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.
@article{arxiv.1701.05010,
title = {Iron-based superconductivity extended to the novel silicide LaFeSiH},
author = {F. Bernardini and G. Garbarino and A. Sulpice and M. Núñez-Regueiro and E. Gaudin and B. Chevalier and M. -A. Méasson and A. Cano and S. Tencé},
journal= {arXiv preprint arXiv:1701.05010},
year = {2018}
}
Comments
5 + epsilon pages, 7 figures, Supplemental Material on demand; v2 includes additional magnetization and resistivity data; v3 includes additional resistivity data from LaFeSiH single crystal