# Iron-based superconductivity extended to the novel silicide LaFeSiH

## TL;DR

This paper reports the discovery of superconductivity at 11 K in a novel iron-based silicide LaFeSiH, expanding the family of iron-based superconductors and exploring its structural and magnetic properties.

## Contribution

The study introduces a new pnictogen-free iron-based superconductor LaFeSiH, demonstrating its structural similarity to LaFeAsO and analyzing its magnetic and superconducting behavior.

## Key findings

- Superconductivity with onset at 11 K in LaFeSiH
- Orthorhombic distortion linked to magnetic order
- Superconductivity suppressed by external pressure

## 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.