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

Abstract

We report ^{11}B NMR measurements in non-centrosymmetric superconductors Mg_{9.3}Ir_{19}B_{16.7} (T_c=5.8 K) and Mg_{10.5}Ir_{19}B_{17.1} (T_c=4.8 K). The spin lattice relaxation rate and the Knight shift indicate that the Cooper pairs are predominantly in the spin-singlet state with an isotropic gap. However, Mg_{10.5}Ir_{19}B_{17.1} is found to have more defects and the spin susceptibility remains finite even in the zero-temperature limit. We interpret this result as that the defects enhance the spin-orbit coupling and bring about more spin-triplet component.

for a proper, high-resolution Fig.5, contact the corresponding author

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
• Superconductivity in Rh${}_2$Ga${}_9$ and Ir${}_2$Ga${}_9$ without Inversion Symmetry
• Gap structure in noncentrosymmetric superconductors
• Physical properties of noncentrosymmetric superconductor Ru${}_7$B${}_3$
• 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
• Signature of superconducting states in cubic crystal without inversion symmetry

Cited by in corpus (6)

• Abrupt enhancement of non-centrosymmetry and appearance of the spin-triplet superconducting state in Li_2(Pd_{1-x}Pt_{x})_3B beyond x=0.8
• Spin-singlet superconductivity with a full gap in locally non-centrosymmetric SrPtAs
• Full-gap superconductivity in non-centrosymmetric Re${}_6$Zr, Re${}_{27}$Zr${}_5$ and Re${}_{24}$Zr${}_5$
• Antiferromagnetic spin fluctuations and superconductivity in NbRh${}_2$B${}_2$ and TaRh${}_2$B${}_2$ with a chiral crystal structure
• Pressure study of the noncentrosymmetric 5d-electron superconductors CaMSi3 (M= Ir, Pt)
• Multi-band effect in the noncentrosymmetric superconductors Mg_{12-δ}Ir_{19}B_{16} revealed by Hall effect and magnetoresistance measurements