M. Eisterer, R. Müller, K. Schöppl, H. W. Weber, S. Soltanian, S.X. Dou:
"Universal influence of disorder on MgB2";
Superconductor Science and Technology,
The influence of disorder on the superconducting properties of MgB2 wires
was investigated. Disorder was introduced in three different ways: by the
addition of SiC, by neutron irradiation or by a low processing temperature.
We find a nearly identical influence of these three methods on the normal
state resistivity, on the upper critical field and on the critical currents in all
three cases. The residual resistivity turns out to be a useful parameter for
disorder, if normalized appropriately. We extract the mean free path of the
charge carriers in the σ band from the Gor´kov-Goodman relation. The wires
investigated in this study fall in the range from the moderately clean to the
dirty limit. The most important change in view of possible applications is the
increase of the upper critical field, leading to higher critical currents in high
Erstellt aus der Publikationsdatenbank der Technischen Universität Wien.