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TT: Fachverband Tiefe Temperaturen

TT 50: SC: Tunneling, Josephson Junctions, SQUIDs 2

TT 50.3: Talk

Thursday, March 17, 2011, 14:30–14:45, HSZ 301

Systematic investigation of the current injection effect in Bi₂Sr₂CaCu₂O_8+δ — •S. Probst, X. Y. Jin, Y. Simsek, C. Steiner, and P. Müller — Department of Physics and Interdisciplinary Center for Molecular Materials (ICMM), Universität Erlangen-Nürnberg, Germany

By current injection we can change the properties of Bi₂Sr₂CaCu₂O_8+δ single crystals electronically in a wide range [1]. In order to investigate the doping process in greater detail, we have performed automated current injection experiments in very small bias current/voltage steps. By measuring the IV characteristics as well as doping current and doping voltage simultaneously, the change of superconducting properties is monitored. We were able to determine precisely the threshold-bias region where doping starts. We will discuss the observed phenomena and give an estimate for the depth of trap levels, which is crucial to understand the doping process.

[1] Y. Koval, X. Y. Jin, C. Bergmann, Y. Simsek, L. Ozyuzer, P. Müller, H. B. Wang, G. Behr, B. Büchner, Appl. Phys. Lett. 96, 082507 (2010).