Implications of Resonant Inelastic X-ray Scattering Data for Theoretical Models of Cuprates

Abstract

There are two commonly discussed points of view in theoretical description of cuprate superconductors, (i) Cuprates can be described by the modified t-J model. (ii) Overdoped cuprates are close to the regime of normal Fermi liquid (NFL). We argue that recent resonant inelastic X-ray scattering data challenge both points. While the modified t-J model describes well the strongly underdoped regime, it fails to describe high energy magnetic excitations when approaching optimal doping. This probably indicates failure of the Zhang-Rice singlet picture. In the overdoped regime the momentum-integrated spin structure factor S(ω) has the same intensity and energy distribution as that in an undoped parent compound. This implies that the entire spin spectral sum rule is saturated at ω~ 2J, while in a NFL the spectral weight should saturate only at the total bandwidth which is much larger than 2J.

10 pages, 9 figures

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Cited by in corpus (11)

• Insights into the High Temperature Superconducting Cuprates from Resonant Inelastic X-ray Scattering
• A resonant inelastic x-ray scattering study of the spin and charge excitations in the overdoped superconductor La1.77Sr0.23CuO4
• Orbital structure of the effective pairing interaction in the high-temperature superconducting cuprates
• Evolution of plasmon excitations across the phase diagram of the cuprate superconductor La${}_{2-x}$Sr${}_x$CuO${}_4$
• Numerically exploring the 1D-2D dimensional crossover on spin dynamics in the doped Hubbard model
• Enhanced charge excitations in electron-doped cuprates by resonant inelastic x-ray scattering
• Signatures of strong correlation effects in RIXS on Cuprates
• Torque equilibrium spin wave theory study of anisotropy and Dzyaloshinskii-Moriya interaction effects on the indirect K$-$ edge RIXS spectrum of a triangular lattice antiferromagnet
• Nature of the spin liquid in underdoped cuprate superconductors
• Bond particle theory for the pseudogap phase of underdoped cuprates
• Effect of broken symmetry on resonant inelastic x-ray scattering from undoped cuprates