Charge ordering transition in (La, Pr)1/3Sr2/3FeO3−δ with different oxygen concentration investigated by mechanical spectroscopyX. N. Ying, Z. C. Xu, M. F. Liu and C. C. ChenEPL, 110 3 (2015) 36003DOI: https://doi.org/10.1209/0295-5075/110/36003