Dresden 2009 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 32: Postersession Superconductivity: Josephson Junctions, SQUIDs, Heterostructures, Andreev Scattering, Vortex Physics, Cryodetectors, Measuring Devices, Cryotechnique
TT 32.10: Poster
Mittwoch, 25. März 2009, 14:00–18:00, P1A
Transport measurements on melt-textured SEG-123 superconductors exhibiting nanostripes — •Michael R. Koblischka1, Marc Winter1, Anming Hu2, and Uwe Hartmann1 — 1Experimental Physics, Saarland University, Campus C 6 3, D-66123 Saarbrücken, Germany — 2Department of Physics, University of Waterloo, 200 Univ. Ave. West, Waterloo, ON, N2L 3P7, Canada
Transport measurements were performed on melt-textured, ternary light rare earth (LRE)-compounds (Sm0.33Eu0.33Gd0.33)Ba2Cu3Ox (SEG) exhibiting self-organized nanostripes. The periodicity of these nanostripes ranges between 40 and 60 nm and extends over several tens of micrometers up to millimeters, as revealed by atomic force microscopy at ambient conditions [1]. Electrical contacts were prepared on the polished sample surface by means of electron-beam lithography, enabling the measurement of transport currents oriented parallel and perpendicular to the nanostripe direction. On decreasing the temperature from Tc, the data of the parallel direction deviate in intermediate fields (around 1 T) from the data of the perpendicular direction. At 85 K, there is a clear difference in jc between the two directions, with jcparallel > jcperp. Plotting the data in a scaling fashion shows that the peak positions are clearly different with h0parallel > h0perp, which indicates an increase of the δ Tc pinning.
[1] M.R.Koblischka et al., Jpn. J. Appl. Phys. 45, 2259 (2006).