Bulk Superconductivity in the Dirac Semimetal TlSb

Abstract

A feasible strategy to realize the Majorana fermions is searching for a simple compound with both bulk superconductivity and Dirac surface states. In this paper, we performed calculations of electronic band structure, the Fermi surface and surface states, as well as measured the resistivity, magnetization, specific heat for TlSb compound with a CsCl-type structure. The band structure calculations show that TlSb is a Dirac semimetal when spin-orbit coupling is taken into account. Meanwhile, we first found that TlSb is a type-II superconductor with $T_c$ = 4.38 K, $H_{c1}$(0) = 148 Oe, $H_{c2}$(0) = 1.12 T and ${\kappa }_{GL}$ = 10.6, and confirmed it to be a moderately coupled s-wave superconductor. Although we can not determine which bands near the Fermi level $E_F$ to be responsible for superconductivity, its coexistence with the topological surface states implies that TlSb compound may be a simple material platform to realize the fault-tolerant quantum computations.

7 pages, 8 figures

References in corpus (33)

• Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
• Maximally-localized generalized Wannier functions for composite energy bands
• Topological Insulators in Three Dimensions
• Maximally localized Wannier functions: Theory and applications
• WannierTools: An open-source software package for novel topological materials
• Maximally-localized Wannier functions for entangled energy bands
• Topological superconductors: a review
• Time-Reversal Symmetry Breaking Superconductivity in Sr2RuO4
• Superconductivity in CuxBi2Se3 and its implications for pairing in the undoped topological insulator
• An equivalent expression of Z2 Topological Invariant for band insulators using Non-Abelian Berry's connection
• Evidence for Majorana bound state in an iron-based superconductor
• Topological Superconductivity in CuxBi2Se3
• Superconductivity close to magnetic instability in Fe(Se1-xTex)0.82
• The Coexistence of Superconductivity and Topological Order in the Bi2Se3 Thin Films
• Saturation of electrical resistivity
• Wannier representation of Z_2 topological insulators
• $4\pi$-periodic Josephson supercurrent in HgTe-based topological Josephson junctions
• Unconventional Josephson Effect in Hybrid Superconductor-Topological Insulator Devices
• Spin-Rotation Symmetry Breaking in the Superconducting State of CuxBi2Se3
• Zero-energy vortex bound state in the superconducting topological surface state of Fe(Se,Te)
• Thermodynamic evidence for nematic superconductivity in Cu${}_x$Bi${}_2$Se${}_3$
• Superconductivity with topological surface state in SrxBi2Se3
• Observation of a Robust Zero-energy Bound State in Iron-based Superconductor Fe(Te,Se)
• Odd-Parity Pairing and Topological Superconductivity in a Strongly Spin-Orbit Coupled Semiconductor
• Fully gapped topological surface states in Bi${}_2$Se${}_3$ films induced by a d-wave high-temperature superconductor
• A Non-Centrosymmetric Superconductor with a Bulk 3D Dirac Cone Gapped by Strong Spin Orbit Coupling
• Edge states of Sr${}_2$RuO${}_4$ detected by in-plane tunneling spectroscopy
• CaTe: a new topological node-line and Dirac semimetal
• A road to reality with topological superconductors
• Atomic line defects and zero-energy end states in monolayer Fe(Te,Se) high-temperature superconductors
• Physical properties of the non-centrosymmetric superconductor Nb0.18Re0.82
• Josephson supercurrent in a topological insulator without a bulk shunt
• Zero-Energy Modes on Superconducting Bismuth Islands Deposited on Fe(Te,Se)

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• Majorana Flat Bands in the Vortex Line of Superconducting Weyl Semimetals