Spin Crossover of Colbates Revealed by Resonant Inelastic X-ray Scattering
Di-Jing Huang1*
1Research Div., NSRRC, Hsinchu, Taiwan
* presenting author:Di-Jing Huang, email:djhuang@nsrrc.org.tw
Spin-state transitions or crossovers between low-spin and high-spin states occur in diverse materials. While the preferred model of thermal evolution is based on changes in the crystal-field excitations of transition-metal ions, the associated changes in Coulomb energies across spin-state transitions are not known from experiment. Here we demonstrate that resonant inelastic X-ray scattering (RIXS) effectively characterizes the evolutions of the high and low spin states in LaCoO3, respectively, when the temperature is changed across the spin crossover temperature. Markedly the results indicate that one can use a high-energy (~1.3 eV) excitation method to unravel a spin-state transition which is triggered by a temperature change equivalent to an energy change less than 10 meV. The RIXS approach establishes a new window to understanding the spin sate
transition of transition metal compounds, particularly those containing transition metal ions with a 3d6 electronic configuration.

Keywords: RIXS