Thermal neutron three-axis spectrometer with polarization analysis IN20

Phonon-magnon coupling in CMR manganates

Despite large differences in their Curie temperatures, different ferromagnetic manganese perovskites exhibit very similar dispersions with marked zone-boundary magnon softening and broadening due to a strong coupling to optical phonons.

Polarisation analysis provides an ultimate tool to separate unequivocally the magnetic part from the rest of the neutron response.

The data displayed in the figure were collected with a 2 cm3 single crystal of La0.7Ca0.3MnO3 using the 4T horizontal cryomagnet and a "half-polarised" setup (Heusler 111 monochromator and PG 002 analyzer).