Journal Article Research Support, Non-U.S. Gov't Metals Mott insulators Oxides Published Erratum X-ray absorption spectroscopy X-ray photoemission spectroscopy charge-transfer phenomena computer vision algorithms double perovskites ferromagnetism instrumentation magnetic oxides magnetism metal-to-insulator transition nickelate superlattices orbital polarization oxide interfaces sample-position accuracy sample-position tracking silicon soft X-ray absorption soft X-ray absorption spectroscopy strain sum rules thin films variable temperature inserts