Neutron spectroscopy and strongly correlated electrons: a view from the inside
P.A. Alekseeva,b aNational Research Nuclear University ‘MEPhI’, Kashirskoe shosse 31, Moscow, 115409, Russian Federation bNational Research Centre ‘Kurchatov Institute’, pl. akad. Kurchatova 1, Moscow, 123182, Russian Federation
Neutron spectroscopy results concerning the characteristic features of electronic states in strongly correlated electron systems are reviewed. It is shown that the effects of crystal electric field, exchange interaction and local-itinerant electron hybridization, separately or in combination, manifest themselves in the spectral features of magnetic neutron scattering. The review discusses information that can be obtained from these spectra to be used to investigate the nature of the heavy-fermion, intermediate-valence and a number of other nontrivial types of ground state occurring in this class of systems. Problems with interpreting experimental results are pointed out, suggesting the need for the development of the existing models.
Keywords: inelastic magnetic neutron scattering, rare earth intermetallic compounds, crystal electric field, magnetic ordering, heavy fermions, valence instability PACS:61.05.F−, 61.66.Dk, 63.20.−e, 75.10.−b, 75.30.Mb, 75.40.Gb (all) DOI:10.3367/UFNe.2016.04.037785 URL: https://ufn.ru/en/articles/2017/1/d/ Citation: Alekseev P A "Neutron spectroscopy and strongly correlated electrons: a view from the inside" Phys. Usp.60 58–90 (2017)