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

Samanta Piano; Fabrizio Bobba; Adele De Santis; Filippo Giubileo; Alessandro Scarfato; Anna Maria Cucolo

doi:10.1088/1742-6596/43/1/273

paper

Point Contact Spectra on YBa $_{2}$ Cu $_{3}$ O $_{7 - x}$ /La $_{0.7}$ Ca $_{0.3}$ MnO $_{3}$ bilayers

arXiv:cond-mat/0601680 · doi:10.1088/1742-6596/43/1/273

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.

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

Point Contact Spectra on YBa2​Cu3​O7−x​/La0.7​Ca0.3​MnO3​ bilayers

Abstract

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Point Contact Spectra on YBa $_{2}$ Cu $_{3}$ O $_{7 - x}$ /La $_{0.7}$ Ca $_{0.3}$ MnO $_{3}$ bilayers