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Title: Phase diagram of the electron-doped La(2-x)Ce(x)CuO(4) cuprate superconductor from Andreev bound states at grain boundary junctions
Authors: Wagenknecht, M.
Koelle, D.
Kleiner, R.
Graser, S.
Schopohl, N.
Chesca, Boris
Tsukada, A.
Goennenwein, S.T.B.
Gross, R.
Issue Date: 2008
Publisher: © American Physical Society
Citation: WAGENKNECHT, M. ... et al, 2008. Phase diagram of the electron-doped La(2-x)Ce(x)CuO(4) cuprate superconductor from Andreev bound states at grain boundary junctions. Physical Review Letters, 100 (22), 4pp.
Abstract: We use quasiparticle tunneling across La2 xCexCuO4 grain boundary junctions to probe the superconducting state and its disappearance with increasing temperature and magnetic field. A zero bias conductance peak due to zero energy surface Andreev bound states is a clear signature of the phase coherence of the superconducting state. Hence, such a peak must disappear at or below the upper critical field Bc2 T . For La2 xCexCuO4 this approach sets a lower bound for Bc2 0 25 T which is substantially higher than reported previously. The method of probing the superconducting state via Andreev bound states should also be applicable to other cuprate superconductors.
Version: Published
DOI: 10.1103/PhysRevLett.100.227001
URI: https://dspace.lboro.ac.uk/2134/12890
Publisher Link: http://dx.doi.org/10.1103/PhysRevLett.100.227001
ISSN: 0031-9007
Appears in Collections:Published Articles (Physics)

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