Pseudogap in electron-doped cuprates: Strong correlation leading to band splitting

Abstract

The pseudogap phenomena have been a long-standing mystery of the cuprate high-temperature superconductors. The pseudogap in the electron-doped cuprates has been attributed to band folding due to antiferromagnetic (AFM) long-range order or short-range correlation. We performed an angle-resolved photoemission spectroscopy (ARPES) study of the electron-doped cuprates Pr${}_{1.3-x}$La${}_{0.7}$Ce${}_x$CuO${}_4$ showing spin-glass, disordered AFM behaviors, and superconductivity at low temperatures and, by measurements with fine momentum cuts, found that the gap opens on the unfolded Fermi surface rather than the AFM Brillouin zone boundary. The gap did not show a node, following the full symmetry of the Brillouin zone, and its magnitude decreased from the zone-diagonal to ($\pi$,0) directions, opposite to the hole-doped case. These observations were reproduced by cluster dynamical-mean-field-theory (CDMFT) calculation, which took into account electron correlation precisely within a (CuO${}_2$)${}_4$ cluster. The present experimental and theoretical results are consistent with the mechanism that electron or hole doping into a Mott insulator creates an in-gap band that are separated from the upper or lower Hubbard band by the pseudogap.

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Cited by in corpus (7)

• Fermi surface reconstruction in electron-doped cuprates without antiferromagnetic long-range order
• Surprises in the t-J model: Implications for cuprates
• Enhanced superconducting gap in the outer CuO${}_2$ plane of the trilayer cuprate (Hg,Re)Ba${}_2$Ca${}_2$Cu${}_3$O${}_{8+\delta }$
• Vanishing pseudogap around $(\pi ,0)$ in an electron-doped high-${\mathrm{T}}_{\mathrm{c}}$ superconductor: a simple picture
• Inhomogeneous reduction-annealing effects on the electron-doped cuprate superconductor revealed by micro-focused angle-resolved photoemission spectroscopy
• Mott Criticality as the Confinement Transition of a Pseudogap-Mott Metal
• Probing the pseudogap and beyond: Examining single-particle properties of the hole- and electron-doped Hubbard model