Multigap Superconductivity in Chiral Noncentrosymmetric TaRh${}_2$B${}_2$

Abstract

We report the first observation of multigap superconductivity in TaRh${}_2$B${}_2$. We show TaRh${}_2$B${}_2$ is a bulk type-II superconductor with a transition temperature, $T_{\mathrm{c}}=6.00(5)$ K. We present transverse-field muon spin relaxation data where the superconducting gap can be fit using a two-gap $\left(s+s\right)$-wave model. We also report the zero-field electronic specific heat in the superconducting state that is best described by the same $\left(s+s\right)$ model providing further evidence of multiband behavior in this superconductor. Zero-field muon spin relaxation measurements show time-reversal symmetry is preserved in the superconducting state. We demonstrate that TaRh${}_2$B${}_2$ has an upper critical field of $15.2(1)$ T, which is significantly higher than previously reported and exceeds the Pauli limit.

arXiv comment5 pages, 3 figures. Accepted for publication in Physical Review B

References in corpus (29)

• Superconductivity in Iron Compounds
• Time-Reversal Symmetry Breaking Superconductivity in Sr2RuO4
• Beyond Eliashberg superconductivity in MgB2: anharmonicity, two-phonon scattering, and multiple gaps
• Enhancement of the upper critical field by nonmagnetic impurities in dirty two-gap superconductors
• Specific Heat of Mg ^{11}B_2
• Superconductivity and spin-orbit coupling in non-centrosymmetric materials: a review
• High Temperature Superconductivity in Iron Pnictides and Chalcogenides
• S-wave/spin-triplet order in superconductors without inversion symmetry: Li${}_2$Pd${}_3$B and Li${}_2$Pt${}_3$B
• Two-Band Superconductivity in MgB2
• Chiral Superconductors
• Phenomenological two-gap model for the specific heat of MgB_2
• Evidence for time-reversal symmetry breaking in the non-centrosymmetric superconductor LaNiC${}_2$
• Spin Triplet Superconducting State due to Broken Inversion Symmetry in Li_2Pt_3B
• Evidence for Time-Reversal-Symmetry-Broken Superconductivity in Locally Noncentrosymmetric SrPtAs
• Theoretical aspects of Andreev spectroscopy and tunneling spectroscopy in non-centrosymmetric superconductors: a topical review
• Observation of Time-Reversal Symmetry Breaking in the Non-Centrosymmetric Superconductor Re6Zr
• Chiral $d$-wave Superconductivity in SrPtAs
• A review of two-band superconductivity: materials and effects on the thermodynamic and reversible mixed-state properties
• Unconventional superconductivity in weakly correlated, non-centrosymmetric $\mathrm{M}{\mathrm{o}}_3\mathrm{A}{\mathrm{l}}_2\mathrm{C}$
• Structure and physical properties of the noncentrosymmetric superconductor Mo3Al2C
• Specific heat measurements of the gap structure of the organic superconductors kappa-(ET)_2Cu[N(CN)_2]Br and kappa-(ET)_2Cu(NCS)_2
• Specific heat evidence for two-gap superconductivity in ternary-iron silicide Lu${}_2$Fe${}_3$Si${}_5$
• High-Field Pauli-Limiting Behavior and Strongly Enhanced Upper Critical Magnetic Fields near the Transition Temperature of an Arsenic-Deficient LaO_0.9F_0.1FeAs_(1-δ) Superconductor
• Multigap superconductivity in sesquicarbides La${}_2$C${}_3$ and Y${}_2$C${}_3$
• Superconductivity with extremely large upper critical fields in Nb2Pd0.81S5
• Superconductivity at 6 K and the violation of Pauli limit in Ta2PdxS5
• Two-gap superconductivity in Lu${}_2$Fe${}_3$Si${}_5$: a transverse-field muon spin rotation study
• Anomalous thermodynamic power laws near topological transitions in nodal superconductors
• Nodeless superconductivity in quasi-one-dimensional Nb2PdS5: A muSR study

Cited by in corpus (12)

• Experimental Detection of the Quantum Phases of a Three-Dimensional Topological Insulator on a Spin Quantum Simulator
• NbIr${}_2$B${}_2$ and TaIr${}_2$B${}_2$ -- new low symmetry noncentrosymmetric superconductors with strong spin orbit coupling
• Time-reversal symmetry breaking and multigap superconductivity in the noncentrosymmetric superconductor La${}_7$Ni${}_3$
• Superconductivity and the upper critical field in the chiral noncentrosymmetric superconductor NbRh${}_2$B${}_2$
• Evidence for the coexistence of time-reversal symmetry breaking and Bardeen-Cooper-Schrieffer-like superconductivity in La${}_7$Pd${}_3$
• Nodeless s-wave superconductivity in the α-Mn structure type noncentrosymmetric superconductor TaOs: A μSR study
• Spectroscopic evidence of multi-gap superconductivity in non-centrosymmetric AuBe
• Superconducting and structural properties of non-centrosymmetric Re6Hf superconductor under high pressure
• Time reversal invariant single gap superconductivity with upper critical field larger than Pauli limit in NbIr${}_2$B${}_2$
• Anisotropic superconductivity and unusually robust electronic critical field in single crystal La${}_7$Ir${}_3$
• Single-gap two-band superconductivity well above the Pauli limit in non-centrosymmetric TaIr${}_2$B${}_2$
• Topological superconductivity in helical crystals