Iron-based superconductivity extended to the novel silicide LaFeSiH

Bernardini, F.

First

;Garbarino, G.;Sulpice, A.;Núñez-Regueiro, M.;Gaudin, E.;Chevalier, B.;Méasson, M. -A.;Cano, A.;Tencé, S.

2018-01-01

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Abstract

We report the synthesis and characterization of the novel silicide LaFeSiH displaying superconductivity with onset at 11 K. We find that this pnictogen-free compound is isostructural to LaFeAsO, with a similar low-temperature tetragonal to orthorhombic distortion. Using density functional theory we show that this system is also a multiband metal in which the orthorhombic distortion is likely related to single-stripe antiferromagnetic order. Electrical resistivity and magnetic susceptibility measurements reveal that these features occur side by side with superconductivity, which is suppressed by external pressure.