Magnetic and structural properties of the iron silicide superconductor LaFeSiH - Archive ouverte HAL Accéder directement au contenu
Pré-Publication, Document De Travail Année : 2023

Magnetic and structural properties of the iron silicide superconductor LaFeSiH

Laura Chaix
V. Nassif
Erik Elkaïm
  • Fonction : Auteur
  • PersonId : 1084271
Manuel Núñez-Regueiro
  • Fonction : Auteur
  • PersonId : 1076185
Pierre Rodière
Andrés Cano
Pierre Toulemonde
Matteo d'Astuto

Résumé

The magnetic and structural properties of the recently discovered pnictogen/chalcogen-free superconductor LaFeSiH ($T_c\simeq10$~K) have been investigated by $^{57}$Fe synchrotron M{\"o}ssbauer source (SMS) spectroscopy, x-ray and neutron powder diffraction and $^{29}$Si nuclear magnetic resonance spectroscopy (NMR). No sign of long range magnetic order or local moments has been detected in any of the measurements and LaFeSiH remains tetragonal down to 2 K. The activated temperature dependence of both the NMR Knight shift and the relaxation rate $1/T_1$ is analogous to that observed in strongly overdoped Fe-based superconductors. These results, together with the temperature-independent NMR linewidth, show that LaFeSiH is an homogeneous metal, far from any magnetic or nematic instability, and with similar Fermi surface properties as strongly overdoped iron pnictides. This raises the prospect of enhancing the $T_c$ of LaFeSiH by reducing its carrier concentration through appropriate chemical substitutions. Additional SMS spectroscopy measurements under hydrostatic pressure up to 18.8~GPa found no measurable hyperfine field.

Domaines

Matériaux

Dates et versions

hal-04214168 , version 1 (21-09-2023)

Identifiants

Citer

M. F. Hansen, S. Layek, Jean-Baptiste Vaney, Laura Chaix, Matthew R. Suchomel, et al.. Magnetic and structural properties of the iron silicide superconductor LaFeSiH. 2023. ⟨hal-04214168⟩
26 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More