Coupling of two superconductors through a ferromagnet : evidence for a pi-junction

Abstract

We report measurements of the temperature dependence of the critical current in Josephson junctions consisting of conventional superconducting banks of Nb and a weakly ferromagnetic interlayer of a Cu${}_x$Ni${}_{1-x}$ alloy, with $x$ around 0.5. With decreasing temperature $I_c$ generally increases, but for specific thicknesses of the ferromagnetic interlayer, a maximum is found followed by a strong decrease down to zero, after which $I_c$ rises again. Such a sharp cusp can only be explained by assuming that the junction changes from a 0-phase state at high temperatures to a $\pi$-phase state at low temperatures.

6 pages, 4 figures, submitted to PRL

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• Theory of fractional vortex escape in a 0-kappa long Josephson junction
• Proximity effect in a ferromagnetic semiconductor with spin-orbit interactions
• Josephson current through a quantum dot coupled to a molecular magnet
• Microwave-induced pi-junction transition in a superconductor / quantum-dot / superconductor structure
• Spectrum of Andreev bound states in Josepshon junctions with a ferromagnetic insulator
• Josephson current transport through a Quantum Dot in an Aharonov-Bohm Ring
• Spin-flip scattering and non-ideal interfaces in dirty ferromagnet/superconductor junctions
• Ferromagnetic Josephson junctions for cryogenic memory
• Sudden Critical Current Drops Induced in S/F Structures
• Back-action supercurrent diodes
• Control of Josephson current by Aharonov-Casher Phase in a Rashba Ring
• High-Density Superconductive Logic Circuits Utilizing 0 and $\pi$ Josephson Junctions
• What is the value of the superconducting gap of a F/S/F trilayer ?
• Influence of the FFLO-like State on the Upper Critical Field of a S/F Bilayer: Angular and Temperature Dependence
• Supercurrent Vortex Pinball via a Triplet Cooper Pair Inverse Edelstein Effect
• Resonant tunneling in short Josephson SFS junctions
• Enhanced superconducting proximity effect in clean ferromagnetic domain structures
• Energy gap of ferromagnet-superconductor bilayers
• Magnetic Flux Pumping in Superconducting Loop Containing a Josephson $\psi$ Junction
• First order phase transitions in Ferromagnet/Superconductor layered structures
• Stationary Josephson effect in a short multi-terminal junction
• Composite excitation of Josephson phase and spin waves in Josephson junctions with ferromagnetic insulator
• Magnonic $\phi$ Josephson junctions and synchronized precession
• Josephson effect between triplet superconductors through a ferromagnetic barrier of finite width
• Spontaneous Josephson $\pi$ Junctions with Topological Superconductors
• Anomalous current-voltage characteristics of SFIFS Josephson junctions with weak ferromagnetic interlayers
• Signatures of superconducting triplet pairing in Ni--Ga-bilayer junctions
• Andreev bound states in ferromagnet-superconductor nanostructures
• Theory of Josephson transport through spintronics nano-structure
• Anomalous Josephson diode effect in superconducting multilayers
• Density of states anomalies in hybrid superconductor-ferromagnet-normal metal structures
• Josephson current in a normal-metal nanowire coupled to superconductor/ferromagnet/superconductor junction
• Microscopic theory of equilibrium properties of F/S/F trilayers with weak ferromagnets
• Pt and CoB trilayer Josephson $\pi$ junctions with perpendicular magnetic anisotropy
• A new kind of vortex pinning in superconductor / ferromagnet nanocomposites
• Design of realistic switches for coupling superconducting solid-state qubits
• Phase biasing of a Josephson junction using Rashba-Edelstein effect
• Current-phase relation in Josephson junction coupled with a magnetic dot
• Tunability of Andreev levels via spin-orbit coupling in Zeeman-split Josephson junctions
• Controllable supercurrent in mesoscopic superconductor-normal metal-ferromagnet crosslike Josephson structures
• Oscillatory superconducting transition temperature in superconductor/antiferromagnet heterostructures
• Signature of long-ranged spin triplets across a two-dimensional superconductor/helimagnet van der Waals interface
• Reentrant superconductivity in proximity to a topological insulator
• Visualization of ferromagnetic domains in TbNi${}_2$B${}_2$C and ErNi${}_2$B${}_2$C single crystals: Weak ferromagnetism and its coexistence with superconductivity
• Depairing currents in superconductor / ferromagnet Nb/CuNi trilayers close to T${}_c$
• Spin-split conductance and subgap peak in ferromagnet/superconductor spin valve heterostructures
• Domain wall induced modulation of low field H-T phase diagram in patterned superconductor-ferromagnet stripes
• Cooper quartets in interacting hybrid superconducting systems
• Proximity effect and electron transport in the oxide hybrid heterostructures with superconducting/magnetic interfaces
• Bistable state in superconductor/ferromagnet heterostructures
• Cascading Proximity Effects in Rotating Magnetizations
• Lattice-mismatch-induced granularity in CoPt-NbN and NbN-CoPt superconductor-ferromagnet heterostructures: Effect of strain
• Semifluxons in Superconductivity and Cold Atomic Gases
• Interaction-modulated tunneling dynamics in a mixture of Bose-Einstein condensates
• Phase dynamics of tunnel Al-based ferromagnetic Josephson junctions
• Supercurrent-induced long-range triplet correlations and controllable Josephson effect in superconductor/ferromagnet hybrids with extrinsic SOC
• Origin of Spontaneous Currents in a Superconductor-Ferromagnet Proximity System
• Tuning the 0$-\pi$ Josephson junction with a magnetic impurity: Role of tunnel contacts, exchange coupling, $e-e$ interactions and high-spin states
• Magnetic interference patterns in long disordered Josephson junctions
• Gate-tunable nonlocal Josephson effect through magnetic van der Waals bilayers
• Theory of quantum transport in Josephson junctions with a ferromagnetic insulator
• Superconducting decay length in a ferromagnetic metal
• Time dilation of a bound half-fluxon pair in a long Josephson junction with a ferromagnetic insulator
• Supergap and subgap enhanced currents in asymmetric {S_1FS_2} Josephson junctions
• Energy distribution controlled ballistic Josephson junction
• Giant electromagnetic proximity effect in superconductor/ferromagnet superlattices
• Charge and Spin Supercurrents in Magnetic Josephson Junctions with Spin Filters and Domain Walls
• Magnetic eigenmodes in chains of coupled phi0-Josephson junctions with ferromagnetic weak links
• Gate-tunable superconducting quantum interference devices of PbS nanowires
• Local Density of States and Order Parameter Configurations in Layered Ferromagnet-Superconductor Structures
• 0-pi transition in SFS junctions with strongly spin-dependent scattering
• Mesoscopic Josephson junctions with switchable current-phase relation
• Fractionalization of a flux quantum in a one-dimensional parallel Josephson junction array with alternating $\pi$ junctions
• Sequence of phase transitions induced in an array of Josephson junctions by their crossover to pi-state
• Josephson Plasma in RuSr2GdCu2O8
• Collective magnetic and plasma excitations in Josephson $\psi$ junctions
• Ballistic SNS sandwich as a Josephson junction
• Phase-controlled spin and charge currents in superconductor-ferromagnet hybrids
• Long range statistical fluctuations of the crossed Josephson current
• Tunable ground states in helical $p$-wave Josephson junctions
• Spin-asymmetric Josephson plasma oscillations
• The physics of superconductor-ferromagnet hybrid structures
• Tunneling of trapped-atom Bose condensates
• Density of states and current-voltage characteristics in SIsFS junctions
• Quasiparticle conductance in Spin Valve Josephson Structures
• Towards precise measurement of oscillatory domain wall by ferromagnetic Josephson junction
• Andreev spin-noise detector
• Expanding the operational temperature window of a superconducting spin valve
• Fully frustrated Josephson junction ladders with Mobius boundary conditions as topologically protected qubits
• Exploration of Altermagnetism in $\mathrm{Ru}{\mathrm{O}}_2$
• Influence of Josephson current second harmonic on stability of magnetic flux in long junctions
• Effect of d-f hybridization on the Josephson current through Eu-chalcogenides
• Quantum tunneling of a single semifluxon in a 0-pi Josephson junction
• Existence and stability analysis of finite 0-$\pi$-0 Josephson junctions
• π junction transition in InAs self-assembled quantum dot coupled with SQUID
• Bending-strain effects in conventional superconductors and superconducting junctions
• Superfluid/ferromagnet/superfluid junction and $\pi$-phase in a superfluid Fermi gas
• Chemomagnetism, magnetoconcentration effect and "fishtail" anomaly in chemically-induced granular superconductors
• In-plane magnetic field vs. temperature phase diagram of a quasi-2D frustrated multiband superconductor
• Non-adiabatic Josephson Dynamics in Junctions with in-Gap Quasiparticles
• Designing arrays of Josephson junctions for specific static responses
• Localized mode interactions in 0-pi Josephson junctions
• Sudden Magnetization Drops in S/F bilayered Structures
• $\pi$-junction and spontaneous current state in a superfluid Fermi gas
• Classification of magnetic inhomogeneities and $0-\pi$ transitions in superconducting-magnetic hybrid structures
• Neel proximity effect in superconductor/antiferromagnet heterostructures
• Yu-Shiba-Rusinov bands in superconductors in contact with a magnetic insulator
• Superconductor-Ferromagnet Bi-Layers: a Comparison of s-Wave and d-Wave Order Parameters
• Numerical investigation of the second harmonic effects in the LJJ
• Magnetic field induced polarization effects in intrinsically granular superconductors
• Interference phenomena in Josephson junctions with ferromagnetic bilayers: Spin-triplet correlations and resonances
• Interface driven reentrant superconductivity in HoNi${}_5$-NbN-HoNi${}_5$ nanostructures
• Zero-Field Fiske Resonance Coupled with Spin-waves in Ferromagnetic Josephson Junctions
• Superconducting spin valve effect in Fe/Si${}_3$N${}_4$/Pb/Si${}_3$N${}_4$/Fe heterostructures
• Dynamic properties of asymmetric double Josephson junction stack with quasiparticle imbalance
• Josephson effect in multi-terminal superconductor-ferromagnet junctions coupled via triplet components
• Chirality and spin transformation of triplet Cooper pairs upon interaction with singlet condensate
• Controllable Josephson diode effect, $0$-$\pi$ transition and switch effect in the superconductor/two-dimensional Weyl nodal line semimetal/superconductor junctions
• Josephson effect in superconductor-normal dot-superconductor junctions driven out of equilibrium by quasiparticle injection
• Effect of 2${}^{\text{nd}}$ harmonic current--phase relation on a behavior of a Josephson Traveling Wave Parametric Amplifier
• Effect of interfaces on supercurrent through ferromagnetic materials
• The role of canting and depleted-triplet minima in superconducting spin valve structures
• Voltage-driven dynamics of ${\phi }_0$-S/F/S Josephson junctions chains
• Thermally induced 0-pi phase transition in Josephson junctions through a ferromagnetic oxide film
• Phase tunable Josephson junction and spontaneous mass current in a spin-orbit coupled Fermi superfluid
• Vortex Fractionalization in a Josephson Ladder
• Magnetic-field-induced supercurrent enhancement in hybrid superconductor/magnetic metal structures
• Enhancement of the Josephson current by magnetic field in superconducting tunnel structures with paramagnetic spacer
• High-field vortices in Josephson junctions with alternating critical current density
• Width of the $0-\pi$ phase transition in diffusive magnetic Josephson junctions
• Topologically protected qubits as minimal Josephson junction arrays with non trivial boundary conditions: a proposal
• Robust coupling of superconducting order parameter in a mesoscale NbN-Fe-NbN epitaxial structure
• Subgap modes in two-dimensional magnetic Josephson junctions
• Nonhomogeneous magnetization and superconductivity in superconductor-ferromagnet structures
• Maximum supercurrent in Josephson junctions with alternating critical current density
• Signatures of Long-Range Spin-Triplet Component in Andreev Interferometer
• Theoretical study of magnetism induced by proximity effect in a ferromagnetic Josephson junction with a normal metal
• Josephson $\pi$-state in superconductor-Luttinger liquid hybrid systems
• Negative critical currents in single-channel Josephson junctions
• Novel $\pi$-type vortex in a nanoscale extreme type-II superconductor: Induced by quantum-size effect
• Sign reversal of ac Josephson current in a ferromagnetic Josephson junction
• Numerical study of magnetic flux in the LJJ model with double sine-Gordon equation
• Magnetic field-controlled 0-$\pi$ transitions and their experimental signatures in superconductor-ferromagnet-superconductor junctions
• Numerical study of pi-junction using spin filtering barriers
• Evidence of the inverse proximity effect in tunnel magnetic Josephson Junctions
• Anomalous Andreev interferometer: Study of an anomalous Josephson junction coupled to a normal wire
• 0-$\pi$ transition driven by magnetic proximity effect in a Josephson junction
• Flux-Trapping Fluxonium Qubit
• Fulde-Ferrell-Larkin-Ovchinnikov state in a superconducting thin film attached to a ferromagnetic cluster
• Proximity Induced Non-collinear Magnetic States in Planar Superconductor/Ferromagnet Hybrids
• Perturbative Analysis of the Field-Free Josephson Diode Effect in a Multilayered Josephson Junction
• Mobile $\pi -$kinks and half-integer zero-field-like steps in highly discrete alternating $0-\pi$ Josephson junction arrays
• Domain wall motion in a diffusive weak ferromagnet
• Josephson current and $\pi -$state in ferromagnet with embedded superconducting nanoparticles
• Interplay between Superconductivity and Altermagnetism in Disordered Materials and Heterostructures
• Polarization Controlled Supercurrent in Ferroelectric Josephson Junction
• Detection of non separable correlations with dc transport: a new type of Aharonov-Bohm effect
• Comparison of NiFeCr and NiFe in ferromagnetic Josephson junctions
• DC Josephson effect between two Yu-Shiba-Rusinov bound states
• Spin-transfer torque switching in nanopillar superconducting-magnetic hybrid Josephson junctions
• Tunable critical supercurrent and spin-asymmetric Josephson effect in superlattices
• Anomalous phase shift and superconducting diode effect in Josephson junctions via thin films of rare-earth intermetallic magnets
• Observation of 0 to pi transition in YBCO/Gallium oxide multilayers
• Self-consistent solution for the magnetic exchange interaction mediated by a superconductor
• Large critical current density Josephson $\pi$ junctions with PdNi barriers
• The influence of the spin-dependent phases of tunneling electrons on the conductance of a point ferromagnet/isolator/d-wave superconductor contact
• Hybrid collective excitations in topological superconductor/ferromagnetic insulator heterostructures
• Tunneling Hamiltonian description of the atomic-scale 0-pi transition in superconductor/ferromagnetic-insulator junctions
• Planar Hall supercurrent and δϕ-shift in the topological Josephson junction
• Supercurrent transmission through Ni/Ru/Ni synthetic antiferromagnets
• Minigap suppression in S(N/F)S junctions
• Noise induced transition in Josephson junction with second harmonic
• Quantum phase transition in a double quantum dot Josephson junction driven by electron-electron interactions
• Giant oscillatory Gilbert damping in superconductor/ferromagnet/superconductor junctions
• Perspectives on Magnetic/Superconductor Hybrid Systems: Long-range Electromagnetic Phenomena Induced by Proximity Effect and Interfacial Spin-orbit Coupling
• Spin Josephson diode effect induced by higher-harmonic spin Josephson currents in a diffusive Josephson junction
• Enhancement of supercurrent through ferromagnetic materials by interface engineering
• Structures and proximity effects of inhomogeneous population-imbalanced Fermi gases with pairing interactions
• Josephson anomalous vortices
• All fractional Shapiro steps in the RSJ model with two Josephson harmonics