In-situ study of hydrogenation dynamics and structure development in LaFeSiD_x using thermograviometry and neutron diffraction.
With the recent discovery of the novel iron-based superconductor LaFeSiH it is of great interest to understand how the physical properties and the structure changes with different levels of H in the range 0<x(H)<1. We propose to probe the structure of the compound in-situ using neutron diffraction coupled with thermogravitometry during the absorption and desorption of H (D will substitute H in the experiment). This experiment will allow us to understand the intermediate structure between the fully hydrogenated and de-hydrogenated compound (which is not superconducting). By understanding the structural changes in the compound and linking it to subsequent physical properties measurements we can gain a further insight to the underlying physics of this iron-based superconductor. The mechanisms behind iron-based superconductivity is still debated to this day and the outcome of this experiment will serve as a piece of the puzzle in understanding these mechanisms.
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FONAGER HANSEN Mads; NASSIF Vivian; PUENTE ORENCH Ines; TENCE Sophie; TOULEMONDE Pierre and VANEY Jean Baptiste. (2021). In-situ study of hydrogenation dynamics and structure development in LaFeSiD_x using thermograviometry and neutron diffraction.. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-24-657
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