Dresden 2011 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 10: Poster Session: Superconductivity
TT 10.6: Poster
Monday, March 14, 2011, 14:00–18:00, P4
NdBa2Cu3Ox nanowires grown in anodized alumina templates by microwave heating — •Michael R Koblischka, Anjela Koblischka-Veneva, and Uwe Hartmann — Institute of Experimental Physics, Saarland University, P.O.Box 151150, D-66041 Saarbrücken, Germany
Nanowires of NdBa2Cu3Ox (NdBCO) are grown employing commercial anodized alumina templates (pore diameters of 10 nm and 100 nm, overall thickness of 50 µm) and pre-prepared NdBCO powders. The heating was performed employing a kitchen-type microwave furnace at a power of 550 W for 5 min. This treatment is sufficient to melt the NdBCO powder on top of the alumina template. In contrast to previous experiments using a laboratory furnace at a temperature of 1050 ∘C, the temperature here is not surpassing 450 ∘C. As a result, the templates remain fully flat and the structure of the nanopores is not affected by the heat treatment. An additional oxygen annealing step is required to obtain superconducting nanowires. Superconductivity with a transition temperature of 88 K is confirmed by means of magnetic susceptibility measurements (SQUID, AC susceptibility). The resulting nanowires are analyzed in detail employing electron microscopy (SEM, TEM).