Inelastic neutron scattering study of phonon anomalies in LaSrNiO

梶本 亮一; 藤田 全基*; 中島 健次; 池内 和彦*; 稲村 泰弘; 中村 充孝; 今里 拓朗*

Journal of Physics; Conference Series, 502(1), p.012056_1 - 012056_5, 2014/04

https://doi.org/10.1088/1742-6596/502/1/012056

We studied spin and lattice dynamics in this highly hole-doped region of SrNiO to investigate how they are modified compared with the lower hole-concentration region. We performed inelastic neutron scattering experiments on LaSrNiO and PrSrNiO on the chopper-type neutron spectrometer 4SEASONS at J-PARC. We observed magnetic excitations below 60 meV for both compounds, which are consistent with a previous study on LaSrNiO. Furthermore, we observed softening of a phonon mode, which is similar to the one observed in a nickelate with a much lower hole concentration, LaSrNiO. We will show the details of data and discussions on the roles of holes in the presentation.