Multi transitions in MgB2 films prepared by pulsed laser deposition

Details Multi transitions in MgB2 films prepared by pulsed laser deposition Multi transitions in MgB2 films prepared by pulsed laser deposition

2004-12-31

arxiv.org/abs/cond-mat/0412776v1

Physics

Condensed Matter

Superconductivity

17 pages, 2 tables, 7 figures

Scientific paper

We have grown MgB2 films in a postannealing process. Precursors were prepared on Al2O3(0001) substrates by codeposition of Mg and MgB2 using pulsed laser deposition technique. Superconducting MgB2 thin films were obtained via an ex situ postannealing process, with various annealing temperatures and durations. In magnetic measurement we found more than one transitions in almost all the samples, and the temperature dependence of the resistance confirmed this phenomena. We proved this is not result of magnesium deficiency. Transportation properties of MgB2 thin films under strong magnetic fields are also studied.

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