivité à multiples bandes
Magnétométrie à sondes à effet Hall
Hall probe magnetometry
Origine : Fichiers produits par l'(les) auteur(s)
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