From one- to two-magnon excitations in the S=3/2 magnet $\beta$-CaCr${}_2$O${}_4$

M. Songvilay, S. Petit, F. Damay +7

We apply neutron spectroscopy to measure the magnetic dynamics in the S=3/2 magnet $\beta$-CaCr${}_2$O${}_4$ (T${}_N$=21 K). The low-energy fluctuations, in the ordered state, resemble large…