Lattice dynamics in the FeSi-based family of superconductors
Europhysics Letters(2023)
摘要
The lattice dynamics of the superconducting materials LaFeSiH and LaFeSiO 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.
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