In this letter we investigated the temperature-dependent Raman spectra of CaMn7O12 helimagnet from room temperature down to 10 K. The temperature dependence of the Raman mode parameters show remarkable anomalies for both antiferromagnetic and incommensurate transitions that this compound undergoes at low temperatures. The anomalies observed at the magnetic ordering transition indicate a spin-phonon coupling at higher-temperature magnetic transition in this material, while a magnetostrinction effect at the lower-temperature magnetic transition.

We report giant reversible barocaloric effects in [(CH3)4N]Mn[N3]3 hybrid organic-inorganic perovskite, near its first-order cubic-monoclinic structural phase transition at T0 ~ 305 K. When driving the transition thermally at atmospheric...