Abstract
A diamond anvil cell is used to investigate the effect of high pressure (up to 37.5 GPa) on the optical absorption spectra of a single crystal of nickel oxide (NiO). In addition, strain-gage measurements are used to experimentally investigate the V(P) equation of state at a hydrostatic pressure of up to 8.5 GPa in a high-pressure chamber of the “toroid” type. Measurements are performed at room temperature. Absorption bands are observed, which correspond to optical d-d transitions of Ni2+ ion in the crystal field of ligands 3A2g → 3T2g, 3A2g → {au1}E1g, 3A2g → 3T1g(F), and 3A2g → 1T2g. The values of energy of these transitions increase linearly with pressure, and their pressure coefficients are 7.3 ± 0.2, 2.87 ± 0.9, 9.7 ± 0.5, and 8.9 ± 0.3 meV/GPa, respectively. The pressure derivative of the crystal field parameter 10Dq corresponding to the 3A2g → 3T2g transition gives the pressure dependence of the magnitude of exchange integral J in the Anderson hybridization model. It is found that, in the pressure range from zero to 37.5 GPa, the behavior of the exchange integral J is largely defined by the hybridization parameter b = (10Dq/3). At the same time, the Coulomb interaction parameter Ueff is independent of pressure and, therefore, has no effect on the variation of J. The Coulomb interaction Ueff ≈ 7.47 ± 0.005 eV is determined. The experimental data on the equation of state are used to derive the \(J \propto V^\varepsilon \) correlation, where ε = −2.99 ± 0.15, which is in good agreement with the predictions of Bloch’s theory (ε = −10/3).
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Translated from Zhurnal Éksperimental’noĭ i Teoreticheskoĭ Fiziki, Vol. 119, No. 4, 2001, pp. 799–804.
Original Russian Text Copyright © 2001 by Gavrilyuk, Troyan, Lyubutin, Sidorov.
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Gavrilyuk, A.G., Troyan, I.A., Lyubutin, I.S. et al. The effect of high pressure on the structure and on the magnetic and electronic properties of nickel monoxide. J Exp Theor Phys 92, 696–700 (2001). https://doi.org/10.1134/1.1371350
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DOI: https://doi.org/10.1134/1.1371350