Multigap superconductivity in locally non-centrosymmetric SrPtAs: An As nuclear quadrupole resonance investigation

Abstract

We report detailed ${}^{75}$As-NQR investigations of the locally non-centrosymmetric superconductor SrPtAs. The spin-lattice relaxation studies prove weakly coupled multi-gap superconductivity. The Hebel-Slichter peak, a hallmark of conventional superconductivity, is strongly suppressed, which points to an unconventional superconducting state. The observed behavior excludes a superconducting order parameter with line nodes and is consistent with proposed $f$-wave and chiral $d$-wave order parameters.

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Cited by in corpus (13)

• Chiral Superconductors
• Chiral d-wave superconductivity in doped graphene
• Recent progress on superconductors with time-reversal symmetry breaking
• Unconventional superconducting gap structure protected by space group symmetry
• Classification of topological crystalline superconducting nodes on high-symmetry lines: Point nodes, line nodes, and Bogoliubov Fermi surfaces
• Superconductivity in Hexagonal BaPtAs: SrPtSb- and YPtAs-type Structures with Ordered Honeycomb Network
• Symmetry and Gap Classification of the non-symmorphic SrPtAs
• Superconductivity in BaPtSb with an Ordered Honeycomb Network
• High-resolution magnetic penetration depth and inhomogeneities in locally noncentrosymmetric SrPtAs
• Accessing topological superconductivity via a combined STM and renormalization group analysis
• Suppression of ferromagnetic spin fluctuations in the filled skutterudite superconductor SrOs4As12 revealed by 75As NMR-NQR measurements
• Spontaneous magnetic field and disorder effects in BaPtAs_1-x_Sb_x_ with honeycomb network
• Possible Pairing Symmetry of BaPtAs${}_{1-x}$Sb${}_x$ with an Ordered Honeycomb Network