Hierarchy of multiple many-body interaction scales in high-temperature superconductors

Abstract

To date, angle-resolved photoemission spectroscopy has been successful in identifying energy scales of the many-body interactions in correlated materials, focused on binding energies of up to a few hundred meV below the Fermi energy. Here, at higher energy scale, we present improved experimental data from four families of high-Tc superconductors over a wide doping range that reveal a hierarchy of many-body interaction scales focused on: the low energy anomaly ("kink") of 0.03-0.09eV, a high energy anomaly of 0.3-0.5eV, and an anomalous enhancement of the width of the LDA-based CuO2 band extending to energies of ≈ 2 eV. Besides their universal behavior over the families, we find that all of these three dispersion anomalies also show clear doping dependence over the doping range presented.

Charge Order Driven by Fermi-Arc Instability in Bi 2 Sr 2− x La x CuO 6+δ

“…This apparent band of incoherent excitations along the nodal direction (shown in more detail in Fig. S7E), often termed the 'waterfall', in our model bottoms down around 1-1.3 eV, in good agreement with experimental data on different compounds [2,38]. Fig.…”

Effects of charge inhomogeneities on elementary excitations inLa2−xSrxCuO4

“…Our simulation, which only includes doping inhomogeneity, cannot reproduce the entire ARPES spectrum, especially in the anti-nodal region, because of the pseudogap and the incoherent spectrum at higher binding energies. 41 However, we can conclude that the long-standing observation of broader peaks near antinodes in LSCO is due, in large part, to inhomogeneous doping. We find further evidence for the mechanism proposed here from another cuprate superconductor.…”

High-energy anomaly in Nd2−xCexCuOSchmitt1, Moritz2, Johnston3 et al. 2011Phys. Rev. BSelf Cite9560View full textAdd to dashboardCite

“…[8][9][10][11]14,[24][25][26][27][28][29] However, the vertical drop-off at higher energies, and apparent "back-bending" in some data, calls into question this large bandwidth, quasiparticle scenario and the justification for LDA fits or even Lorentzian momentum distribution curve (MDC) fits in the energy window below the HEA energy scale, also highlighted by the results from laser-based ARPES.…”

“…[5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] ARPES reveals dispersing quasiparticles with sharp spectral features close to E F that give way to an almost vertical dispersion around ∼ 0.3 eV for the hole(h)-doped HTSCs [6][7][8][9][10][11][12][13][14]16,18 , and ∼ 0.5 eV for the electron(e)-doped HTSCs. 6,15,[17][18][19] This vertical dispersion or "waterfall" eventually merges with the incoherent valence bands at higher binding-energies.…”

“…[6][7][8][9][10][11][12][13][14]16,18 In some of these early studies, the HEA was tied to a presumed underlying dispersion through a sizable renormalization in the quasiparticle bare band.…”