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DE PADOVA, P; MARIOT, J.-M; BERTRAN, F; HECKMANN, O; RICHTER, M. C; NDIAYE, W; D'ORAZIO, F; LUCARI, F; CACHO, C. M; HRICOVINI, K; FAVRE, L; BERBEZIER, I; OLIVIERI, B; PERFETTI, P; QUARESIMA, C; OTTAVIANI, C; TALEB-IBRAHIMI, A; LE FEVRE, P
Surface science, 03/2011, Volume: 605, Issue: 5-6Journal Article
An investigation of the structural, magnetic and electronic properties of ≈ 3 nm thick Mn5Ge3 films epitaxially grown on a Ge(1 1 1)-c(2 × 8) reconstructed surface is reported. High resolution transmission electron microscopy and selected area electron diffraction give evidence of 2.2% in-plane compressive strain between the Mn5Ge3 film and the Ge substrate. Magnetooptical Kerr effect measurements show that the films are ferromagnetic with a Curie temperature of ≈ 325 K. The analysis of Ge 3d core level photoelectron spectra of the Mn5Ge3 films allows determining an upper limit of 76 meV for the Ge 3d5/2 core-hole lifetime broadening. The Ge 3d3/2 core-hole lifetime broadening is found to be 15 meV larger than that of the Ge 3d5/2 core hole, because of the existence of a Coster–Kronig decay channel due to the metallic character of Mn5Ge3.
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