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TT: Fachverband Tiefe Temperaturen

TT 6: Superconductivity: Tunnelling & Josephson Junctions

TT 6.3: Vortrag

Montag, 11. März 2013, 10:00–10:15, H18

Superconductivity induced by carrier injection into non-superconducting Bi₂Sr₂CaCu₂O₈ — •Yilmaz Simsek¹, Yuri Koval¹, Irina Lazareva¹, Christian Steiner¹, Xiaoyue Jin², and Paul Müller¹ — ¹Department of Physics, Universität Erlangen — ²Department of Electrical Engineering and Computer Science, MIT, Cambridge, Massachusetts, USA

The doping-induced phase transition from the antiferromagnetic to the superconducting state is still one of the fascinating subjects of high-Tc superconductors. Unlike doping by oxygen excess, we are able to change the carrier concentration of Bi₂Sr₂CaCu₂O_8+δ (Bi2212) single crystals by injecting large currents along the c-axis. The injected electrons are trapped in the BiO and SrO layers which is compensated by increasing the hole concentration in the CuO layers. The goal of our contribution is to induce superconductivity in non-superconducting Bi2212. To eliminate the contact resistance, we have fabricated double cross-bar crystal stacks of fully oxygen depleted Bi2212 single crystal which was not superconducting above 4.2 K. Therefore we were able to investigate the evolution of c-axis transport properties from the antiferromagnetic to the superconducting state exclusively by carrier injection. We have also investigated the doping mechanism by carrier injection depending on the number of intrinsic Josephson junction, ambient temperature and doping level of the sample.