Theoretical Study of Point-Contact Andreev Reflection Spectroscopy for Ferromagnetic Metal/Insulator/D-Wave Superconductor Junctions

This paper theoretically analyzed Andreev reflection in the ferromagnetic metal/insulator/d-wave superconductor junctions using the Bogoliubov-de Gennes equations. We calculated the total tunneling conductance spectra and found that the conductance suppression due to the insulator depends on the relation between the exchange energy and the Fermi wave number difference. Our results showed the feasibility of the spin polarization measurement with high-T_c superconductivity using the same system of the Point-contact Andreev reflection (PCAR) measurement.