Delocalized fermions in underdoped cuprates

Abstract

Low temperature heat transport was used to investigate the ground state of high-purity single crystals of the lightly-doped cuprate YBa${}_2$Cu${}_3$O${}_{6.33}$. Samples were measured on either side of the superconducting phase boundary, in both zero and applied magnetic field. We report the observation of delocalized fermionic excitations at zero energy in the non-superconducting state, which shows that the ground state of underdoped cuprates is metallic. Its low-energy spectrum appears to be similar to that of the d-wave superconductor, i.e. nodal. The insulating ground state observed in underdoped La${}_{2-x}$Sr${}_x$CuO${}_4$ is attributed to the competing spin-density-wave order present in that system.

4 pages, 3 figures; published in Physical Review Letters

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Cited by in corpus (47)

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• The pseudogap: friend or foe of high Tc?
• From Fermi Arcs to the Nodal Metal: Scaling of the Pseudogap with Doping and Temperature
• Phase competition in trisected superconducting dome
• The Ground State of the Pseudogap in Cuprate Superconductors
• Theory of quantum metal to superconductor transitions in highly conducting systems
• The a-axis optical conductivity of detwinned ortho-II YBa_2Cu_3O_6.50
• Low-temperature phonon thermal conductivity of cuprate single crystals
• Superconductivity in nickel based 112 systems
• Evolution from a nodeless gap to d(x2-y2) form in underdoped La(2-x)SrxCuO4
• Central mode and spin confinement near the boundary of the superconducting phase in YBa2Cu3O6.353 (Tc=18 K)
• Effective theory of high-temperature superconductors
• Spin dynamics near the critical doping in weakly-superconducting underdoped YBa2Cu3O6.35 (Tc=18K)
• Truncated Schwinger-Dyson Equations and Gauge Covariance in QED3
• 4D-XY quantum criticality in a doped Mott insulator
• Doping dependence of the superconducting gap in Tl_2Ba_2CuO_{6+delta} from heat transport
• Onset of a boson mode at superconducting critical point of underdoped YBa2Cu3Oy
• Low energy physical properties of high-Tc superconducting Cu oxides: A comparison between the resonating valence bond and experiments
• Heat transport in Bi_{2+x}Sr_{2-x}CuO_{6+δ}: departure from the Wiedemann-Franz law in the vicinity of the metal-insulator transition
• Quantitative Raman measurements of the evolution of the Cooper-pairs density with doping in Bi2Sr2CaCu2O8+d superconductors
• The One-Particle Spectral Function and the Local Density of States in a Phenomenological Mixed-Phase Model for High-Temperature Superconductors
• Optical determination of the superconducting energy gap in electron-doped Pr_{1.85}Ce_{0.15}CuO_4
• Breakdown of universal transport in correlated d-wave superconductors
• Low-temperature nodal-quasiparticle transport in lightly doped YBa_{2}Cu_{3}O_{y} near the edge of the superconducting doping regime
• Fermiology of Cuprates from First Principles: From Small Pockets to the Luttinger Fermi surface
• Massive Dirac fermions and the zero field quantum Hall effect
• Evidence for decay of spin-waves above the pseudogap in underdoped YBa2Cu3O6.35
• Thermoelectric transport near pair breaking quantum phase transition out of d-wave superconductivity
• Gauge Covariance Relations and the Fermion Propagator in Maxwell-Chern-Simons QED3
• Temperature dependent Fermi arcs in the normal state of the underdoped cuprate superconductors
• Chiral and Parity Symmetry Breaking for Planar Fermions: Effects of a Heat Bath and Uniform External Magnetic Field
• d-wave to s-wave to normal metal transitions in disordered superconductors
• ARPES Spectral Function in Lightly Doped and Antiferromagnetically Ordered YBa2Cu3O{6+y}
• Effects of impurities and vortices on the low-energy spin excitations in high-Tc materials
• Two energy scales and close relationship between the pseudogap and superconductivity in underdoped cuprate superconductors
• Magnetic properties of lightly doped antiferromagnetic YBa${}_2$Cu${}_3$O${}_y$
• Duality and the vibrational modes of a Cooper-pair Wigner crystal
• Low temperature quasiparticle transport in a d-wave superconductor with coexisting charge order
• High-field muSR studies of superconducting and magnetic correlations in cuprates above Tc
• Renormalization of thermal conductivity of disordered d-wave superconductors by impurity-induced local moments
• Low temperature thermal transport at the interface of a topological insulator and a d-wave superconductor
• Quantum phase transitions in magnetism and superconductivity: emergent spin topology seen with neutrons
• Comment on "Onset of Boson Mode at the Superconducting Critical Point of Underdoped YBa2Cu3Oy"
• Effect of coexisting order of various form and wave vector on low-temperature thermal conductivity in d-wave superconductors
• Low temperature thermal conductivity in a d-wave superconductor with coexisting charge order: Effect of self-consistent disorder and vertex corrections
• Pitfalls in the analysis of low-temperature thermal conductivity of high-Tc cuprates