We investigate the previously observed superconductivity in ferromagnetic SmN in the context of the breakdown of order between two magnetic phases. Nitrogen vacancy doped SmN 1-δ is a semiconductor which lies in the intermediary between ferromagnetic SmN and anti-ferromagnetic Sm. Optical data reported here corroborate the prediction that electrical transport is mediated by Sm 4f defect states, and electrical transport measurements characterise the metal-insulator transition over the doping range. Our measurements show that the superconducting state in nitrogen vacancy doped SmN 1-δ is the most robust near the breakdown of magnetic order, and indicate the location of a quantum critical point. Furthermore we provide additional evidence that the superconducting state is formed from majority spin electrons and thus of unconventional S = 1 type.
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Preferred citation
Holmes-Hewett, W. F., Van Koughnet, K., Miller, J. D., Trewick, E. X. M., Ruck, B. J., Trodahl, H. J. & Buckley, R. G. (2023). Indications of a ferromagnetic quantum critical point in SmN 1-δ. Scientific Reports, 13(1), 19775-. https://doi.org/10.1038/s41598-023-46911-5