Point Contact Spectra on YBa${}_2$Cu${}_3$O${}_{7-x}$/La${}_{0.7}$Ca${}_{0.3}$MnO${}_3$ bilayers

Abstract

We present conductance characteristics of point contact junctions realized between a normal Pt-Ir tip and YBa${}_2$Cu${}_3$O${}_{7-x}$/La${}_{0.7}$Ca${}_{0.3}$MnO${}_3$ (YBCO/LCMO) bilayers. The point contact characteristics show a zero bias conductance peak, as a consequence of the formation of Andreev bound states at the YBCO Fermi level. The temperature evolution of the spectra reveals a depressed zero bias peak and a reduced superconducting energy gap, both explainable in terms of spin polarization effects due to the LCMO layer.

arXiv comment4 pages, 4 EPS figures. Proceedings of EUCAS 2005. Accepted in Journal of Physics: Conference Series

References in corpus (6)

• Andreev - Saint James reflections: a probe of cuprate superconductors
• Spin current in ferromagnet/insulator/superconductor junctions
• Temperature-dependence of spin-polarized transport in ferromagnet / unconventional superconductor junctions
• Point Contact Spin Spectroscopy of Ferromagnetic MnAs Epitaxial Films
• Spin-polarized tunneling of La0.67Sr0.33MnO3/YBa2Cu3O7-d junctions
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Cited by in corpus (2)

• Asymmetric tunneling, Andreev reflection and dynamic conductance spectra in strongly correlated metals
• Non-monotonic behaviour of the superconducting order parameter in Nb/PdNi bilayers observed through point contact spectroscopy