Abstract
The role of a layered structure in superconducting pinning properties is still at a debate. The effects of the vortex shape, which can assume for example a staircase form, could influence the interplay with extrinsic pinning coming from the specific defects of the material, thus inducing an effective magnetic field dependence. To enlighten this role, we analysed the angular dependence of flux pinning energy U(H,θ) as a function of magnetic field in FeSe0.5Te0.5 thin film by considering the field components along the ab-plane of the crystal structure and the c-axis direction. U(H,θ) has been evaluated from magneto-resistivity measurements acquired at different orientations between the applied field up to 16 T and FeSe0.5Te0.5 thin films grown on a CaF2 substrate. We observed that the U(H,θ) shows an anisotropic trend as a function of both the intensity and the direction of the applied field. Such a behaviour can be correlated to the presence of extended defects elongated in the ab-planes, thus mimicking a layered superconductor, as we observed in the microstructure of the compound. The comparison of FeSe0.5Te0.5 with other superconducting materials provides a more general understanding on the flux pinning energy in layered superconductors.
Highlights
Accepted: 8 September 2021For high-power applications of superconductors, vortex pinning is a fundamental aspect to be taken into consideration since it regulates the critical current density Jc
Fe(Se,Te) [14], the investigation of the flux pinning energy behaviour under the influence of a magnetic field applied at different angles for Ironbased superconductors (IBS) becomes of great interest, since the control of dissipation remains a fundamental requirement for implementing IBS in high-power applications
The STEM micrograph was acquired by using a probe convergence semi-angle of 33 mrad with the Annular Dark-Field (ADF) detector collecting signals at a high inner semi-angle (80 mrad)
Summary
For high-power applications of superconductors, vortex pinning is a fundamental aspect to be taken into consideration since it regulates the critical current density Jc. Vortex pinning is intimately connected to the structure of the defects into the material and the characteristics of the vortex matter in a real superconductor [1,2]. The flux pinning energy dependence on the applied magnetic field has been critically studied in the past for these HTS materials [9,10]. The tilt of the magnetic field can influence the interaction among vortices in superconductors that are not too anisotropic. Fe(Se,Te) [14], the investigation of the flux pinning energy behaviour under the influence of a magnetic field applied at different angles for IBS becomes of great interest, since the control of dissipation remains a fundamental requirement for implementing IBS in high-power applications
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