Dresden 2006 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 7: Superconductivity & Solids At Low Temperature - Poster Session

TT 7.9: Poster

Montag, 27. März 2006, 14:00–17:45, P1

Effect of impurity additions on the superconducting properties of in situ-processed MgB₂ — •Marko Herrmann¹, Margitta Schubert¹, Wolfgang Häßler¹, Bernhard Holzapfel¹, and Ludwig Schultz^1,2 — ¹IFW Dresden, P.O. Box 270116, D-01171 Dresden, Germany — ²Dresden University of Technology, Department of Physics, Institute for Physics of Solids, D-01062 Dresden, Germany

The MgB₂ powder was prepared by mechanical alloying of Mg, amorphous Boron and the additive. For studying the influence of the additive on the superconducting properties its amount was varied up to 20 m-%. Single elements as carbon as well as compounds like SiC were used as dopants. The result of the milling process was a partially reacted nanosized precursor powder with a high reactivity which was hot pressed to bulk samples. Starting from the undoped MgB₂ with a critical temperature of 36 K and best current densities of 10 kA/cm² at 7.5 K and 4 T, the changes of the superconducting properties with the kind and amount of additive are described in detail.