Pseudogap Suppression by Competition with Superconductivity in La-Based Cuprates

Abstract

We have carried out a comprehensive high-resolution angle-resolved photoemission spectroscopy (ARPES) study of the pseudogap interplay with superconductivity in La-based cuprates. The three systems La${}_{2-x}$Sr${}_x$CuO${}_4$, La${}_{1.6-x}$Nd${}_{0.4}$Sr${}_x$CuO${}_4$, and La${}_{1.8-x}$Eu${}_{0.2}$Sr${}_x$CuO${}_4$ display slightly different pseudogap critical points in the temperature versus doping phase diagram. We have studied the pseudogap evolution into the superconducting state for doping concentrations just below the critical point. In this setting, near optimal doping for superconductivity and in the presence of the weakest possible pseudogap, we uncover how the pseudogap is partially suppressed inside the superconducting state. This conclusion is based on the direct observation of a reduced pseudogap energy scale and re-emergence of spectral weight suppressed by the pseudogap. Altogether these observations suggest that the pseudogap phenomenon in La-based cuprates is in competition with superconductivity for anti-nodal spectral weight.

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Cited by in corpus (4)

• Strongly-overdoped La${}_{2-x}$Sr${}_x$CuO${}_4$: Evidence for Josephson-coupled grains of strongly-correlated superconductor
• Spin-stripe order tied to the pseudogap phase in La1.8-xEu0.2SrxCuO4
• Retaining Landau quasiparticles in the presence of realistic charge fluctuations in cuprates
• Beyond on-site Hubbard interaction in charge dynamics of cuprate superconductors