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TT: Fachverband Tiefe Temperaturen
TT 15: SC: Fabrication and Characterization
TT 15.3: Talk
Monday, March 14, 2011, 17:00–17:15, HSZ 301
Electric and Magnetic Characterization of La-doped Bi2Sr2−xLaxCuO6 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 Bi2Sr2−xLaxCuO6 single crystals. The critical temperature, Tc, 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.