A new highly responsive material: spin fluctuations and superconductivity in FeNiB2 system.

By analyzing Fe-Ni-B compositional diagram we predicte a new energetically and dynamically stable FeNiB2 compound. This system belongs to the class of highly response state of material, as it is very sensitive to the external perturbations. This state is also characterized by a high level of spin fluctuations which strongly influence possible magnetic long- and short-range orders. Furthermore, we demonstrate that these antiferromagnetically dominating fluctuations could lead to the appearance of spin mediated superconductivity. The obtained results suggest a promising avenue for the search of strong spin fluctuation systems and related superconductors.