Physics – Condensed Matter – Superconductivity
Scientific paper
2007-09-18
Phys. Rev. Lett. 100, 227001 (2008)
Physics
Condensed Matter
Superconductivity
4 pages, 4 figures
Scientific paper
10.1103/PhysRevLett.100.227001
We 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 $B_{c2}(0)$.
Chesca B.
Goennenwein Sebastian T. B.
Graser Siegfried
Gross Ralf
Kleiner Reinhold
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