Local Probing ErCrO<sub>3</sub>

oleh: Gonçalo N. P. Oliveira, Pedro R. Rodrigues, João G. Correia, João P. E. Araújo, Armandina M. L. Lopes

Format: Article
Diterbitkan: MDPI AG 2022-12-01

Deskripsi

Local distortions in perovskite-like orthochromites are of extreme importance for the properties they exhibit. Here, we present the results of structural and DC magnetisation measurements combined with local probe studies in polycrystalline ErCrO<sub>3</sub>. The electric field gradient (EFG) parameters’ evolution with temperature shows two clear signals of local environment changes, one at the ferroelectric phase transition (<i>T<sub>FE</sub></i>) and the other below 250 K. At the claimed <i>T<sub>FE</sub></i>, the EFG changed from a slightly distorted axial symmetric to an EFG with axial symmetry (evidence that the local point-symmetry of the crystal might have changed). At a temperature around 250 K, we observed the development of a magnetic hyperfine field (MHF) and a change in the EFG to an axial slightly distorted one. These observations are rather in line with our magnetisation measurements, as a relatively strong coercive field was observed well above the Cr sub-lattice ordering temperature.