Journal
PHYSICAL REVIEW LETTERS
Volume 100, Issue 22, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.100.227001
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We use quasiparticle tunneling across La(2-x)Ce(x)CuO(4) 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 B(c2)(T). For La(2-x)Ce(x)CuO(4) this approach sets a lower bound for B(c2)(0)approximate to 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.
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