Anisotropic field dependence of the electronic transport in superconducting FeSe thin films. (4th June 2020)

• Record Type: Journal Article
• Authors: Schneider, R; Zaitsev, A G; Fuchs, D; Hott, R
• Is Part Of: Superconductor science & technology. Volume 33:Number 7(2020:Jul.)
• Publication Date: 2020-06-04
• Subjects: iron based superconductors -- upper critical field -- critical current density -- anisotropy; Superconductivity -- Periodicals; Superconductors -- Periodicals; 537.623
• DOI: 10.1088/1361-6668/ab9001
• Languages: English
• ISSNs: 0953-2048

Abstract

Abstract: Electronic transport measurements were carried out on c -axis oriented epitaxial FeSe thin films in static magnetic fields up to 14 T parallel to the crystallographic c -axis and parallel to the ab -plane. The temperature dependence of the upper critical fields B c 2 c and B c 2 a b was determined from the field dependence of the resistivity. While B c 2 c was orbitally limited, the larger B c 2 a b was paramagnetically limited. The anisotropy γ B was decreasing with decreasing temperature and revealed a pseudoisotropic behaviour towards zero temperature. This temperature dependence is indicative of the multiband character of FeSe. From measurements of the temperature- and field-dependent critical current densities the effective depinning or irreversibility field B c 2 ∗ was obtained, and its angular dependence yielded the effective mass anisotropy γ m . The temperature dependence of γ m, which was different from that of γ B, can be considered as another signature of multiband FeSe.