Andreev bound states at a cuprate grain boundary junction: A lower bound for the upper critical field
arXiv:0709.2853 · doi:10.1103/PhysRevLett.100.227001
Abstract
We investigate in-plane quasiparticle tunneling across thin film grain boundary junctions (GBJs) of the electron-doped cuprate LaCeCuO in magnetic fields up to T, perpendicular to the CuO 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 , the ZBCP vanishes at the critical temperature K if B=0, and at 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 must occur below the upper critical field of the superconductor. We find T which is at least a factor of 2.5 higher than previous estimates of .
arXiv comment4 pages, 4 figures
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- Anomalous Andreev bound state in non-centrosymmetric superconductors
- Josephson Effect in Noncentrosymmetric Superconductor Junctions
- Surface instability in nodal noncentrosymmetric superconductors
- Modification of Born impurity scattering near the surface of d-wave superconductors and influence of external magnetic field
- Raman light scattering study and microstructural analysis of epitaxial films of the electron-doped superconductor La_{2-x}Ce_{x}CuO_{4}
- Importance of grain boundary Josephson junctions in the electron-doped infinite-layer cuprate superconductor SrLaCuO