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TT: Fachverband Tiefe Temperaturen

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

TT 50.5: Vortrag

Donnerstag, 17. März 2011, 15:00–15:15, HSZ 301

The tunnel barrier of intrinsic Josephson junctions in Bi₂Sr₂CaCu₂O_8+δ after doping by current injection — •X. Y. Jin, S. Probst, Y. Simsek, C. Steiner, Y. Koval, and P. Müller — Department of Physics and Interdisciplinary Center for Molecular Materials (ICMM), Universität Erlangen-Nürnberg, Germany

Superconductivity of Bi₂Sr₂CaCu₂O_8+δ single crystals can be tuned electronically in a wide range by current injection along the c-axis [1]. We investigate the change of superconducting properties after current injection by performing macroscopic quantum tunneling experiments of intrinsic Josephson junctions. An exponential increase of critical current density j_c with increase of hole concentration was observed. At the same time, microwave spectroscopy has shown that the junction capacitance per unit area increased by a factor of 5. Both experiments indicate that the tunnel barrier of intrinsic Josephson junction was significantly modified by the increase of the doping level.

[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).