133Cs nuclear magnetic resonance study in CsZnCl3 single crystals of perovskite ABX3 type

CsZnCl3 single crystals were grown by the slow evaporation method, and the spin–lattice relaxation rates and resonance lines of the 133Cs nuclei in the resulting crystals were investigated using FT NMR spectrometry. The temperature dependence of the relaxation rate of the 133Cs nuclei in the CsZnCl3 crystals was found to be continuous near TC (=366 K), and was not affected by this phase transition. Our results for CsZnCl3 are compared with those obtained previously for other CsBCl3 (B=Mn, Cu, and Cd) perovskite crystals. The Cs relaxation time of CsCdCl3 is longer than that of CsMnCl3. The differences between the atomic weights of Mn, Cu, Zn, and Cd are responsible for the differences between the spin–lattice relaxation times of these single crystals. The influence of paramagnetic ions is also important in these crystals. The differences between the spin–lattice relaxation times of these crystals could also be due to differences between the electron structures of their metal ions, in particular the structures of the d electrons.