Spontaneous currents in a superconductor with s+is symmetry

Abstract

We analyze $s+is$ state proposed as a candidate superconducting state for strongly hole-doped Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$. Such a state breaks time-reversal symmetry (TRS) but does not break any other discrete symmetry. We address the issue whether TRS breaking alone can generate spontaneous currents near impurity sites, which could be detected in, e.g., muSR experiments. We argue that there are no spontaneous currents if only TRS is broken. However, supercurrents do emerge if the system is put under external strain and C4 lattice rotation symmetry is externally broken.

arXiv comment4 figs, 4+5 pages

References in corpus (38)

• Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
• Non-abelian statistics of half-quantum vortices in p-wave superconductors
• The Puzzle of High Temperature Superconductivity in Layered Iron Pnictides and Chalcogenides
• High-temperature superconductivity in iron-based materials
• Nematic order in iron superconductors - who is in the driver's seat?
• Gap symmetry and structure of Fe-based superconductors
• Near-degeneracy of several pairing channels in multiorbital models for the Fe-pnictides
• Topological Superconductivity and Superfluidity
• Chiral superconductivity from repulsive interactions in doped graphene
• FeAs-based superconductivity: a case study of the effects of transition metal doping on BaFe2As2
• The spin quantum Hall effect in unconventional superconductors
• Non-Abelian Topological Orders and Majorana Fermions in Spin-Singlet Superconductors
• Competing many-body instabilities and unconventional superconductivity in graphene
• Magnetic Induction of d + i d Order in High-Tc Superconductors
• On edge states in superconductor with time inversion symmetry breaking
• Universal heat conduction in the iron-arsenide superconductor KFe2As2 : Evidence of a d-wave state
• Pairing State with a time-reversal symmetry breaking in FeAs based superconductors
• Chiral $d$-wave Superconductivity in SrPtAs
• Quantum phase transitions in d-wave superconductors
• s+is State with Broken Time Reversal Symmetry in Fe-Based Superconductors
• Kohn-Luttinger superconductivity in graphene
• Spontaneous Hall effect in chiral p-wave superconductor
• Polar Kerr Effect as Probe for Time-Reversal Symmetry Breaking in Unconventional Superconductors
• Evolution of superconductivity in Fe-based systems with doping
• Change of pairing symmetry in the iron-based superconductor KFe2As2
• Evolution of symmetry and structure of the gap in Fe-based superconductors with doping and interactions
• Anisotropic chiral d+id superconductivity in NaxCoO2 yH2O
• Domain walls and their experimental signatures in s+is superconductors
• Leggett modes in iron-based superconductors as a probe of Time Reversal Symmetry Breaking
• Pairing in the iron arsenides: a functional RG treatment
• Stable topological phases in a family of two-dimensional fermion models
• Superconducting phase with a chiral $f$-wave pairing symmetry and Majorana fermions induced in a hole-doped semiconductor
• Magnetic and Kohn-Luttinger instabilities near a Van Hove singularity: monolayer versus twisted bilayer graphene
• Superconducting gap with sign reversal between hole pockets in heavily hole-doped Ba1-xKxFe2As2
• Sudden reversal in the pressure dependence of Tc in the iron-based superconductor CsFe2As2: A possible link between inelastic scattering and pairing symmetry
• Superconductors with broken time-reversal symmetry: Spontaneous magnetization and quantum Hall effects
• Fermi surface of Ba{1-x}KxFe2As2 as probed by angle-resolved photoemission
• Unusual mechanism of vortex viscosity generated by mixed normal modes in superconductors with broken time reversal symmetry

Cited by in corpus (32)

• Second-order Topological Superconductors with Mixed Pairing
• Emerging superconductivity with broken time reversal symmetry inside a superconducting $s$-wave state
• Superconductivity vs bound state formation in a two-band superconductor with small Fermi energy -- applications to Fe-pnictides/chalcogenides and doped SrTiO3
• Energy Gap Evolution Across the Superconductivity Dome in Single Crystals of (Ba${}_{1-x}$K${}_x$)Fe${}_2$As${}_2$
• Superconductivity with broken time reversal symmetry in ion irradiated Ba${}_{0.27}$K${}_{0.73}$Fe${}_2$As${}_2$ single crystals
• Distinguishing between $s+id$ and $s+is$ pairing symmetries in multiband superconductors through spontaneous magnetization pattern induced by a defect
• s+is superconductivity with incipient bands: doping dependence and STM signatures
• Using electron irradiation to probe iron - based superconductors
• Thermoelectric Signatures of Time-Reversal Symmetry Breaking States in Multiband Superconductors
• Microscopically derived multi-component Ginzburg-Landau theories for $s+is$ superconducting state
• Properties of dirty two-bands superconductors with repulsive interband interaction: normal modes, length scales, vortices and magnetic response
• Supercurrent rectification with time-reversal symmetry broken multiband superconductors
• Unconventional thermoelectric effect in superconductors that break time-reversal symmetry
• Supercurrents and spontaneous time-reversal symmetry breaking by nonmagnetic disorder in unconventional superconductors
• Spontaneous time-reversal symmetry breaking by disorder in superconductors
• Phase diagram of dirty two-band superconductors and observability of impurity-induced $s+is$ state
• Polarization of spontaneous magnetic field and magnetic fluctuations in $s+is$ anisotropic multiband superconductors
• Revisiting superconductivity in the extended one-band Hubbard model: pairing via spin and charge fluctuations
• Short-time dynamics in $s+is$-wave superconductor with incipient bands
• Magnetic signatures of domain walls in $s+is$ and $s+id$ superconductors: observability and what that can tell us about the superconducting order parameter
• Effective model and Magnetic Properties of the Resistive Electron Quadrupling State
• Skyrmionic chains and lattices in $s+id$ superconductors
• Time-reversal symmetry breaking in superconductors through loop super-current order
• High-order Time-Reversal Symmetry Breaking Normal State
• Spontaneous magnetization in unitary superconductors with time reversal symmetry breaking
• Supercurrent Diode Effect in Josephson Interferometers with Multiband Superconductors
• Time-reversal symmetry breaking superconductivity in hole-doped monolayer MoS${}_2$
• Time-reversal symmetry breaking from lattice dislocations in superconductors
• Magnetic field behaviour in $s+is$ and $s+id$ superconductors: twisting of applied and spontaneous fields
• Specific Heat Investigation for Line Nodes in Heavily Overdoped Ba1-xKxFe2As2
• Spontaneous surface current in multi-component cubic superconductors with time-reversal symmetry breaking
• Spontaneous edge corner currents in $s+is$ superconductors and time reversal symmetry breaking surface states