Comptes Rendus
Neutron scattering/Diffusion de neutrons
Inelastic neutron scattering study of spin excitations in the superconducting state of high temperature superconductors
[Étude par diffusion inélastique de neutrons des excitations de spin dans la phase supraconductrice des supraconducteurs à haute température]
Comptes Rendus. Physique, Neutron scattering: a comprehensive tool for condensed matter research, Volume 8 (2007) no. 7-8, pp. 745-762.

La diffusion inélastique de neutrons est une technique très efficace qui permet de mesurer les corrélations magnétiques sur une large gamme de vecteurs d'onde et d'énergies. Dans le cadre de l'étude des systèmes d'électrons fortement corrélés, pour lesquels les degrés de liberté des spins, des orbitales, du réseau et des charges sont fortement couplés, cette technique est couramment utilisée pour sonder les propriétés magnétiques et tester leur rôle dans l'établissement de propriétés électroniques exotiques, telles que la supraconductivité non conventionnelle. Dans cet article, nous nous focalisons sur l'observation par diffusion inélastique de neutrons d'un mode d'excitation de spin triplet inhabituel dans la phase supraconductrice des cuprates supraconducteurs à haute température critique, ainsi qu'à son implication dans l'apparition d'anomalies dans le spectre d'excitations des charges. Ce mode est interprété comme un exciton de spin sur la base d'une description itinérante des excitations magnétiques. D'autres interprétations en termes de spins localisés ou impliquant une description mixte itinérante-localisée seront également présentées.

Inelastic neutron scattering is a powerful technique that can measure magnetic correlations in a large momentum and energy range. In strongly correlated electronic systems, where spin, orbital, lattice and charge degrees of freedom are entangled, it is currently used to study the magnetic properties and shed light on their role in the appearance of the exotic electronic properties, such as unconventional superconductivity. In this article, we focus on the observation by inelastic neutron scattering technique of unconventional spin triplet collective modes in the superconducting state of high temperature superconducting cuprates and its interplay with anomalies in the charge excitation spectrum. The triplet spin mode is interpreted as a spin exciton, within a spin band model. Alternative scenarii based on localized or dual (itinerant localized) models are also mentioned.

Publié le :
DOI : 10.1016/j.crhy.2007.07.003
Keywords: Inelastic neutron scattering, Spin dynamics, High temperature superconductivity
Mots-clés : Diffusion inélastique de neutrons, Dynamique de spins, Supraconductivité à haute température

Yvan Sidis 1 ; Stéphane Pailhès 1 ; Vladimir Hinkov 2 ; Benoît Fauqué 1 ; Clemens Ulrich 2 ; Lucia Capogna 3 ; Alexandre Ivanov 3 ; Louis-Pierre Regnault 4 ; Bernhard Keimer 2 ; Philippe Bourges 1

1 Laboratoire Léon-Brillouin, CEA–CNRS, CE-Saclay, 91191 Gif sur Yvette, France
2 Max-Planck-Institut für Fertkörperforschung, 70569 Stuttgart, Germany
3 Institut Laue-Langevin, 156X, 38042 Grenoble cedex 9, France
4 CEA Grenoble, DRFMC 38054 Grenoble cedex 9, France
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     title = {Inelastic neutron scattering study of spin excitations in the superconducting state of high temperature superconductors},
     journal = {Comptes Rendus. Physique},
     pages = {745--762},
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Yvan Sidis; Stéphane Pailhès; Vladimir Hinkov; Benoît Fauqué; Clemens Ulrich; Lucia Capogna; Alexandre Ivanov; Louis-Pierre Regnault; Bernhard Keimer; Philippe Bourges. Inelastic neutron scattering study of spin excitations in the superconducting state of high temperature superconductors. Comptes Rendus. Physique, Neutron scattering: a comprehensive tool for condensed matter research, Volume 8 (2007) no. 7-8, pp. 745-762. doi : 10.1016/j.crhy.2007.07.003. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2007.07.003/

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