Pure nematic quantum critical point accompanied by a superconducting dome

Abstract

When a symmetry-breaking phase of matter is suppressed to a quantum critical point (QCP) at absolute zero, quantum-mechanical fluctuations proliferate. Such fluctuations can lead to unconventional superconductivity, as evidenced by the superconducting domes often found near magnetic QCPs in correlated materials. However, it remains unclear whether this superconductivity mechanism holds for QCPs of the electronic nematic phase, characterized by rotational symmetry breaking. Here, we demonstrate from systematic elastoresistivity measurements that nonmagnetic FeSe${}_{1-x}$Te${}_x$ exhibits an electronic nematic QCP showing diverging nematic susceptibility. This finding establishes two nematic QCPs in FeSe-based superconductors with contrasting accompanying phase diagrams. In FeSe${}_{1-x}$Te${}_x$, a superconducting dome is centered at the QCP, whereas FeSe${}_{1-x}$S${}_x$ shows no QCP-associated enhancement of superconductivity. We find that this difference is related to the relative strength of nematic and spin fluctuations. Our results in FeSe${}_{1-x}$Te${}_x$ present the first case in support of the superconducting dome being associated with the pure nematic QCP.

arXiv commentSubmitted version. 9 pages, 7 figures (including Supplementary Information)

References in corpus (44)

• Observation of topological superconductivity on the surface of an iron-based superconductor
• Nematic Fermi Fluids in Condensed Matter Physics
• Superconductivity close to magnetic instability in Fe(Se1-xTex)0.82
• Incommensurate magnetic order in the alpha-Fe(Te,Se) superconductor systems
• Intra-unit-cell electronic nematicity of the high-Tc copper-oxide pseudogap states
• Divergent nematic susceptibility in an iron arsenide superconductor
• Broken rotational symmetry in the pseudogap phase of a high-Tc superconductor
• First-order magnetic and structural phase transitions in Fe${}_{1+y}$Se${}_x$Te${}_{1-x}$
• Reply to Comment on "Unconventional s-wave superconductivity in Fe(Se,Te)"
• Bulk Superconductivity at 14 K in Single Crystals of Fe1+yTexSe1-x
• Quantum critical point lying beneath the superconducting dome in iron-pnictides
• Quantum Criticality
• Ubiquitous signatures of nematic quantum criticality in optimally doped Fe-based superconductors
• Enhancement of superconductivity near a nematic quantum critical point
• Dome-shaped magnetic order competing with high-temperature superconductivity at high pressures in FeSe
• Origin of the tetragonal-to-orthorhombic (nematic) phase transition in FeSe: a combined thermodynamic and NMR study
• Nematic quantum critical point without magnetism in FeSe1-xSx superconductors
• Quasiparticle mass enhancement approaching optimal doping in a high-Tc superconductor
• Superconductivity and non-Fermi liquid behavior near a nematic quantum critical point
• Observation of universal strong orbital-dependent correlation effects in iron chalcogenides
• Exotic Superconducting States in FeSe-based Materials
• Origin of the Resistivity Anisotropy in the Nematic Phase of FeSe
• Maximizing Tc by tuning nematicity and magnetism in FeSe1-xSx superconductors
• Electronic in-plane symmetry breaking at field-tuned quantum criticality in CeRhIn5
• Two distinct superconducting pairing states divided by the nematic end point in FeSe${}_{1-x}$S${}_x$
• Charge induced nematicity in FeSe
• Highly Anisotropic Superconducting Gap in Nematically Ordered and Tetragonal Phases of FeSe${}_{1-x}$S${}_x$
• Suppression of electronic correlations by chemical pressure from FeSe to FeS
• Review of annealing effects and superconductivity in Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$ superconductors
• Lattice effects on nematic quantum criticality in metals
• Quenched nematic criticality separating two superconducting domes in an iron-based superconductor under pressure
• Sixfold enhancement of superconductivity in a tunable electronic nematic system
• Drastic suppression of superconducting $T_c$ by anisotropic strain near a nematic quantum critical point
• Nematic Fluctuations in the Cuprate Superconductor Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$
• Divergent nematic susceptibility near the pseudogap critical point in a cuprate superconductor
• Topological Ultranodal pair states in iron-based superconductors
• Correlation between Superconductivity and Magnetic Fluctuations in Fe(Se1-xSx) Revealed by 77Se NMR
• Pairing instability near a lattice-influenced nematic quantum critical point
• Two-electronic component behavior in the multiband FeSe${}_{0.42}$Te${}_{0.58}$ superconductor
• Incoherent-coherent crossover and the pseudogap in Te-annealed superconducting Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$ revealed by magnetotransport measurements
• Lattice-Shifted Nematic Quantum Critical Point in FeSe${}_{1-x}$S${}_x$
• Tests of nematic-mediated superconductivity applied to Ba${}_{1-x}$Sr${}_x$Ni${}_2$As${}_2$
• Nematic Fluctuations in an Orbital Selective Superconductor Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$
• Superconductivity and phonon self-energy effects in Fe${}_{1+y}$Te${}_{0.6}$Se${}_{0.4}$

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• Enhanced superconducting pairing strength near a nonmagnetic nematic quantum critical point
• Spontaneous orbital polarization in the nematic phase of FeSe
• Nematic Bogoliubov Fermi surfaces from magnetic toroidal order in FeSe${}_{1-x}$S${}_x$
• Bulk and surface Dirac states accompanied by two superconducting domes in FeSe-based superconductors
• Nematic Fluctuations in an Orbital Selective Superconductor Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$
• Resurgence of superconductivity and the role of $d_{xy}$ hole band in FeSe${}_{1-x}$Te${}_x$
• Charge Transport in Ba${}_{1-x}$Rb${}_x$Fe${}_2$As${}_2$ Single Crystals
• Uniaxial stress effect on the electronic structure of quantum materials
• Theories for charge-driven nematicity in kagome metals
• Diverse Exotic Orders and Fermiology in Fe-based Superconductors: A Unified Mechanism for $B_{1g}/B_{2g}$ Nematicity in FeSe/(Cs,Rb)Fe${}_2$As${}_2$ and Smectic Order in BaFe${}_2$As${}_2$
• Upper critical fields in high-$T_{\mathrm{c}}$ superconductors
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• Non-Fermi liquid transport and strong mass enhancement near the nematic quantum critical point in FeSe${}_x$Te${}_{1-x}$ thin films
• Studies of superconductivity of Fe chalcogenides in films grown by PLD technique
• Crossover of Superconductivity across the antiferromagnetic end point in FeSe${}_{1-\mathrm{x}}$S${}_{\mathrm{x}}$ under pressure
• Development of microwave surface elastoresistivity measurement technique under tunable strain
• Piezostrain-induced in-plane anisotropy of superconducting transition temperature for FeSe0.5Te0.5 thin films
• Superconductivity near an Ising nematic quantum critical point in two dimensions
• A Landau Theory for Pair Density Modulation in Fe(Te,Se) flakes
• Boost of critical current density near quantum critical points in FeSe-Based superconductors with two superconducting domes