Magnetoresistance in La0.5Sr0.5MnO2.5 (pages 2709–2715)
Dr. Raquel Cortés-Gil, Dr. M. Luisa Ruiz-González, Dr. José M. Alonso, Prof. Mar García-Hernández, Prof. Antonio Hernando, Prof. María Vallet-Regí and Prof. José M. González-Calbet
Article first published online: 24 JAN 2011 | DOI: 10.1002/chem.201002080
The coexistence of Mn2+, Mn3+ and Mn4+ in La0.5Sr0.5MnO2.5 leads to nano-ferromagnetic (FM) clusters in octahedral layers acquiring 2D character inside the 3D AFM brownmillerite structure (see figure). Resistance measurements indicate the presence of magnetoresistance (MR) suggesting a temperature-activated conduction process between FM clusters inside an insulating antiferromagnetic matrix. La0.5Sr0.5MnO2.5 is the first MR brownmillerite material in which both octahedral and tetrahedral layers are occupied by Mn atoms.