Proximity and Josephson effects in microstructures based on multiband superconductors

Abstract

Emerging in the 1950s, the multiband superconductivity has been considered for a long time as an approximate model in the form of a generalization of the BCS theory to the case of two bands for a more accurate quantitative description of the properties and characteristics of such superconductors as cuprates, heavy fermions compounds, metal boron carbides, fullerides, strontium ruthenate etc. due to their complex piecewise-continuous Fermi surfaces. However the discovery of the multiband structure of the superconducting state in magnesium diboride in 2001 and iron oxypnictides and chalcogenides in 2008 led to the appearance of many papers in which effects and different dependences well known for conventional single-band s-wave superconductors were reexamined. The main purpose of these studies was to reveal the symmetry type of the order parameter, which provides an important information about the mechanism of Cooper pairing in these superconductors. One of the most effective methods of obtaining information on the symmetry properties of the order parameter in the multiband superconductors is phase-sensitive techniques. This review summarizes the results of theoretical and experimental studies of the proximity and Josephson effects in systems based on multiband superconductors in contact with normal metals, insulators and other superconductors.

25 pages, 31 figures

References in corpus (100)

• Random-Matrix Theory of Quantum Transport
• Unconventional sign-reversing superconductivity in LaFeAsO_(1-x)F_x
• Superconductivity in Iron Compounds
• Enhancement of the upper critical field by nonmagnetic impurities in dirty two-gap superconductors
• Magnetism, superconductivity, and pairing symmetry in Fe-based superconductors
• Evidence for two superconducting energy gaps in MgB2 by point-contact spectroscopy
• Quasiclassical Green's function approach to mesoscopic superconductivity
• Two Gap State Density in MgB${}_2$: A True Bulk Property or A Proximity Effect?
• Specific heat in the superconducting and normal state (2-300 K, 0-16 Teslas), and magnetic susceptibility of the 38-K superconductor MgB2: evidence for a multicomponent gap
• Two-Band Superconductivity in MgB2
• Multiband model for tunneling in MgB2 junctions
• Direct evidence for two-band superconductivity in MgB_2 single crystals from directional point-contact spectroscopy in magnetic fields
• Evidence for Two Superconducting Gaps in $Mg{B}_2$
• Ginzburg-Landau theory of vortices in a multi-gap superconductor
• Iron based superconductors: magnetism, superconductivity and electronic structure
• Three-band superconductivity and the order parameter that breaks time-reversal symmetry
• Scanning Tunneling Spectroscopy in MgB2
• Strong-coupling theory of superconductivity in a degenerate Hubbard model
• Limits of the upper critical field in dirty two-gap superconductors
• Specific heat of single crystal MgB_2: a two-band superconductor with two different anisotropies
• Pairing State with a time-reversal symmetry breaking in FeAs based superconductors
• Periodic alternating $0,\pi$-junction structures as realization of $\varphi$-Josephson junctions
• Exponential Temperature Dependence of Penetration Depth in Single Crystal MgB_2
• Evidence for Two-Band Superconductivity from Break Junction Tunneling on MgB2
• Integer and half-integer flux-quantum transitions in a niobium/iron-pnictide loop
• Definitive experimental evidence for two-band superconductivity in MgB2
• High-Resolution Photoemission Study of MgB2
• Microscopic derivation of two-component Ginzburg-Landau model and conditions of its applicability in two-band systems
• Broken time-reversal symmetry in Josephson junction involving two-band superconductors
• Observation of the Josephson effect in Pb/(Ba,K)Fe2As2 single crystal junctions
• Massless Leggett Mode in Three-band Superconductors with Time-Reversal-Symmetry Breaking
• Superconductive properties of thin dirty SN bilayers
• Evidence for Single-gap Superconductivity in Mg(B_{1-x}C_x)_2 Single Crystals with x=0.132 from Point-Contact Spectroscopy
• Possible high $T_c$ superconductivity mediated by antiferromagnetic spin fluctuations in systems with Fermi surface pockets
• Anisotropic resistivity and Hall effect in MgB2 single crystals
• Three-band s+- Eliashberg theory and the superconducting gaps of iron pnictides
• Novel Josephson effects between multi-gap and single-gap superconductors
• Vortices and chirality in multi-band superconductors
• All-MgB2 Josephson tunnel junctions
• Systematic study of the two band/two gap superconductivity in carbon-substituted MgB2 by point-contact spectroscopy
• Anomalous microwave conductivity coherence peak in c-axis MgB2 thin film
• Model of collective modes in three-band superconductors with repulsive interband interactions
• MgB2 tunnel junctions and 19 K low-noise dc superconducting quantum interference devices
• Can one extract the electron-phonon-interaction from tunneling data in case of the multigap superconductor MgB${}_2$?
• Josephson effect between a two-band superconductor with the s++ or s+- pairing symmetry and a conventional s-wave superconductor
• Frustrated multiband superconductivity
• Point-contact spectroscopy of Al- and C-doped MgB2. Superconducting energy gaps and scattering studies
• Ground state, collective mode, phase soliton and vortex in multiband superconductors
• Observation of the second harmonic in superconducting current-phase relation of Nb/Au/(001)YBa2Cu3Ox heterojunctions
• Quantum waveguide theory of Andreev reflection in multiband superconductors: the case of Fe-pnictides
• The proximity effect in normal metal - multiband superconductor hybrid structures
• In-plane Hall effect in c-axis-oriented MgB2 thin films
• The effect of magnetic impurities in a two-band superconductor: A point-contact study of Mn-substituted MgB2 single crystals
• Ambegaokar-Baratoff relations of Josephson critical current in heterojunctions with multi-gap superconductors
• Specific heat of Ca${}_{0.32}$Na${}_{0.68}$Fe${}_2$As${}_2$ single crystals: unconventional s${}_{\pm }$ multi-band superconductivity with intermediate repulsive interband coupling and sizable attractive intraband couplings
• Advances in point-contact spectroscopy: two-band superconductor MgB2 (A review)
• Baryonic Bound State of Vortices in Multicomponent Superconductors
• The Josephson current in Fe-based superconducting junctions: theory and experiment
• Complex state induced by impurities in multiband superconductors
• Coherent current states in a two-band superconductor
• Frustration phenomena in Josephson point contacts between single-band and three-band superconductors
• Josephson Effects in Three-Band Superconductors with Broken Time-Reversal Symmetry
• Phonon structure in I-V characteristic of MgB${}_2$ point-contacts
• Anomalous proximity effects at the interface of s and s+- superconductors
• Dc SQUID based on a three-band superconductor with broken time-reversal symmetry
• Metastable $\pi$-junction between an s${}_{\pm }$-wave and an s-wave superconductor
• Shapiro Steps as a Direct Probe of $\pm s$-wave Symmetry in Multi-gap Superconducting Josephson Junctions
• Universal scaling of the Hall resistivity in MgB2 superconductors
• Point-contact Andreev-reflection spectroscopy in segregation-free Mg_{1-x}Al_{x}B_2 single crystals up to x=0.32
• Doubling of the critical temperature of FeSe observed in point contacts
• Bicrystalline Grain Boundary and Hybrid SNS Junctions Based on Ba-122 Thin Films
• Temperature Dependence of Superconducting Gaps in Mg(Al)B2 System Investigated by SnS-Andreev Spectroscopy
• Theory of vortex structure in Josephson junctions with multiple tunneling channels: Vortex enlargement as a probe of $\pm s$-wave superconductivity
• Josephson currents in point contacts between dirty two-band superconductors
• All Magnesium diboride Josephson Junctions with MgO and native oxide barriers
• Ginzburg-Landau analysis of the critical temperature and the upper critical field for three-band superconductors
• Planar hybrid superconductor-normal metal-superconductor thin film junctions based on BaFe1.8Co0.2As2
• Phase diagram of Josephson junction between s and s+- superconductors in dirty limit
• Proximity fingerprint of s+- superconductivity
• Josephson systems based on ballistic point contacts between single-band and multi-band superconductors
• Josephson current and density of states in proximity circuits with s+- superconductors
• Josephson effect in point contacts between ''f-wave'' superconductors
• Quantum Waveguide Theory of the Josephson effect in Multiband Superconductors
• Point-Contact Spectroscopy in MgB_2: from Fundamental Physics to Thin-Film Characterization
• Josephson and spontaneous currents at the interface between two d-wave superconductors with transport current in the banks
• Realization of the $\pi$-state in junctions formed by multi-band superconductors with a spin-density-wave
• Exploring of point-contact spectra of Ba1-xNaxFe2As2 in the normal and superconducting state
• Excess current in point contacts on two-band superconductor MgB${}_2$ in magnetic field
• Probing the Order Parameter of Superconducting LiFeAs using Pb/LiFeAs and Au/LiFeAs Point-Contact Spectroscopy
• Superconductivity induced by inter-band nesting in the three-dimensional honeycomb lattice
• Time-reversal symmetry breaking state in dirty three-band superconductor
• The microscopic basis for phase-sensitive experiments for determination of the order parameter symmetry in Fe-based superconductors
• Fluxon Dynamics of a Long Josephson Junction with Two-gap Superconductors
• Minimal model of point contact Andreev reflection spectroscopy of multiband superconductors
• Analysis of nonlinear conductivity of point contacts on the base of FeSe in the normal and superconducting state
• Josephson effect and Andreev reflection in Ba(1-x)NaxFe2As2 (x=0.25 and 0.35) point contacts
• Single 20meV boson mode in KFe2As2 detected by point-contact spectroscopy
• Josephson effect in a weak link between borocarbides
• Directional point-contact spectroscopy of MgB2 single crystals in magnetic fields: two-band superconductivity and critical fields
• Effects of order parameter self-consistency in a $s_{\pm }$-s junction

Cited by in corpus (11)

• Supercurrent rectification with time-reversal symmetry broken multiband superconductors
• Coexistence of giant Cooper pairs with a bosonic condensate and anomalous behavior of energy gaps in the BCS-BEC crossover of a two-band superfluid Fermi gas
• Multiple-q current states in a multicomponent superconducting channel
• Josephson effect in two-band superconductors
• Phase solitons in a weakly coupled three-component superconductor
• Mechanism of screening or enhancing the pseudogap throughout the two-band Bardeen-Cooper-Schrieffer to Bose-Einstein condensate crossover
• Field-free Josephson diode effect in interacting chiral quantum dot junctions
• Frustration driven Josephson phase dynamics
• Anomalous Josephson diode effect in superconducting multilayers
• Collective excitations in two-band superconductors
• Geometric phase driven Josephson junction: Possible experimental scheme for the search of spin superfluidity