Spin-polarized tunneling of La0.67Sr0.33MnO3/YBa2Cu3O7-d junctions
A. Sawa, S. Kashiwaya, H. Obara, H. Yamasaki, and M., Koyanagi(Electrotechnical Laboratory) N. Yoshida, Y. Tanaka (Nagoya, University)
TL;DR
This study investigates spin-polarized tunneling in LSMO/YBCO junctions, revealing magnetic field effects on conductance spectra consistent with theoretical models of ferromagnetic barriers between spin-polarized ferromagnets and d-wave superconductors.
Contribution
It provides experimental evidence of magnetic field influence on tunneling spectra in ferromagnet-superconductor junctions, supporting theoretical predictions.
Findings
Increase in background conductance under magnetic field
Asymmetric splitting of zero-bias conductance peaks
Nonlinear response of peak amplitude to magnetic field
Abstract
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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