Possibility of chiral $d$-wave state in the hexagonal pnictide superconductor SrPtAs

Abstract

We discuss the type of pairing in the hexagonal pnictide superconductor SrPtAs, taking into account its multiband structure. The topological chiral $d$-wave state with time-reversal-symmetry breaking has been anticipated from the spontaneous magnetization observed by the muon-spin-relaxation experiment. We point out in this paper that the recent experimental reports on the nuclear-spin-lattice relaxation rate $T_1^{-1}$ and superfluid density $n_s(T)$, which seemingly support the conventional $s$-wave pairing, are also consistent with the chiral $d$-wave state. The compatibility of the gap and multiband structures is crucial in this argument.

6 pages, 8 figures, accepted for publication in Phys. Rev. B

References in corpus (6)

• Superconductivity in the Honeycomb-Lattice Pnictide SrPtAs
• Possible pairing symmetries in SrPtAs with a local lack of inversion center
• Nuclear magnetic relaxation and superfluid density in Fe-pnictide superconductors: An anisotropic \pm s-wave scenario
• Spin-singlet superconductivity with a full gap in locally non-centrosymmetric SrPtAs
• Surface magnetism in a chiral d-wave superconductor with hexagonal symmetry
• Gap function of hexagonal pnictide superconductor SrPtAs from quasiparticle interference spectrum