Rapid Access: Determination of the Magnetic Properties of LaFeAs1-xPxO Across Multiple Magnetic Regimes

Using NMR spectroscopy, the possible existence of a new magnetic state has been suggested to exist in LaFeAs1-xPxO (for x near 0.5); however, other groups failed to detect any evidence for its existence. Previous measurements we performed on WISH (ISIS) failed to provide signs of magnetic order in our relatively small 1 - 4 g samples. It wasn't until fast preliminary measurements collected on EMU (in less than an hour back in 2018) that proved the bulk magnetic properties of one of these intermediate samples. To our surprise, recent WISH measurements we performed on larger samples in June 2019 demonstrates that all samples with x < 0.9 are long range magnetic with a total of three different magnetic structures strongly competing with superconductivity. EMU measurements are needed to complete the phase diagram. A PhD dissertation and a high impact publication are anticipated.