87Rb NMR study 87Rb NMR study at the cubic to tetragonal phase transition in RbCaF 3 Abstract The 87Rb nuclear magnetic resonance spectrum, in perovskite single crystal of RbCaF3, is studied above and below the cubic-to-tetragonal phase transition occurring at 198 K. In the high-temperature cubic phase, the temperature dependence of the resonance line amplitude […]