Coexistence of Superconductivity and Charge Density Wave in Tantalum Disulfide: Experiment and Theory

Abstract

The coexistence of charge density wave (CDW) and superconductivity in tantalum disulfide (2H-TaS${}_2$) at ambient pressure, is boosted by applying hydrostatic pressures up to 30GPa, thereby inducing a typical dome-shaped superconducting phase. The ambient pressure CDW ground state which begins at TCDW = 76 K, with critically small Fermi surfaces, was found to be fully suppressed at Pc = 8.7GPa. Around Pc, we observe a superconducting dome with a maximum superconducting transition temperature Tc = 9.1 K. First-principles calculations of the electronic structure predict that, under ambient conditions, the undistorted structure is characterized by a phonon instability at finite momentum close to the experimental CDW wave vector. Upon compression, this instability is found to disappear, indicating the suppression of CDW order. The calculations reveal an electronic topological transition (ETT), which occurs before the suppression of the phonon instability, suggesting that the ETT alone is not directly causing the structural change in the system. The temperature dependence of the first vortex penetration field has been experimentally obtained by two independent methods and the corresponding lower critical field H${}_{c1}$ was deduced. While a d wave and single-gap BCS prediction cannot describe our H${}_{c1}$ experiments, the temperature dependence of the H${}_{c1}$ can be well described by a single-gap anisotropic s-wave order parameter.

6 Pages, 4 figures

References in corpus (6)

• Gate-tunable Phase Transitions in 1T-TaS${}_2$
• Fermi surface nesting and the origin of Charge Density Waves in metals
• Entropy driven stabilization of energetically unstable crystal structures explained from first principles theory
• Tuning the Charge Density Wave and Superconductivity in CuxTaS2
• Evidence for Two Gaps and Breakdown of the Uemura Plot in Ba${}_{0.6}$K${}_{0.4}$Fe${}_2$As${}_2$ Single Crystals
• Pressure dependence of the charge-density-wave and superconducting states in GdTe${}_3$, TbTe${}_3$ and DyTe${}_3$

Cited by in corpus (13)

• Nanomaterials for Quantum Information Science and Engineering
• Intertwining of magnetism and charge ordering in kagome FeGe
• Exotic Magnetic and Electronic Properties of Layered CrI3 Single Crystals Under High Pressure
• Pressure induced nonmonotonic evolution of superconductivity in 6R-TaS2 with a natural bulk van der Waals heterostructure
• Nematic Ising superconductivity with hidden magnetism in few-layer 6R-TaS2
• Two Dimensional Multigap Superconductivity in Bulk 2H-TaSSe
• Peak in the superconducting transition temperature of the nonmagnetic topological line-nodal material CaSb${}_2$ under pressure
• Structural and electronic phase transitions in Zr${}_{1.03}$Se${}_2$ at high pressure
• Interplay of superconductivity and charge-density-wave order in kagome materials
• Enhanced superconductivity with possible re-appearance of charge density wave states in polycrystalline Cu${}_{1-x}$Ag${}_x$Ir${}_2$Te${}_4$ alloys
• Sliding phasons in Moiré Ladders
• Pressure-induced superconductivity in TiGeTe${}_6$
• Pair-mixing induced Time-reversal-breaking superconductivity