Dresden 2011 – scientific programme

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TT: Fachverband Tiefe Temperaturen

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

TT 50.4: Talk

Thursday, March 17, 2011, 14:45–15:00, HSZ 301

Superconductivity induced by current injection into non-superconducting Bi₂Sr₂CaCu₂O₈ — •Y. Simsek, Y. Koval, X. Y. Jin, S. Probst, and P. Müller — Department of Physics and Interdisciplinary Center for Molecular Materials (ICMM), Universität Erlangen-Nürnberg, Germany

We already have shown that we can change the carrier concentration of Bi₂Sr₂CaCu₂O_8+δ single crystals by current injection along the c-axis [1]. In this work, we focus on the interesting question: Can we induce superconductivity in non-superconducting Bi₂Sr₂CaCu₂O₈ merely by current injection? We report on current-injection experiments of fully oxygen depleted Bi₂Sr₂CaCu₂O₈ in which superconductivity was not observed down to 4.2 K. In order to eliminate the contact resistance of the highly resistive depleted material, we have fabricated double cross-bar crystal stacks. We have increased the c-axis conductivity by carrier injection until superconductivity above 4.2 K was observed. Doping the sample further by current injection, optimum-doped and even overdoped states were obtained. The current injection effect was persistent up to annealing temperatures of approximately 270 K.

[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.