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Electronic Properties of Fully Strained La 1– x Sr x MnO 3 Thin Films Grown by Molecular Beam Epitaxy (0.15 ≤ x ≤ 0.45)

Abstract : The structural, electronic, and magnetic properties of Sr-holedoped epitaxial La 1−x Sr x MnO 3 (0.15 ≤ x ≤ 0.45) thin films deposited using the molecular beam epitaxy technique on 4°vicinal STO (001) substrates are probed by the combination of X-ray diffraction and various synchrotron-based spectroscopy techniques. The structural characterizations evidence a significant shift in the LSMO (002) peak to the higher diffraction angles owing to the increase in Sr doping concentrations in thin films. The nature of the LSMO Mn mixed-valence state was estimated from X-ray photoemission spectroscopy together with the relative changes in the Mn L 2,3 edges observed in X-ray absorption spectroscopy (XAS), both strongly affected by doping. CTM4XAS simulations at the XAS Mn L 2,3 edges reveal the combination of epitaxial strain, and different MnO 6 crystal field splitting give rise to a peak at ∼641 eV. The observed changes in the occupancy of the e g and the t 2g orbitals as well as their binding energy positions toward the Fermi level with hole doping are discussed. The room-temperature magnetic properties were probed at the end by circular dichroism.
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Contributor : Laurence Méchin Connect in order to contact the contributor
Submitted on : Monday, April 25, 2022 - 9:59:46 AM
Last modification on : Saturday, June 25, 2022 - 9:57:37 AM
Long-term archiving on: : Tuesday, July 26, 2022 - 6:32:59 PM

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Sandeep Kumar Chaluvadi, Vincent Polewczyk, Aleksandr Yu Petrov, Giovanni Vinai, Luca Braglia, et al.. Electronic Properties of Fully Strained La 1– x Sr x MnO 3 Thin Films Grown by Molecular Beam Epitaxy (0.15 ≤ x ≤ 0.45). ACS Omega, ACS Publications, 2022, ⟨10.1021/acsomega.1c06529⟩. ⟨hal-03650503⟩

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