Home » Node » Anisotropy of the coherence length from critical currents in the stoichiometric superconductor LiFeAs

Anisotropy of the coherence length from critical currents in the stoichiometric superconductor LiFeAs

TitleAnisotropy of the coherence length from critical currents in the stoichiometric superconductor LiFeAs
Publication TypeJournal Article
Year of Publication2011
AuthorsKonczykowski M, van der Beek CJ, Tanatar MA, Mosser V, Song YJ, Kwon YS, Prozorov R
Journal TitlePhysical Review B
Volume84
Pages180514
Date Published11/29
ISBN Number1098-0121
Accession NumberISI:000297474000001
KeywordsCRYSTALS, magnetic-field
Abstract

Miniature Hall-probe arrays were used to measure the critical current densities for the three main directions 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 epsilon(xi). This allows for the extraction of epsilon(xi) at magnetic fields far below the upper critical field B(c2). We find that increasing the magnetic field decreases the anisotropy of the coherence length.
URL<Go to ISI>://000297474000001
DOI10.1103/Physrevb.84.180514
Alternate JournalPhys Rev B