TY - JOUR
T1 - Transport in multiterminal superconductor/ferromagnet junctions having spin-dependent interfaces
AU - Sun, Kuei
AU - Shah, Nayana
AU - Vishveshwara, Smitha
PY - 2013/2/22
Y1 - 2013/2/22
N2 - 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 as well as previously measured negative relative resistance results, both within sufficiently large parameter regions.
AB - 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 as well as previously measured negative relative resistance results, both within sufficiently large parameter regions.
UR - http://www.scopus.com/inward/record.url?scp=84874539810&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84874539810&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.87.054509
DO - 10.1103/PhysRevB.87.054509
M3 - Article
AN - SCOPUS:84874539810
SN - 1098-0121
VL - 87
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 5
M1 - 054509
ER -