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Your search keyword '"Fabrice Scheurer"' showing total 2 results
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2 results on '"Fabrice Scheurer"'

1. Imaging isodensity contours of molecular states with STM

Author

Gaël Reecht, Benjamin W Heinrich, Hervé Bulou, Fabrice Scheurer, Laurent Limot, and Guillaume Schull

Subjects
scanning tunneling microscopy, scanning tunneling spectroscopy, fulleren, C60, super-atomic orbitals, Science, Physics, QC1-999
Abstract

We present an improved way for imaging the density of states of a sample with a scanning tunneling microscope, which consists in mapping the surface topography while keeping the differential conductance (d I /d V ) constant. When archetypical C _60 molecules on Cu(111) are imaged with this method, these so-called iso-d I /d V maps are in excellent agreement with theoretical simulations of the isodensity contours of the molecular orbitals. A direct visualization and unambiguous identification of superatomic C _60 orbitals and their hybridization is then possible.

Published
2017
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2. X-ray magnetic dichroism and tunnel magneto-resistance study of the magnetic phase in epitaxial CrVO x nanoclusters

Author

Loïc Joly, Fabrice Scheurer, Philippe Ohresser, Brice Kengni-Zanguim, Jean-François Dayen, Pierre Seneor, Bruno Dlubak, Florian Godel, and David Halley

Subjects
Condensed Matter::Strongly Correlated Electrons, General Materials Science, Physics::Atomic Physics, Condensed Matter Physics
Abstract

Epitaxial clusters of chromium and chromium–vanadium oxides are studied by tunnel magneto-resistivity measurements, x-ray absorption spectrometry and circular magnetic circular dichroism. They turn out to carry a small magnetic moment that follows a super-paramagnetic behavior. The chromium ion contribution to this magnetization is mainly due to an original magnetic Cr2O3-like phase, whereas usual Cr2O3 is known to be anti-ferromagnetic in the bulk. For mixed clusters, vanadium ions also contribute to the total magnetization and they are coupled to the chromium ion spins. By measuring the dichroic signal at different temperatures, we get insight into the possible spin configurations of vanadium and chromium ions: we propose that the magnetic dipoles observed in the clusters assembly could be related to ionic spins that couple at a very short range, as for instance in short one-dimensional spins chains.

Published
2022
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