Multi transitions in MgB2 films prepared by pulsed laser deposition

TL;DR

This study reports the growth of MgB2 superconducting films via pulsed laser deposition and postannealing, revealing multiple superconducting transitions and analyzing their properties under magnetic fields.

Contribution

It demonstrates the occurrence of multiple superconducting transitions in MgB2 films prepared by pulsed laser deposition and investigates their origins and properties.

Findings

Multiple superconducting transitions observed in MgB2 films.

The phenomena are not caused by magnesium deficiency.

Transport properties under magnetic fields were characterized.

Abstract

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.