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Highly smooth and c-axis oriented superconducting MgB2 thin films wereprepared by pulsed laser deposition (PLD) with off-axis geometry. The filmswere deposited on Al2O3-C substrates perpendicularly aligned to astoichiometric MgB2 target in a 120 mTorr high purity Ar background gas. An insitu annealing was carried out at 650C for 1 min in a 760 Torr Ar atmosphere.Despite the short annealing time, an x-ray theta-2 theta scan shows fairly goodcrystallization, according to the clear c-axis oriented peaks for the films.Both atomic force microscopy and the x-ray diffraction results indicate thatthe crystallite size is less than 50nm. The root mean square roughness of ouroff-axis film is ~4 nm in a 5x5 square micron area. The Tc onset value of thebest off-axis film reaches 33.1 K with a narrow transition width of 0.9 K. Thefilms showed no anisotropy in Hc2-T curves when parallel and perpendicularfields were applied. The slope of Hc2-T curves in low field regime is 1 T/K,which is among the highest reported values.Comment: 7 pages 7 figure

Off-axis MgB2films using anin situannealing pulsed laser deposition method

Off-axis MgB₂films using anin situannealing pulsed laser deposition method