Physics – Condensed Matter – Superconductivity
Scientific paper
2009-09-24
Phys. Rev. B 81, 024516 (2010)
Physics
Condensed Matter
Superconductivity
Revised version with editorial title change, added clarifications and references. 7 pages 6 figs
Scientific paper
10.1103/PhysRevB.81.024516
Using scanning tunneling spectroscopy we have investigated the spatial evolution of the anomalous c-axis zero bias conductance peak, discovered in a previous study by our group, in epitaxial La$_{1.88}$Sr$_{0.12}$CuO$_4$ thin films. We found an anisotropic spatial dependence of the corresponding low-energy density of states which complies with the predicted spectral features of an anti-phase ordering of the d-wave order parameter within the ab-plane. Such an ordering was recently suggested to account for the 1/8 anomaly in the high temperature superconductors and the dynamical layer decoupling recently reported to occur in the transport studies of La$_{15/8}$Ba$_{1/8}$CuO$_4$.
Asulin Itay
Koren Gad
Millo Oded
Yuli Ofer
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