Heavy fermions in a high magnetic field

Dai Aoki; William Knafo; Ilya Sheikin

doi:10.1016/j.crhy.2012.11.004

Heavy fermions in a high magnetic field
[Fermions lourds en champ magnétique intense]

Dai Aoki ¹ ; William Knafo ² ; Ilya Sheikin ³

¹ Institut nanosciences et cryogénie, SPSMS, CEA-Grenoble, 17, rue des Martyrs, 38054 Grenoble cedex 9, France
² Laboratoire national des champs magnétiques intenses, UPR 3228, CNRS–UJF–UPS–INSA, 143, avenue de Rangueil, 31400 Toulouse, France
³ Laboratoire national des champs magnétiques intenses, UPR 3228, CNRS–UJF–UPS–INSA, 25, rue des Martyrs, B.P. 166, 38042 Grenoble cedex 9, France

Comptes Rendus. Physique, Volume 14 (2013) no. 1, pp. 53-77.

Résumé
Abstract

Cette revue donne un aperçu des études expérimentales faites depuis 25 ans sur les systèmes à fermions lourds en champ magnétique intense. Les propriétés des transitions de phase magnétiques de composés proches dʼune instabilité antiferromagnétique sont présentées. Les effets dʼun champ magnétique intense sur la surface de Fermi, en particulier la séparation des bandes de spin « up » et « down », sont aussi considérées. Finalement, nous faisons le point sur les avancées récentes dans lʼétude en champ magnétique intense de composés non centrosymétriques et de supraconducteurs ferromagnétiques.

We give an overview on experimental studies performed in the last 25 years on heavy-fermion systems in a high magnetic field. The properties of field-induced magnetic transitions in heavy-fermion materials close to a quantum antiferromagnetic-to-paramagnetic instability are presented. Effects of a high magnetic field to the Fermi surface, in particular the splitting of spin-up and spin-down bands, are also considered. Finally, we review on recent advances on the study of non-centrosymmetric compounds and ferromagnetic superconductors in a high magnetic field.

Publié le : 2013-01-01

DOI : 10.1016/j.crhy.2012.11.004

Keywords: Heavy fermions, High magnetic field, Metamagnetism, Fermi surface, Ferromagnetic superconductors
Mot clés : Fermions lourds, Champ magnétique intense, Métamagnétisme, Surface de Fermi, Supraconducteurs ferromagnétiques

Affiliations des auteurs :

Dai Aoki ¹ ; William Knafo ² ; Ilya Sheikin ³

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Dai Aoki; William Knafo; Ilya Sheikin. Heavy fermions in a high magnetic field. Comptes Rendus. Physique, Volume 14 (2013) no. 1, pp. 53-77. doi : 10.1016/j.crhy.2012.11.004. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2012.11.004/

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When $H_{m}$ is determined from the magnetization or from its uniaxial pressure derivative, the magnetostriction, versus magnetic field, it corresponds to the change to a high magnetization regime, i.e., to the polarized paramagnetic regime. An increase with the temperature of this characteristic field was reported for CeRu₂Si₂ [26], Ce(Ru_0.92Rh_0.08)₂Si₂ [96], and URu₂Si₂ [71], confirming that this definition leads to a scale characteristic of the high-field polarized regime. To extract the characteristic scale of the low-field paramagnetic regime, it is appropriate to consider the temperature $T_{χ}^{\max}$ at the maximum of the magnetic susceptibility versus temperature, or the temperature $T_{α}^{\max}$ at the extremum of the thermal expansion versus temperature (cf. [46,88] for CeRu₂Si₂ and [69] for URu₂Si₂, where $T_{χ}^{\max}$ and $T_{α}^{\max}$ vanish at $H_{m}$ )

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