Speaker
Aleksandr Chumakov
(European Synchrotron Radiation Facility)
Description
For visible light, the concept of spectrographic imaging — dispersion of
radiation components with various energies in space — has been known since
Newton’s time. In this presentation, we report on a hard (14 keV) x-ray
spectrograph implemented at the European synchrotron, enabling an
observation of anomalous soft modes in alpha-iron [1]. We present new
unpublished data on temperature evolution these modes, suggesting an
anharmonic nature of the phenomenon, possibly with an additional relation
to magnetism.
- A. I. Chumakov, Y. Shvyd’ko, I. Sergueev, D. Bessas, and R. Rüffer,
Phys. Rev. Lett. 123, 097402 (2019).
