A Role of the 3d Electron Subsystem in the Evolution of Band Structure and Magnetic and Optical Properties of ErNi5 – xCox Compounds (x = 0–4)
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The evolution of the electronic structure and optical and magnetic properties of ErNi5 – xCox 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 4f 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 3d 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.
This study was performed within the state contract with the Federal Agency for Scientific Organizations (project Electron, no. AAAA-A18-118020190098-5) and supported in part by the Russian Foundation for Basic Research, project nos. 17-52-45056 and 16‑52-48012.
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