Magnetic and structural properties of the iron silicide superconductor LaFeSiH

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...

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Bibliographic Details
Published in:Physical review. B 2024-05, Vol.109 (17), Article 174523
Main Authors: Hansen, M. F., Layek, S., Vaney, J.-B., Chaix, L., Suchomel, M. R., Mikolasek, M., Garbarino, G., Chumakov, A., Rüffer, R., Nassif, V., Hansen, T., Elkaim, E., Pelletier, T., Mayaffre, H., Bernardini, F., Sulpice, A., Núñez-Regueiro, M., Rodière, P., Cano, A., Tencé, S., Toulemonde, P., Julien, M.-H., d'Astuto, M.
Format: Article
Language:English
Subjects:
Condensed Matter
Materials Science
Physics
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Summary: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.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.109.174523