2005/02/02 by Yue Zhao, Mihail Ionescu, Josip Horvat +1 · 1 citation
Physics and Astronomy · #Physics of Superconductivity and Magnetism #Superconductivity in MgB2 and Alloys #Surface and Thin Film Phenomena #cond-mat.supr-con
paper · pdf · doi:10.1088/0953-2048/18/4/004
published as Supercond. Sci. Technol. 18 (2005) 395 · 7 pages 7 figures
openalex publication_date 2005/02/02 · arxiv created 2005/03/31 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/30
Highly smooth and c -axis oriented superconducting MgB 2 thin films were prepared by pulsed laser deposition (PLD) with off-axis geometry. The films were deposited on Al 2 O 3 –C substrates perpendicularly aligned to a stoichiometric MgB 2 target in a 120 mTorr high purity Ar background gas. An in situ annealing was carried out at 650 °C for 1 min in a 760 Torr Ar atmosphere. Despite the short annealing time, an x-ray θ–2θ scan shows fairly good crystallization, according to the clear c -axis oriented peaks for the films. Both atomic force microscopy and the x-ray diffraction results indicate that the crystallite size is less than 50 nm. The root mean square roughness of our off-axis film is nm in a 5 × 5 µm 2 area. The T c onset value of the best off-axis film reaches 33.1 K with a narrow transition width of 0.9 K. The films showed no anisotropy in H c 2 –T curves when parallel and perpendicular fields were applied. The slope of the H c 2 –T curves in the low field regime is 1 T K −1 , which is among the highest reported values.