The effect of oxygenation on the superconducting properties of MgB2 thin films

Yates, K. A.; Lockman, Z.; Kursumovic, A.; Burnell, G.; Stelmashenko, N. A.; MacManus Driscoll, J. L.; Blamire, M. G.
January 2005
Applied Physics Letters;1/10/2005, Vol. 86 Issue 2, p022502
Academic Journal
The effects of oxygen on the superconducting properties of thin films of MgB2 have been studied. It is found that after annealing for short times in flowing O2 at 400 °C, complex oxides of Mgx(ByO)z are formed that cause a “two-step” behavior in the resistively determined superconducting transition. These oxides are not stable at room temperature and decay into MgO and B2O3 precipitates. As the complex oxides decay so the original Tc behavior of the films is restored to its preoxygenation level.


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