Muon spin rotation/relaxation measurements of the non-centrosymmetric superconductor Mg10Ir19B16

Abstract

We have searched for time-reversal symmetry breaking fields in the non-centrosymmetric superconductor Mg${}_{10}$Ir${}_{19}$B${}_{16}$ via muon spin relaxation in zero applied field, and we measured the temperature dependence of the superfluid density by muon spin rotation in transverse field to investigate the superconducting pairing symmetry in two polycrystalline samples of signficantly different purities. In the high purity sample, we detected no time-reversal symmetry breaking fields greater than 0.05 G. The superfluid density was also found to be exponentially-flat as T$\to$0, and so can be fit to a single-gap BCS model. In contrast, the lower purity sample showed an increase in the zero-field $\mu$SR relaxation rate below T${}_c$ corresponding to a characteristic field strength of 0.6 G. While the temperature-dependence of the superfluid density was also found to be consistent with a single-gap BCS model, the magnitude as T$\to$0 was found to be much lower for a given applied field than in the case of the high purity sample. These findings suggest that the dominant pairing symmetry in high quality Mg${}_{10}$Ir${}_{19}$B${}_{16}$ samples corresponds to the spin-singlet channel, while sample quality drastically affects the superconducting properties of this system.

6 pages, 5 figures, revised version resubmitted to PRB

References in corpus (8)

• Spin Triplet Superconducting State due to Broken Inversion Symmetry in Li_2Pt_3B
• Physical properties of the noncentrosymmetric superconductor Mg_10Ir_19B_16
• Muon Spin Rotation Measurement of the Magnetic Field Penetration Depth in Ba(Fe0.93 Co0.07)2 As2 : Evidence for Multiple Superconducting Gaps
• Superconductivity in Rh${}_2$Ga${}_9$ and Ir${}_2$Ga${}_9$ without Inversion Symmetry
• Muon spin rotation studies of electronic excitations and magnetism in the vortex cores of superconductors
• Nodeless Superconductivity in the Noncentrosymmetric Superconductor $M{g}_{10}I{r}_{19}{B}_{16}$
• Possible nodeless superconductivity in the noncentrosymmetric superconductor Mg_(12-delta)Ir_19B_16
• Superconducting state in the non-centrosymmetric Mg_{9.3}Ir_{19}B_{16.7} and Mg_{10.5}Ir_{19}B_{17.1} revealed by NMR

Cited by in corpus (17)

• Superconductivity and spin-orbit coupling in non-centrosymmetric materials: a review
• Observation of Time-Reversal Symmetry Breaking in the Non-Centrosymmetric Superconductor Re6Zr
• Recent progress on superconductors with time-reversal symmetry breaking
• Time-reversal symmetry breaking in Re-based superconductors
• Simultaneous Nodal Superconductivity and Time-Reversal Symmetry Breaking in the Noncentrosymmetric Superconductor CaPtAs
• Nodeless superconductivity and time-reversal symmetry breaking in the noncentrosymmetric superconductor Re24Ti5
• Time-reversal symmetry breaking in the noncentrosymmetric Zr${}_3$Ir superconductor
• Superconductivity in Noncentrosymmetric Iridium Silicide Li2IrSi3
• Structure and superconductivity in the binary Re${}_{1-x}$Mo${}_x$ alloys
• Investigations of the superconducting ground state of Zr${}_3$Ir: Introducing a new noncentrosymmetric superconductor
• Time-reversal symmetry breaking in Re-based superconductors: Recent developments
• Nodeless superconductivity in the centro- and noncentrosymmetric rhenium-boron superconductors
• Ir 5$d$-band Derived Superconductivity in LaIr${}_3$
• Nodeless s-wave superconductivity in the α-Mn structure type noncentrosymmetric superconductor TaOs: A μSR study
• Time reversal invariant single gap superconductivity with upper critical field larger than Pauli limit in NbIr${}_2$B${}_2$
• Multi-band effect in the noncentrosymmetric superconductors Mg_{12-δ}Ir_{19}B_{16} revealed by Hall effect and magnetoresistance measurements
• NbReSi: A Noncentrosymetric Superconductor with Large Upper Critical Field