  We study electronic transport in junctions consisting of a superconductor
electrode and two ferromagnet (F) leads in which crossed Andreev reflections
(CAR) and elastic cotunnelings are accommodated. We model the system using an
extended Blonder-Tinkham-Klapwijk treatment with a key modification that
accounts for spin-dependent interfacial barriers (SDIB). We compute
current-voltage relations as a function of parameters characterizing the SDIB,
magnetization in the F leads, geometry of the junction, and temperature. Our
results reveal a rich range of significantly altered physics due to a
combination of interfering spin-dependent scattering processes and population
imbalance in the ferromagnets, such as a significant enhancement in CAR current
and a sign change in the relative difference between resistance of two cases
having a antiparallel or parallel alignment of the magnetization in the F
leads, respectively. Our model accounts for the surprising experimental
findings of positive relative resistance by M. Colci et al. [Phys. Rev. B 85,
180512(R) (2012)] as well as previously measured negative relative resistance
results, both within sufficiently large parameter regions.
