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Regensburg 2000 – scientific programme

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TT: Tiefe Temperaturen

TT 11: Borkarbide

TT 11.8: Talk

Tuesday, March 28, 2000, 16:30–16:45, H19

Superconductivity of annealed and consoldated amorphous YNi2B2C powders — •Carl-Georg Oertel1, Lars Ledig1, J"urgen Eckert2, and Werner Skrotzki11Institut f"ur Kristallographie und Festk"orperphysik, Technische Universit"at Dresden, D-01062 Dresden — 2Institut f"ur metallische Werkstoffe, IFW Dresden, D- 01171 Dresden

Amorphous YNi2B2C powders have been produced by mechanical attrition. Superconductivity is absent in amourphous state but recovers upon crystallisation. However, the superconducting transition temperature TC is lower than that of the molten analogue. It can be increased by increasing the annealing temperature. High temperature forging lightly dense compact superconducting samples. TC of these bulk samples can be optimised by annealing. Variations in TC are attributed to deviations from stoichiometry.

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