Berlin 2005 – scientific programme
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TT: Tiefe Temperaturen
TT 4: Symposium Superconducting Cuprates
TT 4.1: Invited Talk
Friday, March 4, 2005, 14:00–14:30, TU H104
Phase Sensitive Tests with Cuprate Superconductors Based on the Josephson Effect and Andreev bound states — •Boris Chesca1, Dietmar Dönitz1, Dieter Kölle1, Reinhold Kleiner1, A. Tsukada2, Michio Naito2, Ariando3, and Hans Hilgenkamp 3 — 1Physikalisches Institut-Experimentalphysik II, Universität Tübingen, Germany — 2NTT Basic Research Lab., Japan — 3Faculty of Science and Technology and MESA+ Research Inst., University of Twente, The Netherlands
Junctions formed between two superconductors provide the unique opportunity to obtain information on the symmetry of the superconducting order parameter simultaneously from tunneling of Cooper pairs and of quasiparticles. Indeed, on one hand the d-wave symmetry leads to striking anomalies in the Cooper pair Josephson tunneling in both hole- and electron-doped cuprate junctions: spontaneous appearance of half flux quanta [1] or GHz circulating currents [2], or field enhanced Josephson currents [2-4]. On the other hand, Andreev bound states induced zero-bias conductance peak (ZBCP) in the tunneling spectra of quasiparticles is also a clear signature of d-wave symmetry. We discuss the controversy of ZBCP physics in electron-doped cuprate junctions [5] as well as the importance of the complementary character of these two different phase sensitive tests. We consider two cases: junctions formed between cuprates or between cuprate and conventional superconductors.
[1] C.C. Tsuei and J.R. Kirtley, Rev. Mod. Phys. 72, 969 (2001);
[2] B. Chesca et al., Phys. Rev. Lett. 88, 177003 (2002);
[3] B. Chesca et al., Phys. Rev. Lett. 90, 057004 (2003);
[4] R. R. Schulz, et al., Appl. Phys. Lett. 76, 912 (2000);
[5] B. Chesca et al., Condmat-0402131 (2003).