[Susceptibilité nématique électronique dans les supraconducteurs à base de fer]
Nous présentons dans cette revue nos récents résultats expérimentaux concernant la phase nématique électronique des composés BaFe2As2 dopés et FeSe. La susceptibilité nématique, extraite de nos mesures du module de cisaillement (obtenue par des essais de flexion trois points par dilatométrie capacitive) dans le cadre de la théorie de Landau, est comparée aux résultats obtenus par des mesures d'élastorésistivité et de spectroscopie Raman. FeSe est un composé particulièrement intéressant dans ce contexte car son diagramme de phase présente une large phase nématique i.e. une phase paramagnétique accompagnée d'une distorsion structurelle. La loi d'échelle reliant la susceptibilité nématique au taux de relaxation spin-réseau observé par RMN, prédite par la théorie nématique de spin, est observée pour les composés BaFe2As2 dopés en électrons et en trous. La relation complexe entre la susceptibilité nématique et les degrés de liberté orbitaux et de spin est discutée en détail.
We review our recent experimental results on the electronic nematic phase in electron- and hole-doped BaFe2As2 and FeSe. The nematic susceptibility is extracted from shear-modulus data (obtained using a three-point-bending method in a capacitance dilatometer) using Landau theory and is compared to the nematic susceptibility obtained from elastoresistivity and Raman data. FeSe is particularly interesting in this context, because of a large nematic, i.e., a structurally distorted but paramagnetic, region in its phase diagram. Scaling of the nematic susceptibility with the spin lattice relaxation rate from NMR, as predicted by the spin-nematic theory, is found in both electron- and hole-doped BaFe2As2, but not in FeSe. The intricate relationship of the nematic susceptibility to spin and orbital degrees of freedom is discussed.
Mots-clés : Supraconducteurs à base de fer, Propriétés thermodynamiques, Propriétés mécaniques
Anna E. Böhmer 1 ; Christoph Meingast 1
@article{CRPHYS_2016__17_1-2_90_0,
author = {Anna E. B\"ohmer and Christoph Meingast},
title = {Electronic nematic susceptibility of iron-based superconductors},
journal = {Comptes Rendus. Physique},
pages = {90--112},
publisher = {Elsevier},
volume = {17},
number = {1-2},
year = {2016},
doi = {10.1016/j.crhy.2015.07.001},
language = {en},
}
Anna E. Böhmer; Christoph Meingast. Electronic nematic susceptibility of iron-based superconductors. Comptes Rendus. Physique, Iron-based superconductors / Supraconducteurs à base de fer, Volume 17 (2016) no. 1-2, pp. 90-112. doi : 10.1016/j.crhy.2015.07.001. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2015.07.001/
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