2001/07/02 by C. Ferdeghini, V. Ferrando, G. Grassano +13 · 1 citation
Materials Science · Physics and Astronomy · #Iron-based superconductors research #Physics of Superconductivity and Magnetism #Superconductivity in MgB2 and Alloys #cond-mat.supr-con
paper · pdf · doi:10.1088/0953-2048/14/11/311
20 pages, 6 figures
arxiv created 2001/07/02 · openalex publication_date 2001/10/18 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/30
MgB 2 thin films were deposited using pulsed laser deposition (PLD) and ex situ annealing in Mg atmosphere. The films presented critical temperatures up to 36 K and turned out to be preferentially c -oriented both on Al 2 O 3 (r-cut) and MgO(100) substrates. Synchrotron analyses also gave some indications of in-plane texturing. The films exhibit very fine grain size (1200 Å in the basal plane and 100 Å along the c -axis) but the general resistivity behaviour and the remarkable extension of the irreversible region confirm that the grains' boundaries are not barriers for supercurrents. Upper critical field measurements with the magnetic field perpendicular and parallel with respect to the film surface evidenced a field anisotropy ratio of 1.8. The H c 2 values are considerably higher with respect to the bulk ones, namely when the field lies in the basal plane, and the field-temperature phase diagram for the two magnetic field orientations suggest the possibility of strongly enhancing the pinning region by means of texturing.