Dresden 2011 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 15: SC: Fabrication and Characterization

TT 15.3: Vortrag

Montag, 14. März 2011, 17:00–17:15, HSZ 301

Electric and Magnetic Characterization of La-doped Bi₂Sr_2−xLa_xCuO₆ single crystals — •Michael R Koblischka¹, Johannes Lillig¹, Michal Rames², Milos Jirsa², Huiqian Luo³, Hai-Hu Wen³, and Uwe Hartmann¹ — ¹Institute of Experimental Physics, Saarland University, P.O.Box 151150, D-66041 Saarbrücken, Germany — ²Institute of Physics, ASCR, Na Slovance 2, CZ-182 21 Prague, Czech Republic — ³National Laboratory for Superconductivity, P.O.Box 603, Beijing, 100190, P.R.China

We present an exhaustive electric and magnetic characterization of La-doped Bi₂Sr_2−xLa_xCuO₆ single crystals. The critical temperature, T_c, is varying from 27 K to 0 depending on the La content with a maximum at x= 0.4. For the measurements we selected samples with x= 0.4 (optimally doped) and x= 0.6 (slightly underdoped). The sample x= 0.6 shows an onset of superconductivity at 25 K and a transition width of 3.5 K. However, at temperatures lower than 20 K, a clear upturn of the resistance curve is found, which also depends on the applied field and the flowing current. The origin of this behavior is discussed.