Disk chopper time-of-flight spectrometer

A polymer under pressure

The experiment was performed on the upgraded IN5 multi-chopper spectrometer using a dilution fridge (T = 45mK) and a cryomagnet with magnetic fields up to 1 Tesla. It allowed us to completely elucidate the mechanism leading to this zero-field split ground state.

Ref.: Influence of pressure on the Boson Peak: Stronger than elastic medium transformation,
Niss K., Begen B., Frick B., Ollivier J., Beraud A., Sokolov A., Novikov V.N., Alba-Simionesco C., Phys. Rev. Letters 99, 055502-1-055502-4 (2007).