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Please use this identifier to cite or link to this item: https://dspace.lboro.ac.uk/2134/1751

Title: Observation of Andreev bound states in bicrystal grain-boundary Josephson junctions of the electron doped superconductor LaCeCuO
Authors: Chesca, Boris
Seifried, M.
Dahm, T.
Schopohl, N.
Koelle, D.
Kleiner, R.
Tsukada, A.
Issue Date: 2004
Abstract: We observe a zero-bias conductance peak (ZBCP) in the ab-plane quasiparticle tunneling spectra of thin film grain-boundary Josephson junctions made of the electron doped cuprate superconductor LaCeCuO. An applied magnetic field reduces the spectral weight around zero energy and shifts it non-linearly to higher energies consistent with a Doppler shift of the Andreev bound states (ABS) energy. For all magnetic fields the ZBCP appears simultaneously with the onset of superconductivity. These observations strongly suggest that the ZBCP results from the formation of ABS at the junction interfaces, and, consequently, that there is a sign change in the symmetry of the superconducting order parameter of this compound consistent with a d-wave symmetry.
Description: This is a pre-print. It is also available at: http://arxiv.org/abs/cond-mat/0402131.
URI: https://dspace.lboro.ac.uk/2134/1751
Appears in Collections:Pre-Prints (Physics)

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