Abstract
In this paper, we investigated the influence of rare-earth ionic radii on spin–phonon coupling in RE2NiMnO6 double perovskites by Raman spectroscopy. Spin–phonons in dense Nd2NiMnO6 and Gd2NiMnO6 ceramics were investigated by Raman spectroscopy at low temperatures. The magnitude of the observed coupling in comparison with other isostructural compounds shows that coupling is not influenced by the rare-earth ionic radius, as well as the deviation in position of the stretching phonon in the ferromagnetic phase in relation to the anharmonic contributions follows a power law.
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