Phase competition in trisected superconducting dome

Abstract

A detailed phenomenology of low energy excitations is a crucial starting point for microscopic understanding of complex materials such as the cuprate high temperature superconductors. Because of its unique momentum-space discrimination, angle-resolved photoemission spectroscopy (ARPES) is ideally suited for this task in the cuprates where emergent phases, particularly superconductivity and the pseudogap, have anisotropic gap structure in momentum space. We present a comprehensive doping-and-temperature dependence ARPES study of spectral gaps in Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ (Bi-2212), covering much of the superconducting portion of the phase diagram. In the ground state, abrupt changes in near-nodal gap phenomenology give spectroscopic evidence for two potential quantum critical points, p$=$0.19 for the pseudogap phase and p$=$0.076 for another competing phase. Temperature dependence reveals that the pseudogap is not static below T${}_c$ and exists p$>$0.19 at higher temperatures. Our data imply a revised phase diagram which reconciles conflicting reports about the endpoint of the pseudogap in the literature, incorporates phase competition between the superconducting gap and pseudogap, and highlights distinct physics at the edge of the superconducting dome.

to appear in PNAS

References in corpus (20)

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• From a single-band metal to a high-temperature superconductor via two thermal phase transitions (Supporting Material)
• Direct evidence for a competition between the pseudogap and high temperature superconductivity in the cuprates
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Cited by in corpus (8)

• Energy gaps in high-transition temperature cuprate superconductors
• Point nodes persisting far beyond Tc in Bi2212
• Evolution from a nodeless gap to d(x2-y2) form in underdoped La(2-x)SrxCuO4
• Intermediate Coupling Model of the Cuprates
• Higgs criticality in a two-dimensional metal
• High Temperature Superconductivity in the Cuprates
• Exploring intertwined orders in cuprate superconductors
• Signatures of a momentum independent pseudogap in the electronic density of states and Raman spectroscopy of the underdoped cuprates