[Étude du magnétisme quantique moderne par diffusion des neutrons]
Nous passons en revue une sélection des applications récentes de la diffusion neutronique dans le domaine du magnétisme quantique. Nous nous concentrons sur des systèmes où, du fait des fluctuations quantiques amplifiées par la frustration et la basse dimension, l'état fondamental ne présente pas d'ordre magnétique à longue portée. Nous détaillons deux exemples afin de montrer comment les études neutroniques, conjointement à d'autres techniques expérimentales, peuvent apporter de nouvelles connaissances. Le premier est l'échelle de spin NaV2O5 où l'origine du gap de spin à basse température est maintenant comprise en détail. Les contradictions apparentes entre les mesures quantitatives de l'ordre de charge par diffusion inélastique des neutrons, diffraction résonante des rayons X et RMN ont été résolues, conduisant à des résultats intéressants sur les corrélations. Le second exemple est le système à dimères de spins Cs3Cr2
We review a selection of recent applications of neutron scattering to the field of quantum magnetism. We focus on systems where, because of quantum fluctuations enhanced by frustration and low dimension, there is no long range magnetic order in the ground state. We select two examples that we treat in more depth to show how neutron studies, in conjunction with the results of other experimental techniques, can give new insights. The first is the case of the spin ladder NaV2O5, where the origin of the spin gap at low temperature is now understood in detail. Apparent contradictions between quantitative measures of the charge order from neutron inelastic scattering, resonant X-ray scattering and NMR have been resolved giving interesting insights into the correlations. The second case is that of spin dimer system Cs3Cr2
Mots-clés : Magnétisme à basse dimension, Ordre magnétique induit sous champ, Excitations de spin, Diffusion magnétique des neutrons
Béatrice Grenier 1 ; Timothy Ziman 2
@article{CRPHYS_2007__8_7-8_717_0,
author = {B\'eatrice Grenier and Timothy Ziman},
title = {Modern quantum magnetism by means of neutron scattering},
journal = {Comptes Rendus. Physique},
pages = {717--736},
publisher = {Elsevier},
volume = {8},
number = {7-8},
year = {2007},
doi = {10.1016/j.crhy.2007.09.016},
language = {en},
}
Béatrice Grenier; Timothy Ziman. Modern quantum magnetism by means of neutron scattering. Comptes Rendus. Physique, Neutron scattering: a comprehensive tool for condensed matter research, Volume 8 (2007) no. 7-8, pp. 717-736. doi : 10.1016/j.crhy.2007.09.016. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2007.09.016/
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