XAS/XES study of novel Ni+ oxyfluorides

The novel Ni+ superconductors were found only in late 2020, but have already sparked the field of superconductor research with new enthusiasm. This is due to their similarities (and crucial differences) when compared to the high-Tc cuprate superconductors. The currently known Ni superconductors are all very thin films and the question remains whether the superconductivity in these films is related to interfacial effects. There is thus a great need for bulk Ni+ superconductors. In this work we characterize some promising Ni+ containing oxyfluoride materials that could serve as host structures for future bulk Ni+ superconductors. We wish to understand the local coordination and Ni+ electronic structure to better be able to tune the materials' properties in the future.