Open AccessРоль 3d-электронной подсистемы в эволюции зонной структуры, магнитных и оптических свойств соединений ErNi-=SUB=-5-x-=/SUB=-Co-=SUB=-x-=/SUB=- (x=0-4)
Author(s) -
Ю.В. Князев,
А.В. Лукоянов,
Ю.И. Кузьмин,
А.Г. Кучин
Publication year - 2019
Publication title -
fizika tverdogo tela
Language(s) - English
Resource type - Journals
eISSN - 1726-7498
pISSN - 0367-3294
DOI - 10.21883/ftt.2019.01.46888.173
Subject(s) - cobalt , materials science , nickel , intermetallic , magnetic moment , optical conductivity , ion , electronic structure , condensed matter physics , analytical chemistry (journal) , atomic physics , chemistry , physics , organic chemistry , alloy , metallurgy , composite material , chromatography
The evolution of the electronic structure and optical and magnetic properties of ErNi_5 – _ x Co_ x compounds ( x = 0–4), occurring upon substitution of nickel by cobalt atoms, has been investigated. Spin-polarization calculations of the band spectrum of these intermetallic compounds have been performed within the local spin density approximation with a correction for strong electron correlations in the 4 f shell of a rare-earth ion (method LSDA+U). The values of magnetic moments for erbium, nickel, and cobalt ions (located at different crystallographic sites) are obtained. The exchange-interaction parameters for the 3 d sublattice of transition metals are determined. The spectral properties of the compounds have been investigated in the wavelength range of 0.22–15 μm by optical ellipsometry. The experimental frequency dependences of the optical conductivity in the interband absorption region are compared with the corresponding characteristics calculated based on the density of electronic states.