Ce-substitution effects on the spin excitation spectra in Pr1.4-xLa0.6CexCuO4+δ

International Conference on Strongly Correlated Electron Systems 2016

Asano, S.^1 ; Tsutsumi, K.^1 ; Sato, K.^1 ; Fujita, M.^2

Department of Physics, Tohoku University, Sendai, Japan^1

Institute for Materials Research, Tohoku University, Sendai, Japan^2

关键词: Ce substitutions;    Double peak structure;    High energy regions;    Inelastic neutrons;    Low energy regions;    Magnetic intensities;    Magnetic signals;    Spinwave excitation;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/807/5/052009/pdf
DOI  :  10.1088/1742-6596/807/5/052009

来源: IOP

【 摘 要 】

We performed inelastic neutron scattering measurements on as-grown single crystals of electron-doped Pr1.4-xLa0.6CexCuO4+δwith x = 0, 0.08 and 0.18. We succeeded in observing the spin excitation spectra up to 300meV in the all samples. In both parent and electron-doped samples, a magnetic signal was observed at the magnetic zone center (0.5, 0.5) in the low-energy region below 40 meV. In the high-energy region above 100 meV, a double-peak structure reflecting the spin-wave excitation was detected in the constant-energy spectrum for the parent sample, while a single broad peak centered at (0.5, 0.5) was observed for the Ce-doped samples. These results suggest that the dispersion of spin excitation spectra become steeper upon doping. Furthermore, we newly found a drastic reduction of the magnetic intensity with Ce-substitution.