Andreev bound states at a cuprate grain boundary junction: A lower bound for the upper critical field

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dc.creatorWagenknecht, M.
dc.creatorKoelle, D.
dc.creatorKleiner, R.
dc.creatorGraser, S.
dc.creatorSchopohl, N.
dc.creatorChesca, B.
dc.creatorTsukada, A.
dc.creatorGoennenwein, S. T. B.
dc.creatorGross, R.
dc.date2007-09-18
dc.date.accessioned2026-07-07T09:46:29Z
dc.date.available2026-07-07T09:46:29Z
dc.descriptionWe investigate in-plane quasiparticle tunneling across thin film grain boundary junctions (GBJs) of the electron-doped cuprate La$_{2-x}$Ce$_{x}$CuO$_4$ in magnetic fields up to $B=16 $T, perpendicular to the CuO$_2$ layers. The differential conductance in the superconducting state shows a zero bias conductance peak (ZBCP) due to zero energy surface Andreev bound states. With increasing temperature $T$, the ZBCP vanishes at the critical temperature $T_c\approx29 $K if B=0, and at $T=12 $K for B=16 T. As the ZBCP is related to the macroscopic phase coherence of the superconducting state, we argue that the disappearance of the ZBCP at a field $B_{ZBCP}(T)$ must occur below the upper critical field $B_{c2}(T)$ of the superconductor. We find $B_{ZBCP}(0) \approx 25 $T which is at least a factor of 2.5 higher than previous estimates of $B_{c2}(0)$.
dc.description4 pages, 4 figures
dc.identifierhttps://arxiv.org/abs/0709.2853
dc.identifierhttp://arxiv.org/abs/0709.2853
dc.identifierPhys. Rev. Lett. 100, 227001 (2008)
dc.identifierdoi:10.1103/PhysRevLett.100.227001
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/163548
dc.subjectSuperconductivity
dc.titleAndreev bound states at a cuprate grain boundary junction: A lower bound for the upper critical field
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