Evidence of Mn-Ion Structural Displacements Correlated with Oxygen Vacancies in La<sub>0.7</sub>Sr<sub>0.3</sub>MnO<sub>3</sub> Interfacial Dead Layers
Piu Rajak, Daniel Knez, Sandeep Kumar Chaluvadi, P. Orgiani, G. Rossi, Laurence Méchin, Regina Ciancio
Abstract
(LSMO) thin films, compatible with the formation of well-known dead layers in manganites, with an elongated out-of-plane lattice parameter and structural and electronic properties well distinguished from the bulk of the film. We observed, for the first time, a structural shift of Mn ions coupled with oxygen vacancies and a reduced Mn valence state within such layer. Understanding the correlation between oxygen vacancies, the Mn oxidation state, and Mn-ion displacements is a prerequisite to engineer the magnetotransport properties of LSMO thin films.
Topics & Concepts
Materials scienceManganiteThin filmTransmission electron microscopyValence (chemistry)Condensed matter physicsDensity functional theoryElectron energy loss spectroscopyIonScanning transmission electron microscopyOxygenChemical physicsNanotechnologyFerromagnetismComputational chemistryOrganic chemistryChemistryPhysicsQuantum mechanicsMagnetic and transport properties of perovskites and related materialsAdvanced Condensed Matter PhysicsElectronic and Structural Properties of Oxides