Iron-based superconductivity extended to the novel silicide LaFeSiH

F. Bernardini , Gastón Garbarino (1) , André Sulpice (2) , Manuel Núñez-Regueiro (2) , Etienne Gaudin (3) , Bernard Chevalier (3) , Marie-Aude Measson (2) , Andrés Cano (4, 3) , Sophie Tencé (3)

1 ESRF - European Synchrotron Radiation Facility
2 NEEL - MagSup - Magnétisme et Supraconductivité
3 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux
4 NEEL - TMC - Théorie de la Matière Condensée

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.

Domaines: Matériaux

F. Bernardini, Gastón Garbarino, André Sulpice, Manuel Núñez-Regueiro, Etienne Gaudin, et al.. Iron-based superconductivity extended to the novel silicide LaFeSiH. Physical Review B, 2018, 97 (10), pp.100504(R). ⟨10.1103/PhysRevB.97.100504⟩. ⟨hal-01759855⟩