Measurement of x-ray absorption spectra of overdoped high-temperature cuprate superconductors: Inapplicability of the single-band Hubbard model

Abstract

X-ray absorption spectra on the overdoped high-temperature superconductors Tl_2Ba_2CuO_{6+delta} (Tl-2201) and La_{2-x}Sr_xCuO_{4+delta} (LSCO) reveal a striking departure in the electronic structure from that of the underdoped regime. The upper Hubbard band, identified with strong correlation effects, is not observed on the oxygen K edge, while the lowest-energy prepeak gains less intensity than expected above p ~ 0.21. This suggests a breakdown of the Zhang-Rice singlet approximation and a loss of correlation effects or a significant shift in the most fundamental parameters of the system, rendering single-band Hubbard models inapplicable. Such fundamental changes suggest that the overdoped regime may offer a distinct route to understanding in the cuprates.

4 pages, 2 figures

References in corpus (9)

• Quantum oscillations and the Fermi surface in an underdoped high-Tc superconductor
• Electron pockets in the Fermi surface of hole-doped high-Tc superconductors
• Shubnikov-de Haas oscillations in YBa_2Cu_4O_8
• The ground state of heavily-overdoped non-superconducting La${}_{2-x}$Sr${}_x$CuO${}_4$
• de Haas-van Alphen oscillations in the underdoped cuprate YBa${}_2$Cu${}_3$O${}_{6.5}$
• Strong charge fluctuations manifested in the high-temperature Hall coefficient of high-T_c cuprates
• Physics of cuprates with the two-band Hubbard model - The validity of the one-band Hubbard model
• Tl2Ba2CuO6+d Brings Spectroscopic Probes Deep Into the Overdoped Regime of the High-Tc Cuprates
• Evolution of the density of states at EF of Bi2-yPbySr2-xLaxCuO6+d and Bi2Sr2-xLaxCuO6+d cuprates with hole doping

Cited by in corpus (16)

• Resonant Elastic Soft X-Ray Scattering
• Accurate X-Ray Absorption Predictions for Transition Metal Oxides: An Advanced Self-Consistent-Field Approach Inspired by Many-Body Perturbation Theory
• Intermediate Coupling Model of the Cuprates
• $Ab$ $initio$ low-energy effective Hamiltonians for high-temperature superconducting cuprates Bi${}_2$Sr${}_2$CuO${}_6$, Bi${}_2$Sr${}_2$CaCu${}_2$O${}_8$, HgBa${}_2$CuO${}_4$ and CaCuO${}_2$
• Strongly-overdoped La${}_{2-x}$Sr${}_x$CuO${}_4$: Evidence for Josephson-coupled grains of strongly-correlated superconductor
• Failure of t-J models in describing doping evolution of spectral weight in x-ray scattering, optical and photoemission spectra of the cuprates
• Fermion condensation, $T$-linear resistivity and Planckian limit
• Local Entropies across the Mott Transition in an Exactly Solvable Model
• Microscopic theory of resonant soft x-ray scattering in systems with charge order
• Electronic structure and two-band superconductivity in unconventional high-$T_c$ cuprates Ba${}_2$CuO${}_{3+\delta }$
• Bulk Fermi surface and momentum density in heavily doped La${}_{2-x}$Sr${}_x$CuO${}_4$ using high resolution Compton scattering and positron annihilation spectroscopies
• Superconductor to Mott insulator transition in YBa${}_2$Cu${}_3$O${}_7$/LaCaMnO${}_3$ heterostructures
• Absence of Luther-Emery Superconducting Phase in the Three-Band Model for Cuprate Ladders
• Unusual Hole-doping-dependent Electronic Instability and Electron-Phonon Coupling in Infinite-layer Nickelates
• Oxygen hole content, charge-transfer gap, covalency, and cuprate superconductivity
• Superconductivity Reinforces Charge-Density-Wave Phase Coherence across Cuprates