Cationic and charge segregation in La2/3Ca1/3MnO3 thin films grown on (001) and (110) SrTiO3 - Université de Lille
Article Dans Une Revue Applied Physics Letters Année : 2008

Cationic and charge segregation in La2/3Ca1/3MnO3 thin films grown on (001) and (110) SrTiO3

Résumé

Electron energy-loss spectroscopy is used to map composition and electronic states in epitaxial La2/3Ca1/3MnO3 films grown on SrTiO3 (001) and (110) substrates. It is found that in partially relaxed (110) films cationic composition and valence state of Mn3+/4+ ions are preserved across the film thickness. In contrast, in fully strained (001) films, the Ca/La ratio gradually changes across the film, being La rich at film/substrate interface and La depleted at free surface; Mn valence state changes accordingly. These observations suggest that a strongly orientation-dependent adaptative composition mechanism dominates stress accommodation in manganite films and provides microscopic understanding of their dissimilar magnetic properties.

Dates et versions

hal-04433944 , version 1 (02-02-2024)

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Citer

S. Estradé, J. Arbiol, F. Peiró, I. C. Infante, F. Sánchez, et al.. Cationic and charge segregation in La2/3Ca1/3MnO3 thin films grown on (001) and (110) SrTiO3. Applied Physics Letters, 2008, Applied Physics Letters, 93 (11), ⟨10.1063/1.2981574⟩. ⟨hal-04433944⟩
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