Issue |
EPL
Volume 146, Number 4, May 2024
|
|
---|---|---|
Article Number | 46002 | |
Number of page(s) | 6 | |
Section | Condensed matter and materials physics | |
DOI | https://doi.org/10.1209/0295-5075/ad3b37 | |
Published online | 28 May 2024 |
Lattice dynamics in the FeSi-based family of superconductors
1 CNRS, Université Grenoble Alpes, Institut Néel - F-38042 Grenoble, France
2 Department of Physics, School of Advanced Engineering, University of Petroleum and Energy Studies (UPES) Dehradun, Uttarakhand 248007, India
3 Earth and Planets Laboratory, Carnegie Institution for Science - 5241 Broad Branch Road, NW, Washington, DC 20015, USA
4 Univ. Bordeaux, CNRS, Bordeaux INP, ICMCB, UMR 5026 - F-33600 Pessac, France
5 Normandie Université, ENSICAEN, UNICAEN, CNRS, CRISMAT - F-14000 Caen, France
Received: 17 November 2023
Accepted: 5 April 2024
The lattice dynamics of the superconducting materials LaFeSiH and LaFeSiO1-δ as well as their intermetallic precursor LaFeSi are investigated by polarized Raman spectroscopy and first-principles calculations, together with X-ray and advanced electron diffraction techniques for their structural analysis. We find that the Fe-dominated Raman-active modes reflect the chemical peculiarities of these silicides compared to their pnictide counterparts, with enhanced structural couplings between the FeSi layer and the spacer that can be related to the ionic vs. covalent character of the latter. In addition, we find signatures of enhanced electron-phonon coupling for some of the Raman-active modes. Beyond that, our study reveals intriguing Fe-based Raman features as well as structural subtleties in LaFeSiH suggesting that this superconductor may formally be non-centrosymmetric.
© 2024 EPLA
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