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Superconductivity in the crystallogenide LaFeSiO<sub>1−δ</sub> with squeezed FeSi layers

Physics

Superconductivity in the crystallogenide LaFeSiO<sub>1−δ</sub> with squeezed FeSi layers

M. F. Hansen, J. Vaney, et al.

This study unveils the intriguing discovery of superconductivity in LaFeSiO1−δ, even with a compressed Fe-Si height. With superconductivity emerging at *T*c ~ 10 K and unique non-Fermi-liquid behavior, the research led by M. F. Hansen and colleagues promises to deepen our understanding of the mechanisms behind superconductivity.

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Playback language: English
Abstract
This paper reports the discovery of superconductivity in LaFeSiO<sub>1−δ</sub>, a compound incorporating a crystallogen element (Si). Despite a strongly squeezed Fe-Si height of 0.94 Å (far from the optimal ~1.38 Å for Fe-based superconductors), superconductivity is observed at *T*<sub>c</sub> ~ 10 K. The normal state exhibits non-Fermi-liquid behavior and weak antiferromagnetic fluctuations. First-principles calculations suggest that the Fermi surface is dominated by hole pockets lacking nesting properties, indicating a distinct superconductivity mechanism compared to standard *s*- and *d*-wave scenarios. The simple synthesis makes LaFeSiO<sub>1−δ</sub> a promising platform for studying the interplay between structure, electron correlations, and superconductivity.
Publisher
npj Quantum Materials
Published On
Aug 30, 2022
Authors
M. F. Hansen, J.-B. Vaney, C. Lepoittevin, F. Bernardini, E. Gaudin, V. Nassif, M.-A. Méasson, A. Sulpice, H. Mayaffre, M.-H. Julien, S. Tencé, A. Cano, P. Toulemonde
Tags
superconductivity
LaFeSiO1−δ
Fe-Si height
non-Fermi-liquid behavior
electron correlations
Fermi surface

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