Upper bound on the Andreev states induced second harmonic in the Josephson coupling of YBa2Cu3O7− ÕNb junctions from experiment and numerical simulations
نویسندگان
چکیده
B. Chesca,1,2,* H. J. H. Smilde,3 and H. Hilgenkamp3 1Department of Physics, Loughborough University, Loughborough LE11 3TU, United Kingdom 2Physikalisches Institut-Experimentalphysik II, Universität Tübingen, Auf der Morgenstelle 14, D-72076 Tübingen, Germany 3Faculty of Science and Technology and Mesa Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands Received 29 January 2008; published 16 May 2008
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We have made in-situ [103] and [110]YBCO/Pb junctions, which display an hysteretic behaviour with both a well-defined Quasi-Particule branch and a Josephson current. A zero energy conductance peak is observed in the tunneling conductance which is a signature of Andreev Bound States (ABS) at a surface of a d-wave superconductor. The observed splitting of this peak at low temperature may confirm ...
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