An Overall Energy Spectrum of Magnetic Fluctuations in the Superconducting La_<1.85>Sr_<0.15>CuO_4

概要

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High-energy pulsed neutron inelastic scattering experiments have been performed using single crystals of La_<1.85>Sr_<0.15>CuO_4 to study magnetic fluctuations in the superconducting phase. A peak centered at the reciprocal point (π, π) is well defined below around 120 meV and rapidly damped beyond this energy. However, the "background-subtracted" scattering intensities indicate that magnetic signals remain up to around 300 meV. These data combined with the results obtained by triple-axis neutron scattering experiments provide the first overall energy spectrum of the dynamical susceptibility in La_<1.85>Sr_<0.15>CuO_4. The obtained spectrum is much wider than that of YBa_2Cu_3O_<7-d> (d〜0).
社団法人日本物理学会の論文
1995-08-15