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Spectroscopic analysis reveals absence of magnetic ordering and overdoped metal behavior in LaFeSiH, suggesting reducing carrier concentration could boost critical temperature.
The magnetic and structural properties of the recently discovered pnictogen/chalcogen-free superconductor LaFeSiH (Tc10~K) have been investigated by ⁵⁷Fe synchrotron M{ö}ssbauer source (SMS) spectroscopy, x-ray and neutron powder diffraction and ²⁹Si nuclear magnetic resonance spectroscopy (NMR). No sign of long range magnetic order or local moments has been detected in any of the measurements and LaFeSiH remains tetragonal down to 2 K. The activated temperature dependence of both the NMR Knight shift and the relaxation rate 1/T₁ is analogous to that observed in strongly overdoped Fe-based superconductors. These results, together with the temperature-independent NMR linewidth, show that LaFeSiH is an homogeneous metal, far from any magnetic or nematic instability, and with similar Fermi surface properties as strongly overdoped iron pnictides. This raises the prospect of enhancing the Tc of LaFeSiH by reducing its carrier concentration through appropriate chemical substitutions. Additional SMS spectroscopy measurements under hydrostatic pressure up to 18.8~GPa found no measurable hyperfine field.
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Hansen et al. (2023) studied this question.
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