Zero-bias anomalies on Sr0.88La0.12CuO2 thin films

Abstract

High-impedance contacts made on the surface of Sr0.88La0.12CuO2 superconducting thin films systematically display a zero-bias anomaly. We consider two-level systems (TLS) as the origin of this anomaly. We observe that the contribution of some TLS to the contact resistance is weakened by a magnetic field. We show that this could result from the increase of the TLS relaxation rate in the superconducting state, due to its ability to create pairs of quasiparticles out of the condensate, when located close to the surface of the film.

Carrier confinement effects observed in the normal-state electrical transport of electron-doped cuprate trilayers

“…Values of this parameter are generally quite difficult to experimentally define. Typical values given in the literature, are around 5 nm [43] which are of the same order as magnitude of the SLCO central layer thickness investigated in this work. Finally, we remark that STEM, XRD and XRR analysis all confirm the absence of structural disorder at the interfaces and that the T C versus y behavior is better described in terms of electronically clean interfaces.…”