Spin-flip scattering and critical currents in ballistic half-metallic d-wave Josephson junctions

Abstract

We analyze the dc Josephson effect in a ballistic superconductor/half-metal/superconductor junction by means of the Bogoliubov de Gennes equations. We study the role of spin-active interfaces and compare how different superconductor symmetries, including d-wave pairing, affect the Josephson current. We analyze the critical current as a function of junction width, temperature, and spin-flip strength and direction. In particular, we demonstrate that the temperature dependence of the supercurrent in the dxy symmetry case differs qualitatively from the s and dx2-y2 symmetries. Moreover, we have derived a general analytical expression for the Andreev bound-state energies that shows how one can either induce 0-π transitions or continuously change the ground-state phase of the junction by controlling the magnetic misalignment at the interfaces.

arXiv comment7 pages, 7 figures

References in corpus (21)

• Coupling of two superconductors through a ferromagnet : evidence for a pi-junction
• A spin triplet supercurrent through the half-metallic ferromagnet CrO2
• Long-range effects in superconductor-ferromagnet structures
• Observation of spin-triplet superconductivity in Co-based Josephson Junctions
• Triplet supercurrents in clean and disordered half-metallic ferromagnets
• Theory of Half Metal-Superconductor Heterostructures
• Fully developed triplet proximity effect
• Superconducting phase coherent electron transport in proximity conical ferromagnets
• Josephson Effect due to Odd-frequency Pairs in Diffusive Half Metals
• Odd-frequency Pairs and Josephson Current through a Strong Ferromagnet
• DC Josephson Effect in SNS Junctions of Anisotropic Superconductors
• Spin-active interfaces and unconventional pairing in half-metal$\mid$superconductor junctions
• Unconventional proximity effect and inverse spin-switch behavior in a model manganite-cuprate-manganite trilayer system
• Josephson current and Andreev states in superconductor-half metal-superconductor heterostructures
• Andreev reflection at half-metal-superconductor interfaces with non-uniform magnetization
• Spin Josephson effect with a single superconductor
• Proximity effect and its enhancement by ferromagnetism in high-temperature superconductor-ferromagnet structures
• Conductance spectra of ferromagnetic superconductors: Quantum transport in a ferromagnetic metal/non-unitary ferromagnetic superconductor junction
• Tunneling conductance of ferromagnet/noncentrosymmetric superconductor junctions
• Proximity effect in ferromagnet-superconductor hybrid structures: role of the pairing symmetry
• Triplet supercurrent due to spin-active zones in a Josephson junction

Cited by in corpus (15)

• Spin-polarized supercurrents for spintronics: a review of current progress
• Triplet proximity effect in superconducting heterostructures with a half-metallic layer
• Quantized Josephson phase battery
• Topological superconductivity and Majorana fermions in hybrid structures involving cuprate high-T_c superconductors
• ${\phi }_0$-Josephson junction in twisted bilayer graphene induced by a valley-polarized state
• Spin Transport in Half-Metallic Ferromagnet-Superconductor Junctions
• Yu-Shiba-Rusinov bound states induced by a spin flipper in the vicinity of a s-wave superconductor
• Identifying Bogoliubov Fermi surfaces via thermoelectric response in a $d$-wave superconductor heterostructure
• Tuning the 0$-\pi$ Josephson junction with a magnetic impurity: Role of tunnel contacts, exchange coupling, $e-e$ interactions and high-spin states
• Collective magnetic and plasma excitations in Josephson $\psi$ junctions
• Josephson quantum spin thermodynamics
• Surface induced odd-frequency spin-triplet superconductivity as a veritable signature of Majorana bound states
• Spin flip scattering engendered quantum spin torque in a Josephson junction
• Yu-Shiba-Rusinov bound states boost odd-frequency superconductivity
• Characterizing a high spin magnetic impurity via Andreev reflection spectroscopy