Studies on Magnetic Excitation Spectra of High-Tc Superconductors

Abstract

Magnetic excitation spectra c"(q,w) of YBa2Cu3Oy, La2-xSrxCuO4, La2-y-xNdySrxCuO4 and Nd2-xCexCuO4 are compared with those of model calculations, where q and w are the wave vector and the energy of the excitations. In the model, the dynamical spin susceptibility is calculated by the expression c(q,w)= c0(q,w)/{1+J(q)c0(q,w)}, where c0(q,w) is obtained by adopting the effective energy dispersion of the quasi particles which can reproduce the shapes of the Fermi surface, and J(q) is the exchange coupling between the Cu-Cu electrons. It is important to consider the experimentally observed quasi particle broadening (G) to reproduce the observed spectra of YBa2Cu3Oy, while to reproduce the data of La2-xSrxCuO4 and La2-y-xNdySrxCuO4, very small G values have to be used, even in the phases without the static "stripe" order. This may be caused by the existence of the "stripe" correlations or "stripe" fluctuations.

arXiv comment16 pages, 12 figures, J. Phys. Soc. Jpn. submitted

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Cited by in corpus (4)

• Doping dependence of spin excitations in the stripe phase of high-Tc superconductors
• Zn and Ni doping effects on the low-energy spin excitations in La${}_{1.85}$Sr${}_{0.15}$CuO${}_4$
• Influence of higher d-wave gap harmonics on the dynamical magnetic susceptibility of high-temperature superconductors
• On the Magnetic Excitation Spectra of High Tc Cu Oxides up to the Energies far above the Resonance Energy