Electron momentum density of boron-doped carbon nano-onions studied by electron energy-loss spectroscopy

Valence Compton profiles (CPs) (electron momentum density projections) of B-doped carbon nano-onions (CNOs) as a function of the boron doping content were obtained by recording electron energy-loss spectra at large...

Electron momentum density of hexagonal Zn studied by high-resolution Compton scattering

High-resolution (0.12 a.u.) electron momentum density projections (Compton profiles) of a hexagonal Zn single crystal have been measured along five high-symmetry directions in reciprocal space. The experiment was performed with the use of 115.6 keV synchrotron radiation on the BL08W station at SPring-8. The quality of the measured Compton profiles is significantly better than that of previous medium- and high-resolution data. The experimental data were compared with the corresponding theoretical Korringa–Kohn–Rostoker (KKR) and density functional theory (DFT) calculations. Some minor and major differences between the two theoretical band-structure calculations have been observed. However, the good quality experimental results indicate their better agreement with DFT.

Isotropic distributions in hcp crystals

Some anisotropic quantities in crystalline solids can be determined from their knowledge along a limited number of sampling directions. The importance of the choice of such directions is illustrated on the example of estimating, from angular correlation of annihilation radiation data, the isotropic electron momentum density in Gd.

Electron Momentum Density: Recent Progress and Perspective for Combined Studies

Quantum mechanical descriptions are becoming a focus of attention in understanding the behavior of wide classes of materials. This paper discusses some of our recent works related to charge or magnetic Compton scattering studies. Selected topics include: (1) Quantum modelling of doped holes in high-Tc cuprates [1], which provides insight into the dome-shaped doping dependence of the superconducting transition temperature. (2) Analyses of Compton scattering X-ray spectra in spin-crossover cobaltates, which allows us to delineate the t2g-eg physics and quantum chemistry from the temperature evolution of electron momentum density. As a conclusion remark, we show an example of combined studies [2] and present its perspective, emphasizing that X-ray Compton scattering is highly sensitive to delocalized or itinerant electrons.