Berlin 2012 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 33: Superconductivity, Measuring Devices, Matter at Low Temperature: Poster Session

TT 33.33: Poster

Mittwoch, 28. März 2012, 15:00–19:00, Poster B

Asymmetric resistive switching in Bi₂Sr₂CaCu₂O_8+x single crystals — •Holger Motzkau, Thorsten Jacobs, Sven-Olof Katterwe, Andreas Rydh, and Vladimir M. Krasnov — Experimental Condensed Matter Physics, Department of Physics, Stockholm University, AlbaNova University Center, 106 91 Stockholm, Sweden

We study resistive switching phenomena in small mesa structures on top of Bi₂Sr₂CaCu₂O_8+x (Bi-2212) and Bi_1.75Pb_0.25Sr₂CaCu₂O_8+x (Bi(Pb)-2212) single crystals. We manipulate the normal state resistance of the mesa by a bias voltage as well as short current pulses, and study current-voltage characteristics, magnetoresistance, and the temperature dependence of the resistance. Indications of several different switching mechanisms are found, including asymmetric, current directional dependent changes of the resistance, and filamentary breakdown. We find that resistive changes from a fairly gentle biasing is accompanied by a clear influence on the superconducting properties, including critical current, critical temperature, and gap voltage. Our findings indicate that ion transport may occur at the conditions where resistive switching takes place, and therefore should not be neglected in the interpretation of resistive switching mechanisms of Bi-2212.