Magnetic and structural properties of the iron silicide superconductor LaFeSiH - Institut de chimie de la matière condensée de Bordeaux Access content directly
Journal Articles Physical Review B Year : 2024

Magnetic and structural properties of the iron silicide superconductor LaFeSiH

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

Abstract

The magnetic and structural properties of the recently discovered pnictogen/chalcogen-free superconductor LaFeSiH have been investigated by 57Fe synchrotron Mössbauer source spectroscopy, X-ray and neutron powder diffraction, and 29Si nuclear magnetic resonance spectroscopy. In contrast with earlier work suggesting the presence of an orthorhombic and magnetic ground state as in underdoped Fe-based pnictides, our results unambiguously establish that LaFeSiH is in fact similar to strongly overdoped Fe-based pnictides: there is no magnetic order (including under hydrostatic pressure up to 18.8 GPa), nor even fluctuating local moments and the system remains tetragonal down to 2 K. This raises the prospect of enhancing the Tc of LaFeSiH by reducing its carrier concentration through appropriate chemical substitutions.
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Dates and versions

hal-04214168 , version 1 (22-05-2024)

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Mads Fonager Hansen, Samar Layek, Jean-Baptiste Vaney, Laura Chaix, Matthew R. Suchomel, et al.. Magnetic and structural properties of the iron silicide superconductor LaFeSiH. Physical Review B, 2024, 109 (17), pp.174523. ⟨10.1103/PhysRevB.109.174523⟩. ⟨hal-04214168⟩
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