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.

4 figs, 4+5 pages

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Cited by in corpus (14)

• Distinguishing between $s+id$ and $s+is$ pairing symmetries in multiband superconductors through spontaneous magnetization pattern induced by a defect
• Supercurrent rectification with time-reversal symmetry broken multiband superconductors
• 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
• Revisiting superconductivity in the extended one-band Hubbard model: pairing via spin and charge fluctuations
• Effective model and Magnetic Properties of the Resistive Electron Quadrupling State
• Skyrmionic chains and lattices in $s+id$ superconductors
• 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 from lattice dislocations in superconductors
• Magnetic field behaviour in $s+is$ and $s+id$ superconductors: twisting of applied and spontaneous fields
• Spontaneous edge corner currents in $s+is$ superconductors and time reversal symmetry breaking surface states