Spin-polarized tunneling of La0.67Sr0.33MnO3/YBa2Cu3O7-d junctions

Details Spin-polarized tunneling of La0.67Sr0.33MnO3/YBa2Cu3O7-d junctions Spin-polarized tunneling of La0.67Sr0.33MnO3/YBa2Cu3O7-d junctions

1999-08-30

arxiv.org/abs/cond-mat/9908431v1

Physics

Condensed Matter

Superconductivity

10 Pages, 7 EPS figures, Submitted to Phys. Rev. B

Scientific paper

10.1016/S0921-4534(00)00367-1

The transport properties between ferromagnets and high-Tc superconductors are investigated in La0.67Sr0.33MnO3/YBa2Cu3O7-d (LSMO/YBCO)junctions in the geometry of cross-strip lines. The conductance spectra show zero-bias conductance peaks (ZBCP), reflecting the charge transport in the ab-plane. When an external magnetic field is applied to the junctions, the conductance spectra show two notable features, i.e., an increase of background conductance and an asymmetric ZBCP splitting whose amplitude responds nonlinearly to the applied field. It is shown that the magnetic field response are consistent with a theoretical prediction of tunneling spectroscopy when the presence of a ferromagnetic barrier between a spin-polarized ferromagnet and a d-wave superconductor is assumed.

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