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Article Dans Une Revue Npj Quantum Materials Année : 2022

Superconductivity in the crystallogenide LaFeSiO1−δ with squeezed FeSi layers

V. Nassif
M.-A. Méasson
Andrés Cano
Pierre Toulemonde

Résumé

Pnictogens and chalcogens are both viable anions for promoting Fe-based superconductivity, and intense research activity in the related families has established a systematic correlation between the Fe-anion height and the superconducting critical temperature T c , with an optimum Fe-anion height of ~1.38 Å. Here, we report the discovery of superconductivity in the compound LaFeSiO 1− δ that incorporates a crystallogen element, Si, and challenges the above picture: considering the strongly squeezed Fe–Si height of 0.94 Å, the superconducting transition at T c = 10 K is unusually high. In the normal state, the resistivity displays non-Fermi-liquid behavior while NMR experiments evidence weak antiferromagnetic fluctuations. According to first-principles calculations, the Fermi surface of this material is dominated by hole pockets without nesting properties, which explains the strongly suppressed tendency toward magnetic order and suggests that the emergence of superconductivity materializes in a distinct set-up, as compared to the standard s ± - and d -wave electron-pocket-based situations. These properties and its simple-to-implement synthesis make LaFeSiO 1− δ a particularly promising platform to study the interplay between structure, electron correlations, and superconductivity.
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Dates et versions

hal-03772788 , version 1 (08-09-2022)

Identifiants

Citer

Mad F. Hansen, Jean-Baptiste Vaney, Christophe Lepoittevin, F. Bernardini, Etienne Gaudin, et al.. Superconductivity in the crystallogenide LaFeSiO1−δ with squeezed FeSi layers. Npj Quantum Materials, 2022, 7 (1), pp.86. ⟨10.1038/s41535-022-00493-z⟩. ⟨hal-03772788⟩
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