Superconductivity in PtPb${}_4$ with Possible Nontrivial Band Topology

Abstract

Superconductivity in topological quantum materials is much sought after as it represents the key avenue to searching for topological superconductors, which host a full pairing gap in the bulk but Majorana bound states at the surface. To date, however, the simultaneous realization of nontrivial band topology and superconductivity in the same material under ambient conditions remains rare. In this paper, we study both superconducting and topological properties of a binary compound PtPb${}_4$ ($T_c$ $\sim$ 2.7 K) that was recently reported to exhibit large Rashba splitting, inherent to the heavy 5$d$ Pt and 6$p$ Pb. We show that in PtPb${}_4$, the specific heat jump at $T_c$ reaches $\Delta C/\gamma T_c$$\sim$1.70$\pm 0.04$, larger than 1.43 expected for the weak-coupling BCS superconductors. Moreover, the measurement of quantum oscillation suggests the possibility for a topological band structure, which is further studied by density functional theory calculations. Our study may stimulate future experimental and theoretical investigations in this intriguing material.

References in corpus (38)

• Topological Insulators
• Topological insulators and superconductors
• Weyl and Dirac Semimetals in Three Dimensional Solids
• WannierTools: An open-source software package for novel topological materials
• A More Accurate Generalized Gradient Approximation for Solids
• Experimental discovery of Weyl semimetal TaAs
• Titanic Magnetoresistance in WTe2
• Topological superconductors: a review
• Observation of the chiral anomaly induced negative magneto-resistance in 3D Weyl semi-metal TaAs
• Extremely large magnetoresistance and ultrahigh mobility in the topological Weyl semimetal NbP
• Odd-Parity Topological Superconductors: Theory and Application to Cu${}_x$Bi${}_2$Se${}_3$
• Dirac Cone Protected by Non-Symmorphic Symmetry and 3D Dirac Line Node in ZrSiS
• Topological Semimetals
• Computing topological invariants without inversion symmetry
• Negative Magnetoresistance in Dirac Semimetal Cd3As2
• Observation of Topological Nodal Fermion Semimetal Phase in ZrSiS
• Field-induced superconducting phase of FeSe in the BCS-BEC cross-over
• Linear magnetoresistance caused by mobility fluctuations in the n-doped Cd3As2
• Spin-Rotation Symmetry Breaking in the Superconducting State of CuxBi2Se3
• Discovery of Dirac Node Arcs in PtSn4
• Numerical extraction of de Haas - van Alphen frequencies from calculated band energies
• Superconducting Topological Surface States in Non-centrosymmetric Bulk Superconductor PbTaSe2
• Origin of the turn-on temperature behavior in WTe${}_2$
• Anisotropic Fermi Surface and Quantum Limit Transport in High Mobility 3D Dirac Semimetal Cd3As2
• Rules for Phase Shifts of Quantum Oscillations in Topological Nodal-line Semimetals
• Extremely large magnetoresistance and Kohler's rule in PdSn4: a complete study of thermodynamic, transport and band structure properties
• Modern semiclassical theory of magnetic transport and breakdown
• Z${}_2$ topology and superconductivity from symmetry lowering of a 3D Dirac Metal Au${}_2$Pb
• Topo-fermiology
• Origin of the Extremely Large Magnetoresistance in the Semimetal YSb
• Spin-Triplet Vortex State in the Topological Superconductor CuxBi2Se3
• Evidence for nematic superconductivity of topological surface states in PbTaSe2
• Chiral singlet superconductivity in the weakly correlated metal LaPt3P
• A de Hass-van Alphen study of the Type-II Dirac semimetal candidates $A$Te${}_2$ ($A=$ Pt, Pd)
• Electronic structure of topological superconductor candidate Au${}_2$Pb
• Strong anisotropy of electron-phonon interaction in NbP probed by magnetoacoustic quantum oscillations
• Large spin to charge conversion in topological superconductor \b{eta}-PdBi2 at room temperature
• Evidence for large Rashba splitting in PtPb4 from Angle-Resolved Photoemission Spectroscopy

Cited by in corpus (4)

• Superconducting density of states of PtPb4
• Experimental detection of topological electronic state and large linear magnetoresistance in $SrS{n}_4$ superconductor
• Visualization of Unconventional Rashba Band and Vortex Zero Mode in Topopogical Superconductor Candidate AuSn${}_4$
• Intrinsic defect intolerance in the ultra-pure metal PtSn${}_4$