Point nodes persisting far beyond Tc in Bi2212

Abstract

In contrast to a complex feature of antinodal state, suffering from competing order(s), the "pure" pairing gap of cuprates is obtained in the nodal region, which therefore holds the key to the superconducting mechanism. One of the biggest question is whether the point nodal state as a hallmark of d-wave pairing collapses at Tc like the BCS-type superconductors, or it instead survives above Tc turning into the preformed pair state. A difficulty in this issue comes from the small magnitude of the nodal gap, which has been preventing experimentalists from solving it. Here we use a laser ARPES capable of ultrahigh energy resolution, and detect the point nodes surviving far beyond Tc in Bi2212. By tracking the temperature evolution of spectra, we reveal that the superconductivity occurs when the pair breaking rate is suppressed smaller than the single particle scattering rate on cooling, which governs the value of Tc in cuprates.

References in corpus (19)

• Direct observation of competition between superconductivity and charge density wave order in YBa2Cu3Oy
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• Time-resolved ARPES on cuprates: Tracking the low-energy electrodynamics in the time domain
• Fermi arcs and pseudogap phase in a minimal microscopic model of $d$-wave superconductivity
• Density Waves Cause Sub-Gap Structures but no Pseudogap in Superconducting Cuprates
• Consistent two-lifetime model for spectral functions of superconductors
• Investigation of Precursor Superconducting State in YBa${}_2$Cu${}_3$O${}_{7-\delta }$ through In-plane Optical Spectroscopy
• Incoherent superconductivity well above $T_c$ in high-$T_c$ cuprates - harmonizing the spectroscopic and thermodynamic data
• Field-dependent specific heat of the canonical underdoped cuprate superconductor YBa${}_2$Cu${}_4$O${}_8$
• Phase transitions to dipolar clusters and charge density waves in high Tc superconductors
• Coupled electronic and magnetic excitations in the cuprates and their role in the superconducting transition
• A sample-position-autocorrection system with precision better than 1 \um~in angle-resolved photoemission experiments
• Empirical case for two pseudogaps in cuprate superconductors