Hydrogenation of LaFeSi precursor and Crystal and magnetic structure of superconducting LaFeSiH
Last year, a new iron based superconductor, free of toxic elements like As or Se, has been discovered in Bordeaux/France: LaFeSiH, with Tc = 10K. It is isostructural to the well known antiferromagnet LaFeAsO, a parent compound of the superconducting iron-based pnictides discoverd in 2008. The first objective (A) of our proposal is to follow the hydrogenation (preferentially deuteration, to decrease the incoherent background in the patterns due to hydrogen) process of the precuror, LaFeSi, and the desorption of D in a full deuterated LaFeSiD sample by in-situ neutron powder diffraction (and thermogravimetry). In the second objective (B), we propose to perform high resolution NPD on superconducting LaFeSi(H,D) to (1) determine for the first time precisely Ts, the temperature associated to its tetragonal -> orthorhombic transition, and (2) check for long range magnetic order below Ts.
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TOULEMONDE Pierre; CHAIX Laura; Thomas C. Hansen; NASSIF Vivian and TENCE Sophie. (2019). Hydrogenation of LaFeSi precursor and Crystal and magnetic structure of superconducting LaFeSiH. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-23-729
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