Magnetic field dependence of the proximity-induced triplet superconductivity at ferromagnet/superconductor interfaces

Yoav Kalcheim; Israel Felner; Oded Millo; Tal Kirzhner; Gad Koren; Angelo Di Bernardo; Mehmet Egilmez; Mark G. Blamire; J. W.A. Robinson

doi:10.1103/PhysRevB.89.180506

Magnetic field dependence of the proximity-induced triplet superconductivity at ferromagnet/superconductor interfaces

Yoav Kalcheim, Israel Felner, Oded Millo, Tal Kirzhner, Gad Koren, Angelo Di Bernardo, Mehmet Egilmez, Mark G. Blamire, J. W.A. Robinson

Racah Institute of Physics

Research output: Contribution to journal › Article › peer-review

38 Scopus citations

Abstract

Long-ranged superconductor proximity effects recently found in superconductor-ferromagnetic (S-F) systems are generally attributed to the formation of triplet-pairing correlations due to various forms of magnetic inhomogeneities at the S-F interface. In order to investigate this conjecture within a single F layer coupled to a superconductor, we performed scanning tunneling spectroscopy on bilayers of La2/3Ca1/3MnO3 (LCMO) ferromagnetic thin films grown on high-temperature superconducting films of YBa2Cu3O7-δ or Pr1.85Ce0.15CuO4 under various magnetic fields. We find a strong correlation between the magnitude of superconductor-related spectral features measured on the LCMO layer and the degree of magnetic inhomogeneity controlled by the external magnetic field. This corroborates theoretical predictions regarding the role played by magnetic inhomogeneities in inducing triplet pairing at S-F interfaces.

Original language	English
Article number	180506
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	89
Issue number	18
DOIs	https://doi.org/10.1103/PhysRevB.89.180506
State	Published - 21 May 2014

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Kalcheim, Y., Felner, I., Millo, O., Kirzhner, T., Koren, G., Di Bernardo, A., Egilmez, M., Blamire, M. G., & Robinson, J. W. A. (2014). Magnetic field dependence of the proximity-induced triplet superconductivity at ferromagnet/superconductor interfaces. Physical Review B - Condensed Matter and Materials Physics, 89(18), Article 180506. https://doi.org/10.1103/PhysRevB.89.180506

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abstract = "Long-ranged superconductor proximity effects recently found in superconductor-ferromagnetic (S-F) systems are generally attributed to the formation of triplet-pairing correlations due to various forms of magnetic inhomogeneities at the S-F interface. In order to investigate this conjecture within a single F layer coupled to a superconductor, we performed scanning tunneling spectroscopy on bilayers of La2/3Ca1/3MnO3 (LCMO) ferromagnetic thin films grown on high-temperature superconducting films of YBa2Cu3O7-δ or Pr1.85Ce0.15CuO4 under various magnetic fields. We find a strong correlation between the magnitude of superconductor-related spectral features measured on the LCMO layer and the degree of magnetic inhomogeneity controlled by the external magnetic field. This corroborates theoretical predictions regarding the role played by magnetic inhomogeneities in inducing triplet pairing at S-F interfaces.",

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AU - Felner, Israel

AU - Millo, Oded

AU - Kirzhner, Tal

AU - Koren, Gad

AU - Di Bernardo, Angelo

AU - Egilmez, Mehmet

AU - Blamire, Mark G.

AU - Robinson, J. W.A.

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AB - Long-ranged superconductor proximity effects recently found in superconductor-ferromagnetic (S-F) systems are generally attributed to the formation of triplet-pairing correlations due to various forms of magnetic inhomogeneities at the S-F interface. In order to investigate this conjecture within a single F layer coupled to a superconductor, we performed scanning tunneling spectroscopy on bilayers of La2/3Ca1/3MnO3 (LCMO) ferromagnetic thin films grown on high-temperature superconducting films of YBa2Cu3O7-δ or Pr1.85Ce0.15CuO4 under various magnetic fields. We find a strong correlation between the magnitude of superconductor-related spectral features measured on the LCMO layer and the degree of magnetic inhomogeneity controlled by the external magnetic field. This corroborates theoretical predictions regarding the role played by magnetic inhomogeneities in inducing triplet pairing at S-F interfaces.

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Magnetic field dependence of the proximity-induced triplet superconductivity at ferromagnet/superconductor interfaces

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