Phase Diagrams of Uran and Its Compounds. III. Properties of U–Co, U–O. Role of ‘Orbital Glass’

O. I. Mitsek, V. M. Pushkar

G. V. Kurdyumov Institute for Metal Physics, NAS of Ukraine, 36 Academician Vernadsky Blvd., UA-03142 Kyiv, Ukraine

Received: 04.09.2019. Download: PDF

The quantum theory of U$^{238}$ and its alloys (U–Co and U–O), first of all, solves the problem of orbital moments $\textbf{L}_r$ in sites $r$. In symmetric lattice (of metal U) $\textbf{L}_r$ organization is possible by Galois groups after one-side deformation $u_{33}$. Covalent bonds of U ion pair with antiparallel orbital moments create ‘orbital glass’ of elements organized in groups. The form of ‘orbital glass’ parameter $P_{3}(T)$ is determined by antiferromagnons (bosons). Uniaxial group of ‘orbital glass’ gives series of new effects: strong ferromagnetic anisotropy (FMA), higher oxide UO$_{1+m}$, etc. The effects are calculated by means of the method of many-electron operator spinors and chemical bond fluctuations. The experimental data for magnetization, Curie temperature, FMA of Co–U are interpreted.

Key words: spin-orbital covalent bond, ‘orbital glass’, magnetic hardness, superoxides.

URL: http://mfint.imp.kiev.ua/en/abstract/v42/i06/0755.html

DOI: https://doi.org/10.15407/mfint.42.06.0755

PACS: 61.50.Ks, 71.10.-w, 71.20.Gj, 71.30.+h, 75.10.Dg, 75.30.Et

Citation: O. I. Mitsek and V. M. Pushkar, Phase Diagrams of Uran and Its Compounds. III. Properties of U–Co, U–O. Role of ‘Orbital Glass’, Metallofiz. Noveishie Tekhnol., 42, No. 6: 755—765 (2020) (in Russian)


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