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- W2102394848 abstract "The high-Tc cuprate superconductors are close to antiferromagnetic order. Recent measurements of magnetic excitations have reported an intriguing similarity to the spin waves—magnons—of the antiferromagnetic insulating parent compounds, suggesting that magnons may survive in damped, broadened form throughout the phase diagram. Here we show by resonant inelastic X-ray scattering on Bi2Sr2CaCu2O8+δ (Bi-2212) that the analogy with spin waves is only partial. The magnon-like features collapse along the nodal direction in momentum space and exhibit a photon energy dependence markedly different from the Mott-insulating case. These observations can be naturally described by the continuum of charge and spin excitations of correlated electrons. The persistence of damped magnons could favour scenarios for superconductivity built from quasiparticles coupled to spin fluctuations. However, excitation spectra composed of particle–hole excitations suggest that superconductivity emerges from a coherent treatment of electronic spin and charge in the form of quasiparticles with very strong magnetic correlations. The nature of the relationship between the spin-ordered and superconducting states of the cuprates is a longstanding puzzle. X-ray measurements conducted by Guarise et al. suggest that a continuum model rather than overdamped magnon model provides a more complete picture of the spin spectrum of Bi2Sr2CaCu2O8+δ." @default.
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- W2102394848 date "2014-12-18" @default.
- W2102394848 modified "2023-10-03" @default.
- W2102394848 title "Anisotropic softening of magnetic excitations along the nodal direction in superconducting cuprates" @default.
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- W2102394848 doi "https://doi.org/10.1038/ncomms6760" @default.
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