Neutron magnetic form factor in studies of f-electron instability

P.A. Alekseev^†^a, b, V.N. Lazukov^‡^a, P.S. Savchenkov^§^a, b
^aNational Research Centre ‘Kurchatov Institute’, pl. akad. Kurchatova 1, Moscow, 123182, Russian Federation
^bNational Research Nuclear University ‘MEPhI’, Kashirskoe shosse 31, Moscow, 115409, Russian Federation

The main results obtained in measurements of neutron magnetic form factors for rare earth systems with strong electronic correlations are presented. It is shown that in some cases neutron spectroscopy methods can provide information on the valence unstable state in the f-electron system, which is unique as regards the development of adequate physical concepts. Studies of the magnetic form factor in intermediate-valence systems based on Sm (SmB₆, SmS) and Eu (EuCu₂Si₂2 type) and their impact on the shaping of a realistic description of the physical nature of the intermediate valence state are discussed in detail.

Keywords: neutron spectroscopy, intermediate valence, magnetic form factor, strongly correlated electron systems
PACS: 61.05.F−, 61.66.Dk, 75.10.−b, 75.30.Mb, 75.40.Gb (all)
DOI: 10.3367/UFNe.2024.09.039748
URL: https://ufn.ru/en/articles/2025/7/b/
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2-s2.0-105013789370
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2025PhyU...68..653A
Citation: Alekseev P A, Lazukov V N, Savchenkov P S "Neutron magnetic form factor in studies of f-electron instability" Phys. Usp. 68 653–667 (2025)

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@article{Alekseev:2025,
	author = {P. A. Alekseev and V. N. Lazukov and P. S. Savchenkov},
	title = {Neutron magnetic form factor in studies of f-electron instability},
	publisher = {Physics-Uspekhi},
	year = {2025},
	journal = {Phys. Usp.},
	volume = {68},
	number = {7},
	pages = {653-667},
	url = {https://ufn.ru/en/articles/2025/7/b/},
	doi = {10.3367/UFNe.2024.09.039748}
}

Received: 2nd, July 2024, revised: 4th, September 2024, accepted: 9th, September 2024

Оригинал: Алексеев П А, Лазуков В Н, Савченков П С «Нейтронный магнитный формфактор в исследованиях f-электронной нестабильности» УФН 195 695–711 (2025); DOI: 10.3367/UFNr.2024.09.039748