Transport in multi-terminal superconductor/ferromagnet junctions having spin-dependent interfaces
arXiv:1209.4478 · doi:10.1103/PhysRevB.87.054509
Abstract
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.
12 pages, 10 figures
References in corpus (38)
- Random-Matrix Theory of Quantum Transport
- Proximity effects in superconductor-ferromagnet heterostructures
- Odd Triplet Superconductivity and Related Phenomena in Superconductor-Ferromagnet Structures
- Coupling of two superconductors through a ferromagnet : evidence for a pi-junction
- A spin triplet supercurrent through the half-metallic ferromagnet CrO2
- Andreev Reflection In Ferromagnet-Superconductor Junctions
- Andreev-Tunneling, Coulomb Blockade, and Resonant Transport of Non-Local Spin-Entangled Electrons
- Triplet supercurrents in clean and disordered half-metallic ferromagnets
- Evidence for crossed Andreev reflection in superconductor-ferromagnet hybrid structures
- Odd triplet superconductivity in superconductor/ferromagnet multilayered structures
- Experimental observation of bias-dependent non-local Andreev reflection
- Correlated tunneling into a superconductor in a multiprobe hybrid structure
- Probing Spatial Correlations with Nanoscale Two-Contact Tunneling
- Phase coherent transport in hybrid superconducting nanostructures
- Spin-Imbalance and Magnetoresistance in Ferromagnet/Superconductor/Ferromagnet Double Tunnel Junctions
- Tunneling spectroscopy for ferromagnet/superconductor junctions
- Superconducting proximity effect in a mesoscopic ferromagnetic wire
- Evidence for Macroscopic Quantum Tunneling of Phase Slips in Long One-Dimensional Superconducting Al Wires
- Josephson currents through spin-active interfaces
- Suppression of superconductivity in nanowires by bulk superconductors
- Pairing symmetry conversion by spin-active interfaces in superconducting junctions
- The scattering problem in non-equilibrium quasiclassical theory of metals and superconductors: general boundary conditions and applications
- Interplay of spin-discriminated Andreev bound states forming the 0- transition in Superconductor-Ferromagnet-Superconductor Junctions
- Striking properties of Superconductor/Ferromagnet structures with spin-dependent scattering
- Circuit theory of crossed Andreev reflection
- Spin-dependent Transparency of Ferromagnet/Superconductor Interfaces
- Crossed Andreev Reflection in Structures Consisting of a Superconductor with Ferromagnetic Leads
- Superconducting proximity effect in a diffusive ferromagnet with spin-active interfaces
- Transfer-matrix description of heterostructures involving superconductors and ferromagnets
- Spin-active interfaces and unconventional pairing in half-metalsuperconductor junctions
- Andreev reflection at half-metal-superconductor interfaces with non-uniform magnetization
- Crossed Andreev reflection at ferromagnetic domain walls
- Positive cross-correlations induced by ferromagnetic contacts
- Crossed Andreev reflection-induced magnetoresistance
- Transport theory of multiterminal hybrid structures
- Anomalous polarization-dependent transport in nanoscale double-barrier superconductor/ferromagnet/superconductor junctions
- Nonlocal conductance via overlapping Andreev bound states in ferromagnet-superconductor heterostructures
- Spin-Valve Effect of the Spin Accumulation Resistance in a Double Ferromagnet - Superconductor Junction
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- Non-collinear Andreev reflections in semiconductor nanowires
- Magnetism induced by nonlocal spin-entangled electrons in a superconducting spin-valve
- Long-range superharmonic Josephson current and spin-triplet pairing correlations in a junction with ferromagnetic bilayers