Evidence for anisotropic triplet superconductor order parameter in half metallic ferromagnetic La_0.7Ca_0.3MnO_3 proximity coupled to superconducting Pr_1.85Ce_0.15CuO_4
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Kalcheim, Y., Millo, O., Egilmez, M., Robinson, J., & Blamire, M. (2012). Evidence for anisotropic triplet superconductor order parameter in half metallic ferromagnetic La_0.7Ca_0.3MnO_3 proximity coupled to superconducting Pr_1.85Ce_0.15CuO_4. 85 1045041-1045045. https://doi.org/10.1103/PhysRevB.85.104504
Scanning tunneling spectroscopy measurements performed on La_0.7Ca_0.3MnO_3 (LCMO) films epitaxially grown on Pr_1.85Ce_0.15CuO_4 (PCCO) reveal localized penetration of superconductivity into the LCMO up to distances much larger than is possible for Cooper pairs in a singlet spin state to exist. This long-range proximity effect is manifested in the tunneling spectra as gaps and, less abundantly, as zero-bias conductance peaks (ZBCPs). Since ZBCPs were not found on the bare PCCO films, their appearance is attributed to an anisotropic (p-wave or d-wave) triplet-pairing superconductor order parameter induced in the LCMO.
External DOI: https://doi.org/10.1103/PhysRevB.85.104504
This record's URL: https://www.repository.cam.ac.uk/handle/1810/245864