Superconducting coupling across a spin-filtering manganite tunnel barrier with magnetic disorder

T. Harada; M. Matvejeff; R. Takahashi; M. Lippmaa

doi:10.1209/0295-5075/115/67005

Superconducting coupling across a spin-filtering manganite tunnel barrier with magnetic disorder

T. Harada, M. Matvejeff, R. Takahashi, M. Lippmaa

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

Abstract

Ferromagnetic insulator Josephson junctions consisting of Nb/Au/Pr_0.8Ca_0.2MnO₃/La_1.85Sr_0.15CuO₄ layers were fabricated. Non-linear current-voltage characteristics suggest the presence of superconducting coupling between the Nb/Au and La_1.85Sr_0.15CuO₄ layers across a ferromagnetic Pr_0.8Ca_0.2MnO₃ tunnel barrier. Tunneling spectra showed clear conductance peaks due to quasi-particle tunneling. Superconducting gap energies determined from the tunneling spectra were consistent with the temperature dependence of the critical current of the junctions. We argue that magnetic inhomogeneity in the ultrathin tunnel barrier plays a role in linking the superconducting states in Nb/Au and La_1.85Sr_0.15CuO₄.

Original language	English
Article number	67005
Journal	EPL
Volume	115
Issue number	6
DOIs	https://doi.org/10.1209/0295-5075/115/67005
Publication status	Published - 2016 Sep
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)

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title = "Superconducting coupling across a spin-filtering manganite tunnel barrier with magnetic disorder",

abstract = "Ferromagnetic insulator Josephson junctions consisting of Nb/Au/Pr0.8Ca0.2MnO3/La1.85Sr0.15CuO4 layers were fabricated. Non-linear current-voltage characteristics suggest the presence of superconducting coupling between the Nb/Au and La1.85Sr0.15CuO4 layers across a ferromagnetic Pr0.8Ca0.2MnO3 tunnel barrier. Tunneling spectra showed clear conductance peaks due to quasi-particle tunneling. Superconducting gap energies determined from the tunneling spectra were consistent with the temperature dependence of the critical current of the junctions. We argue that magnetic inhomogeneity in the ultrathin tunnel barrier plays a role in linking the superconducting states in Nb/Au and La1.85Sr0.15CuO4.",

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AU - Harada, T.

AU - Matvejeff, M.

AU - Takahashi, R.

AU - Lippmaa, M.

PY - 2016/9

Y1 - 2016/9

N2 - Ferromagnetic insulator Josephson junctions consisting of Nb/Au/Pr0.8Ca0.2MnO3/La1.85Sr0.15CuO4 layers were fabricated. Non-linear current-voltage characteristics suggest the presence of superconducting coupling between the Nb/Au and La1.85Sr0.15CuO4 layers across a ferromagnetic Pr0.8Ca0.2MnO3 tunnel barrier. Tunneling spectra showed clear conductance peaks due to quasi-particle tunneling. Superconducting gap energies determined from the tunneling spectra were consistent with the temperature dependence of the critical current of the junctions. We argue that magnetic inhomogeneity in the ultrathin tunnel barrier plays a role in linking the superconducting states in Nb/Au and La1.85Sr0.15CuO4.

AB - Ferromagnetic insulator Josephson junctions consisting of Nb/Au/Pr0.8Ca0.2MnO3/La1.85Sr0.15CuO4 layers were fabricated. Non-linear current-voltage characteristics suggest the presence of superconducting coupling between the Nb/Au and La1.85Sr0.15CuO4 layers across a ferromagnetic Pr0.8Ca0.2MnO3 tunnel barrier. Tunneling spectra showed clear conductance peaks due to quasi-particle tunneling. Superconducting gap energies determined from the tunneling spectra were consistent with the temperature dependence of the critical current of the junctions. We argue that magnetic inhomogeneity in the ultrathin tunnel barrier plays a role in linking the superconducting states in Nb/Au and La1.85Sr0.15CuO4.

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Superconducting coupling across a spin-filtering manganite tunnel barrier with magnetic disorder

Abstract

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