Superconductivity in topologically nontrivial material Au2Pb

Abstract

The search for nontrivial superconductivity in novel quantum materials is currently a most attractive topic in condensed matter physics and material science. The experimental studies have progressed quickly over the past couple of years. In this article, we report systematic studies of superconductivity in Au2Pb single crystals. The bulk superconductivity (onset transition temperature, Tconset= 1.3 K) of Au2Pb is characterized by both transport and diamagnetic measurements, where the upper critical field Hc2 shows unusual quasi-linear temperature dependence. The superconducting gap is revealed by point contact measurement with gold tip. However, when using tungsten (W) tip, which is much harder, the superconducting gap probed is largely enhanced as demonstrated by the increases of both Tconset and upper critical field (Hc2). This can be interpreted as a result of increase in density of states under external anisotropic stress imposed by the tip, as revealed by first-principles calculations. Furthermore, novel phase winding of the pseudospin texture along k-space loops around the Fermi energy is uncovered from the calculations, indicating that the observed superconductivity in Au2Pb may have nontrivial topology.

References in corpus (31)

• Classification of topological insulators and superconductors in three spatial dimensions
• Type-II Weyl Semimetals
• Discovery of a Three-dimensional Topological Dirac Semimetal, Na3Bi
• Dirac semimetal and topological phase transitions in A3Bi (A=Na, K, Rb)
• Periodic table for topological insulators and superconductors
• Dirac semimetal in three dimensions
• Three Dimensional Dirac Semimetal and Quantum Transports in Cd3As2
• Ultrahigh mobility and giant magnetoresistance in the Dirac semimetal Cd${}_3$As${}_2$
• Observation of a topological 3D Dirac semimetal phase in high-mobility Cd3As2
• Experimental Realization of a Three-Dimensional Dirac Semimetal
• Very High Field Two-Band Superconductivity in LaFeAsO_0.89F_0.11
• Landau Quantization and Quasiparticle Interference in the Three-Dimensional Dirac Semimetal Cd3As2
• Quantum transport evidence for a three-dimensional Dirac semimetal phase in Cd3As2
• Andreev - Saint James reflections: a probe of cuprate superconductors
• Linear magnetoresistance caused by mobility fluctuations in the n-doped Cd3As2
• Fermi Surface Topological Invariants for Time Reversal Invariant Superconductors
• Two-dimensional Transport Induced Linear Magneto-Resistance in Topological Insulator Bi${}_2$Se${}_3$ Nanoribbons
• Observation of superconductivity in 3D Dirac semimetal Cd3As2 crystal
• Probing multiband superconductivity by point-contact spectroscopy
• Topological $R$PdBi half-Heusler semimetals: a new family of non-centrosymmetric magnetic superconductors
• Topological Aspect and Quantum Magnetoresistance of $\beta$-Ag${}_2$Te
• The role of critical current on point contact Andreev Reflection spectrum between a normal metal and a superconductor
• Anisotropic Magnetotransport and Exotic Longitudinal Linear Magnetoresistance in WTe2 Crystals
• Unconventional Superconductivity at Mesoscopic Point-contacts on the 3-Dimensional Dirac Semi-metal Cd${}_3$As${}_2$
• Topological superconductivity in Dirac semimetals
• Demonstration of surface transport in a hybrid Bi2Se3/Bi2Te3 heterostructure
• Z${}_2$ topology and superconductivity from symmetry lowering of a 3D Dirac Metal Au${}_2$Pb
• Tunneling spectroscopy of topological superconductors
• Temperature - Pressure phase diagram of the cubic Laves phase Au${}_2$Pb
• Enhanced superconductivity at the interface of W/Sr${}_2$RuO${}_4$ point contact
• Pressure-induced superconductivity in the three-dimensional Dirac semimetal Cd3As2

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• Probing the topological surface states in superconducting Sn4Au single crystal: A magneto transport study
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• Intrinsic superconducting diode effects in tilted Weyl and Dirac semimetals
• Superconducting density of states and bandstructure at the surface of the candidate topological superconductor Au2Pb
• Bulk superconductivity and non-trivial band topology analysis of Pb2Pd
• Nodal S-wave Superconductivity in Antiferromagnetic Semimetals
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• Free-carrier dynamics in Au${}_2$Pb probed by optical conductivity measurements
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• Fully gapped superconducting state in Au2Pb: a natural candidate for topological superconductor
• Systematic electrochemical etching of various metal tips for tunneling spectroscopy and scanning probe microscopy
• Experimental detection of topological electronic state and large linear magnetoresistance in $SrS{n}_4$ superconductor
• Emergence of Topological Superconductivity in Doped Topological Dirac Semimetals under Symmetry-Lowering Lattice Distortions
• Double Majorana Vortex Flat Bands in the Topological Dirac Superconductor
• Giant Enhancement of Superconductivity in Zr Point Contacts
• Reply to Comment on "Tip induced unconventional superconductivity on Weyl semimetal TaAs"
• Superconducting topological Dirac semimetals: $P6/m$-Si${}_6$ and $P6/m$-NaSi${}_6$
• Longitudinal Magnetoresistance in YBa${}_2$Cu${}_3$O${}_7$ at High Magnetic Fields of up to 100 T