Unified theory of spin and charge excitations in high-Tc cuprate superconductors: A quantitative comparison with experiment and interpretation
Maciej Fidrysiak, Józef Spałek
DOI 10.1103/PhysRevB.104.L020510 · Physical Review B
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Abstract
We provide a unified interpretation of both paramagnon and plasmon modes in high-Tc copper-oxides, and verify it quantitatively against available resonant inelastic x-ray scattering (RIXS) data across the hole-doped phase diagram. The three-dimensional extended Hubbard model, with included long-range Coulomb interactions and doping-independent microscopic parameters for both classes of quantum fluctuations, is used. Collective modes are studied using VWF+1/Nf approach which extends variational wave function (VWF) scheme by means of an expansion in inverse number of fermionic flavors (1/Nf). We show that intense paramagnons persist along the antinodal line from the underdoped to the overdoped regime and undergo rapid overdamping in the nodal direction. Plasmons exhibit a three-dimensional character, with minimal energy corresponding to antiphase oscillations on neighboring CuO2 planes. The theoretical spin- and charge excitation energies reproduce semiquantitatively RIXS data for (Bi,Pb)2(Sr,La)2CuO6+δ. The present VWF+1/Nf analysis of dynamics and former VWF results for static quantities combine into a consistent description of the principal properties of hole-doped high-Tc cuprates as strongly correlated systems.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (Bi,Pb)2(Sr,La)2CuO6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Bi2Sr1.6La0.4CuO6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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