Andreev bound states in normal and ferromagnet/high-Tc superconducting tunnel junctions

Mario Freamat, K. W. Ng

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


Ag/BSCCO and Fe/Ag/BSCCO planar tunnel junctions were constructed in order to study experimentally the effect of an exchange potential on the spin polarized current transported through Andreev bound states appearing at the interface with a superconductor with broken time reversal pairing symmetry. The zero bias conductance peak (ZBCP) resulting from the Andreev bound states (ABS) is split into two symmetric peaks shifted at finite energies when the counterelectrode is normal. Four asymmetric peaks are observed when the ferromagnetic spin polarized charge reservoir is added, due to the combined effect of a spin filtering exchange energy in the barrier, which is a spin dependent phenomenon, and the spin independent effect of a broken time reversal symmetry (BTRS). The polarization in the iron layer leads to asymmetry. Due to the shift of ABS peaks to finite energies, the conductance at zero energy behaves as predicted by recent theoretical developments for pure d-wave junctions without Andreev reflections.

Original languageEnglish
Pages (from-to)1-6
Number of pages6
JournalPhysica C: Superconductivity and its Applications
Issue number1-2
StatePublished - Dec 15 2003


  • Andreev reflection
  • Spin polarized tunneling
  • d-wave superconductor

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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