Magnetic and structural properties of the iron silicide superconductor LaFeSiH
LAYEK, S.
Magnétisme et Supraconductivité [NEEL - MagSup]
University of Petroleum and Energy Studies [Dehradun] [UPES]
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Magnétisme et Supraconductivité [NEEL - MagSup]
University of Petroleum and Energy Studies [Dehradun] [UPES]
LAYEK, S.
Magnétisme et Supraconductivité [NEEL - MagSup]
University of Petroleum and Energy Studies [Dehradun] [UPES]
Magnétisme et Supraconductivité [NEEL - MagSup]
University of Petroleum and Energy Studies [Dehradun] [UPES]
BERNARDINI, F.
Università degli Studi di Cagliari = University of Cagliari = Université de Cagliari [UniCa]
< Reduce
Università degli Studi di Cagliari = University of Cagliari = Université de Cagliari [UniCa]
Language
en
Document de travail - Pré-publication
This item was published in
2023-09-05
English Abstract
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, ...Read more >
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.Read less <
Origin
Hal imported