Three energy scales characterizing the competing pseudogap state, the incoherent, and the coherent superconducting state in high-Tc cuprates

Abstract

We have studied the momentum dependence of the energy gap of Bi2(Sr,R)2CuOy by angleresolved photoemission spectroscopy (ARPES), particularly focusing on the difference between R=La and Eu. By comparing the gap function and characteristic temperatures between the two sets of samples, we show that there exist three distinct energy scales, Δpg, Δsc0, and Δeff sc0, which correspond to T* (pseudogap temperature), Tonset (onset temperature of fluctuating superconductivity), and Tc (critical temperature of coherent superconductivity). The results not only support the existence of a pseudogap state below T* that competes with superconductivity but also the duality of competition and superconducting fluctuation at momenta around the antinode below Tonset.

accepted in Phys. Rev. B

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Cited by in corpus (8)

• Energy gaps in high-transition temperature cuprate superconductors
• Disparity of superconducting and pseudogap scales in low-Tc Bi-2201 cuprates
• Equivalent dynamical complexity in a many-body quantum and collective human system
• Superconductivity distorted by the coexisting pseudogap in the antinodal region of Bi${}_{1.5}$Pb${}_{0.55}$Sr${}_{1.6}$La${}_{0.4}$CuO${}_{6+\delta }$: A photon-energy-dependent angle-resolved photoemission study
• Quantum mechanical picture of the coupling between interlayer electronic excitations and infrared active phonons in bilayer cuprate superconductors
• Ni-impurity effects on the superconducting gap of La${}_{2-x}$Sr${}_x$CuO${}_4$ studied from the magnetic field and temperature dependence of the electronic specific heat
• The k-space Origins of Scattering in Bi2Sr2CaCu2O8+x
• Possible Spatial Correlation of Superconducting and Pseudogap Dynamics in a Bi-based Cuprate