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By working out the Bethe sum rule, a boundary condition that takes the form of a linear equality is derived for the fine structure observed in ionization edges present in electron energy-loss spectra. This condition is subsequently used as a constrai

Externí odkaz: http://arxiv.org/abs/2408.11870

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Relativistic EELS scattering cross-sections for microanalysis based on Dirac solutions

Autor: Zhang, Zezhong, Lobato, Ivan, Brown, Hamish, Lamoen, Dirk, Jannis, Daen, Verbeeck, Johan, Van Aert, Sandra, Nellist, Peter D.

The rich information of electron energy-loss spectroscopy (EELS) comes from the complex inelastic scattering process whereby fast electrons transfer energy and momentum to atoms, exciting bound electrons from their ground states to higher unoccupied

Externí odkaz: http://arxiv.org/abs/2405.10151

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Imaging the suppression of ferromagnetism in LaMnO$_3$ by metallic overlayers

Autor: Folkers, Bart, Jansen, Thies, Roskamp, Thijs J., Reith, Pim, Timmermans, André, Jannis, Daen, Gauquelin, Nicolas, Verbeeck, Johan, Hilgenkamp, Hans, Rosário, Carlos M. M.

Publikováno v: Phys. Rev. Materials 8, 054408,13 May 2024

LaMnO$_3$ (LMO) thin films epitaxially grown on SrTiO$_3$ (STO) usually exhibit ferromagnetism above a critical layer thickness. We report the use of scanning SQUID microscopy (SSM) to study the suppression of the ferromagnetism in STO/LMO/metal stru

Externí odkaz: http://arxiv.org/abs/2310.05514

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Convexity constraints on linear background models for electron energy-loss spectra

Autor: Broek, Wouter Van den, Jannis, Daen, Verbeeck, Jo

Publikováno v: Ultramicroscopy 254 (2023) 113830

In this paper convexity constraints are derived for a background model of electron energy loss spectra (EELS) that is linear in the fitting parameters. The model outperforms a power-law both on experimental and simulated backgrounds, especially for w

Externí odkaz: http://arxiv.org/abs/2308.15301

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Pattern Formation by Electric-field Quench in Mott Crystal

Autor: Gauquelin, Nicolas, Forte, Filomena, Jannis, Daen, Fittipaldi, Rosalba, Autieri, Carmine, Cuono, Giuseppe, Granata, Veronica, Lettieri, Mariateresa, Noce, Canio, Granozio, Fabio Miletto, Vecchione, Antonio, Verbeeck, Johan, Cuoco, Mario

The control of Mott phase is intertwined with the spatial reorganization of the electronic states. Out-of-equilibrium driving forces typically lead to electronic patterns that are absent at equilibrium, whose nature is however often elusive. Here, we

Externí odkaz: http://arxiv.org/abs/2305.19596

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