Quantum critical point in SmO_1−xF_xFeAs and oxygen vacancy induced by high fluorine dopant

The local lattice and electronic structure of the high-T_c superconductor SmO_1–xF_xFeAs as a function of F-doping have been investigated by Sm L₃-edge X-ray absorption near-edge structure and multiple-scattering calculations.

The measurement of differential EXAFS modulated by high pressure

Differential EXAFS (DiffEXAFS) is able to detect subtle atomic perturbations in the local area of the absorbing atom. Here a new method of performing DiffEXAFS experiments under the modulation of high pressure has been developed.