Magnetic ordering in double perovskites R2CoMnO6 (R= Y,Tb) investigated by high resolution neutron spectroscopy
Abstract
We have investigated low energy nuclear spin excitations in double perovskite compounds R2CoMnO6 (R = Y,Tb) by inelastic neutron scattering with a high-resolution back-scattering spectrometer. We observed inelastic signals at about 2.1 μeV for Y2CoMnO6 and also for Tb2CoMnO6 at T = 2 K in both energy loss and energy gain sides. We interpret these inelastic peaks to be due to the transitions between the hyperfine split nuclear levels of 59Co nucleus. The inelastic peaks move towards the central elastic peak and finally merge with it at the magnetic ordering temperature TC. The energy of the low energy excitations decreases continuously and becomes zero at TC ≈ 75 K for Y2CoMnO6 and TC ≈ 100 K for Tb2CoMnO6. For Tb2CoMnO6, which contains magnetic rare-earth ions, additional quasielastic scattering due presumably to the fluctuations of large Tb magnetic moments was observed. The present study reveals the magnetic ordering of the Co sublattice. The results of this investigation along with that obtained by us for other compounds indicate the presence of unquenched orbital moments in some of the Co compounds.
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