Effect of damage by 2-MeV He ions on the normal and superconducting properties of magnesium diboride

Details Effect of damage by 2-MeV He ions on the normal and superconducting properties of magnesium diboride Effect of damage by 2-MeV He ions on the normal and superconducting properties of magnesium diboride

2004-10-26

arxiv.org/abs/cond-mat/0410655v2

Physics

Condensed Matter

Superconductivity

14 pages and 3 figures; Submitted to Applied Physics Letters

Scientific paper

10.1063/1.1845591

We have studied the effect of damage induced by 2-MeV alpha particles on the critical temperature, Tc, and resistivity of MgB2 thin films. This technique allows defects to be controllably introduced into MgB2 in small successive steps. Tc decreases linearly as the intragrain resistivity at 40 K increases, while the intergrain connectivity is not changed. Tc is ultimately reduced to less than 7 K and we see no evidence for a saturation of Tc at about 20 K, contrary to the predictions of the Tc of MgB2 in the dirty limit of interband scattering.

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