Time reversal invariant single gap superconductivity with upper critical field larger than Pauli limit in NbIr${}_2$B${}_2$

Abstract

Recently, compounds with noncentrosymmetric crystal structure have attracted much attention for providing a rich playground in search for unconventional superconductivity. NbIr${}_2$B${}_2$ is a new member to this class of materials harboring superconductivity below $T_{\mathrm{c}}=7.3(2)$~K and very high upper critical field that exceeds Pauli limit. Here we report on muon spin rotation ($\mu$SR) experiments probing the temperature and field dependence of effective magnetic penetration depth in this compound. Our transverse-field -$\mu$SR results suggest a fully gaped $s$-wave superconductvity. Further, the estimated high value of upper critical field is also supplemented by high field transport measurements. Remarkably, the ratio $T_{\mathrm{c}}$/${\lambda }^{-2}(0)$ obtained for NbIr${}_2$B${}_2$ ($\sim$2) is comparable to those of unconventional superconductors. Zero-field $\mu$SR data reveals no significant change in the muon spin relaxation rate above and below $T_{\mathrm{c}}$, evincing that time-reversal symmetry is preserved in the superconducting state. The presented results will stimulate theoretical investigations to obtain a microscopic understanding of the origin of superconductivity with preserved time reversal symmetry in this unique noncentrosymmetric system.

arXiv comment8 pages, 4 figures. arXiv admin note: text overlap with arXiv:2101.08234

References in corpus (34)

• Heavy fermion superconductivity and magnetic order in non-centrosymmetric $CeP{t}_{3}Si$
• Time-Reversal Symmetry Breaking Superconductivity in Sr2RuO4
• musrfit: A free platform-independent framework for muSR data analysis
• Superconductivity and spin-orbit coupling in non-centrosymmetric materials: a review
• Magnetic Penetration Depth in Unconventional Superconductors
• Properties of the Ideal Ginzburg-Landau Vortex Lattice
• Evidence for time-reversal symmetry breaking in the non-centrosymmetric superconductor LaNiC${}_2$
• Observation of Time-Reversal Symmetry Breaking in the Non-Centrosymmetric Superconductor Re6Zr
• Possible topologically non-trivial superconducting order parameter in type-II Weyl semimetal T_d-MoTe_2
• Recent progress on superconductors with time-reversal symmetry breaking
• The new versatile general purpose surface-muon instrument (GPS) based on silicon photomultipliers for $\mu$SR measurements on a continuous-wave beam
• Time-reversal symmetry breaking in Re-based superconductors
• Searching for triplet superconductivity in the Quasi-One-Dimensional K2Cr3As3
• Time-reversal symmetry breaking in noncentrosymmetric superconductor Re6Hf:further evidence for unconventional behaviour in the alpha-Mn family of materials
• Muon-Spin-Rotation Measurements of the Penetration Depth in the Infinite-Layer Electron-Doped Cuprate Superconductor Sr0.9La0.1CuO2
• Direct evidence for the emergence of a pressure induced nodal superconducting gap in the iron-based superconductor Ba_0.65Rb_0.35Fe_2As_2
• NbIr${}_2$B${}_2$ and TaIr${}_2$B${}_2$ -- new low symmetry noncentrosymmetric superconductors with strong spin orbit coupling
• Two-band superconductivity featuring different anisotropies in the ternary iron silicide Lu${}_2$Fe${}_3$Si${}_5$
• Muon spin rotation/relaxation measurements of the non-centrosymmetric superconductor Mg10Ir19B16
• Time-reversal symmetry breaking and multigap superconductivity in the noncentrosymmetric superconductor La${}_7$Ni${}_3$
• Multiple-gap response of type-I noncentrosymmetric BeAu superconductor
• Probing the superconducting gap structure in the noncentrosymmetric topological superconductor ZrRuAs
• Multigap Superconductivity in a charge density wave superconductor LaPt2Si2
• Time-reversal invariant and fully gapped unconventional superconducting state in the bulk of the topological Nb0.25Bi2Se3
• Multigap Superconductivity in Chiral Noncentrosymmetric TaRh${}_2$B${}_2$
• Mutual independence of critical temperature and superfluid density under pressure in optimally electron-doped superconducting LaFeAsO${}_{1-x}$F${}_x$
• Time-reversal symmetry breaking in Re-based superconductors: Recent developments
• Superconducting properties of the non-centrosymmetric Superconductors TaXSi (X= Re, Ru)
• Superconductivity and the upper critical field in the chiral noncentrosymmetric superconductor NbRh${}_2$B${}_2$
• Multigap superconductivity in the Mo${}_5$PB${}_2$ boron-phosphorus compound
• Superconductivity in noncentrosymmetric NbReSi investigated by muon spin rotation and relaxation
• Unconventional pressure dependence of the superfluid density in the nodeless topological superconductor $\alpha$-PdBi${}_2$
• Topological properties of non-centrosymmetric superconductors $T$Ir${}_2$B${}_2$ ($T$=Nb, Ta)
• Effect of equatorial line nodes on upper critical field and London penetration depth