Magnetic and structural properties of the iron silicide superconductor LaFeSiH
M. F. Hansen, S. Layek, J.-B. Vaney, L. Chaix, M. R. Suchomel, M. Mikolasek, G. Garbarino, A. Chumakov, R. Rüffer, V. Nassif, T. Hansen, E. Elkaim, T. Pelletier, H. Mayaffre, F. Bernardini, A. Sulpice, M. Núñez-Regueiro, P. Rodière, A. Cano, S. Tencé, P. Toulemonde, M.-H. Julien, M. d'Astuto
DOI 10.1103/PhysRevB.109.174523 · Physical Review B
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Abstract
The magnetic and structural properties of the recently discovered pnictogen/chalcogen-free superconductor LaFeSiH have been investigated by Fe57 synchrotron Mössbauer source spectroscopy, X-ray and neutron powder diffraction, and Si29 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LaFeSiH Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10 | Pressure unresolved | onset |
| LaFeSiH Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10 | Pressure unresolved | unknown |
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