IN5
Disk chopper time-of-flight spectrometer
![The reduced vibrational density of states [g(E)/E2] of PIB at different pressuresGreen: atmospheric pressure. Light blue, deep blue, red: 0.4, 0.8 and 1.4 GPa. Insert: typical clamps used for the experiment.](/fileadmin/_processed_/c/6/csm_in5b-example1_ec562c742c.jpg)
The reduced vibrational density of states [g(E)/E2] of PIB at different pressuresGreen: atmospheric pressure. Light blue, deep blue, red: 0.4, 0.8 and 1.4 GPa. Insert: typical clamps used for the experiment.
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).