Spontaneous currents in a superconductor with s+is symmetry

Saurabh Maiti; Manfred Sigrist; Andrey Chubukov

doi:10.1103/PhysRevB.91.161102

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Spontaneous currents in a superconductor with s+is symmetry

Saurabh Maiti, Manfred Sigrist, Andrey Chubukov

DOI 10.1103/PhysRevB.91.161102 · Physical Review B

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Abstract

We analyze the s+is state that is proposed as a candidate superconducting state for strongly hole-doped Ba1−xKxFe2As2. Such a state breaks time-reversal symmetry (TRS) but does not break any other discrete symmetry. We address the issue as to whether TRS breaking alone can generate spontaneous currents near impurity sites, which could be detected in, e.g., muon spin relaxation 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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Ba1-xKxFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
KFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Sr2RuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
SrPtAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown