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Indications of a ferromagnetic quantum critical point in SmN 1-δ

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posted on 2024-03-27, 02:05 authored by William Holmes-HewettWilliam Holmes-Hewett, K Van Koughnet, JD Miller, EXM Trewick, Benjamin RuckBenjamin Ruck, Harry TrodahlHarry Trodahl, Robert Buckley
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.

History

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

Journal title

Scientific Reports

Volume

13

Issue

1

Publication date

2023-12-01

Pagination

19775

Publisher

Springer Science and Business Media LLC

Publication status

Published

Online publication date

2023-11-13

ISSN

2045-2322

eISSN

2045-2322

Article number

19775

Language

en

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