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From a Single-Band Metal to a High-Temperature Superconductor via Two Thermal Phase Transitions
Upon further cooling, spectroscopic signatures of superconductivity begin to grow close to the superconducting transition temperature (Tc), entangled in an energy-momentum–dependent manner with the preexisting pseudogap features, ushering in a ground state with coexisting orders. Expand
Phase competition in trisected superconducting dome
This work presents a comprehensive doping- and temperature-dependence ARPES study of spectral gaps in Bi2Sr2CaCu2O8+δ, covering much of the superconducting portion of the phase diagram and implies a revised phase diagram that reconciles conflicting reports about the endpoint of the pseudogap in the literature. Expand
Interplay of electron–lattice interactions and superconductivity in Bi2Sr2CaCu2O8+δ
Formation of electron pairs is essential to superconductivity. For conventional superconductors, tunnelling spectroscopy has established that pairing is mediated by bosonic modes (phonons); a peak inExpand
Relation between the nodal and antinodal gap and critical temperature in superconducting Bi2212
It is shown that a nodal-gap energy 2ΔN closely follows 8.5 kBTc with underdoping and is also proportional to the product of an antinodal gap energy Δ* and a square-root superfluid density √Ps for Bi2Sr2CaCu2O8+δ, using low-energy synchrotron-radiation angle-resolved photoemission. Expand
Three-Dimensional Fermi Surface of Overdoped La-Based Cuprates.
It is suggested that quantum criticality induced by a collapsing pseudogap phase as a plausible explanation for observed enhancement of electronic specific heat cannot be assigned to the van Hove singularity alone. Expand
Revealing the Dual Nature of Magnetism in Iron Pnictides and Iron Chalcogenides Using X-ray Emission Spectroscopy
We report a Fe K beta x-ray emission spectroscopy study of local magnetic moments in various iron-based superconductors in their paramagnetic phases. Local magnetic moments are found in all samplesExpand
Degradation of Superconductivity and Spin Fluctuations by Electron Overdoping in LaFeAsO1-xFx
Low-energy spin fluctuations are studied for the electron-doped Fe-based superconductor LaFeAsO 1- x F x by inelastic neutron scattering up to an energy transfer of ω= 15 meV using polycrystallineExpand
Two-Dimensional Spin Density Wave State in LaFeAsO
The parent compound of the Fe oxypnictide superconductor, LaFeAsO, has been studied by pulsed neutron powder inelastic scattering measurement. The inelastic scattering intensity along the Q -axis atExpand
Coexisting spin resonance and long-range magnetic order of Eu in EuRbFe 4 As 4
Magnetic excitations and magnetic structure of EuRbFe$_4$As$_4$ were investigated by inelastic neutron scattering (INS), neutron diffraction, and random phase approximation (RPA) calculations. BelowExpand
Direct spectroscopic evidence for phase competition between the pseudogap and superconductivity in Bi2Sr2CaCu2O(8+δ).
An antagonistic singularity at T(c) in the spectral weight of Bi2Sr2CaCu2O(8+δ) is reported as compelling evidence for phase competition, and comparison with theoretical calculations confirms that the singularity is a signature of competition between the order parameters for the pseudogap and superconductivity. Expand