Robust odd-parity superconductivity in the doped topological insulator Nb${}_x$Bi${}_2$Se${}_3$

Abstract

We present resistivity and magnetization measurements on proton-irradiated crystals demonstrating that the superconducting state in the doped topological superconductor Nb${}_x$Bi${}_2$Se${}_3$ (x = 0.25) is surprisingly robust against disorder-induced electron scattering. The superconducting transition temperature $T_c$ decreases without indication of saturation with increasing defect concentration, and the corresponding scattering rates far surpass expectations based on conventional theory. The low-temperature variation of the London penetration depth $\Delta \lambda (T)$ follows a power law ($\Delta \lambda (T)\sim T^2$) indicating the presence of symmetry-protected point nodes. Our results are consistent with the proposed robust nematic $E_u$ pairing state in this material.

6 pages, 5 figures

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Cited by in corpus (35)

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• Nematic superconductivity stabilized by density wave fluctuations: Possible application to twisted bilayer graphene
• Conventional Superconductivity in Type II Dirac Semimetal PdTe${}_2$
• $Z_3$-vestigial nematic order due to superconducting fluctuations in the doped topological insulator Nb${}_x$Bi${}_2$Se${}_3$ and Cu${}_x$Bi${}_2$Se${}_3$
• Structural distortion behind the nematic superconductivity in Sr${}_x$Bi${}_2$Se${}_3$
• Generalized Anderson's theorem for superconductors derived from topological insulators
• Nanocalorimetric Evidence for Nematic Superconductivity in the Doped Topological Insulator Sr${}_{0.1}$Bi${}_2$Se${}_3$
• Direction and symmetry transition of the vector order parameter in topological superconductors Cu${}_x$Bi${}_2$Se${}_3$
• Possible structural origin of superconductivity in Sr-doped Bi2Se3
• Time-reversal symmetry breaking and multigap superconductivity in the noncentrosymmetric superconductor La${}_7$Ni${}_3$
• Chiral Higgs Mode in Nematic Superconductors
• The soft-mode phonons mediated unconventional superconductivity in monolayer 1T'-WTe2
• Nematic Superconductivity in Cu1.5(PbSe)5(Bi2Se3)6
• Evidence for Unconventional Superconductivity and Nontrivial Topology in PdTe
• Time-reversal invariant and fully gapped unconventional superconducting state in the bulk of the topological Nb0.25Bi2Se3
• Superconductivity, pairing symmetry, and disorder in the doped topological insulator Sn${}_{1-x}$In${}_x$Te for x $\ge$ 0.10
• Low-energy excitations and non-BCS superconductivity in Nb${}_x$-Bi${}_2$Se${}_3$
• Power-law Temperature Dependence of the Penetration Depth in a Topological Superconductor due to Surface States
• $\require{mhchem}$Misfit phase $\ce{(BiSe)_{$1.10$}NbSe2}$ as the origin of superconductivity in nobium-doped bismuth selenide
• Higher-order topological semimetals and nodal superconductors with an order-two crystalline symmetry
• The effect of interorbital scattering on superconductivity in doped Dirac materials
• Phonon-induced rotation of the electronic nematic director in superconducting Bi${}_2$Se${}_3$
• Time-reversal-symmetry Breaking in the Superconducting State of ScS
• Unusual upper critical fields of the topological nodal-line semimetal candidate Sn${}_x$NbSe${}_{2-\delta }$
• Lifshitz transition in dirty nematic superconductor
• An increase in $T_c$ under hydrostatic pressure in the superconducting doped topological insulator Nb${}_{0.25}$Bi${}_2$Se${}_3$
• Anisotropic Upper Critical Field, Seebeck and Nernst Coefficient in Nb0.20Bi2Se3 Topological Superconductor
• Bound states around impurities in a superconducting bilayer
• Introduction of Sr into Bi2Se3 thin films by molecular beam epitaxy
• Visualizing Pairing Symmetry in Nematic Superconductors using spin-polarized spectroscopy of magnetic impurities
• Odd-frequency pairs and anomalous proximity effect in nematic and chiral states of superconducting topological insulators
• How spectrum-wide quantum criticality protects surface states of topological superconductors from Anderson localization: Quantum Hall plateau transitions (almost) all the way down
• Fermi Surface Topology and Magneto-transport Properties of Superconducting Pd${}_3$Bi${}_2$Se${}_2$
• Unconventional superconductivity from electronic dipole fluctuations
• Sensitivity of superconducting states to the impurity location in layered materials