Abstract
The electrical resistance of FeBO3 crystals at high and ultrahigh pressures (up to 198 GPa) and low temperatures has been measured using diamond anvil cells. It has found that in the high-pressure phase, 46 GPa < P < 100 GPa, the activation energy E ac decreases gradually from 0.55 to 0.3 eV according to a linear law. Its extrapolation to zero gives an estimated value of about 210 GPa for the pressure at which complete metallization is expected. However, above 100 GPa, the linear E ac(P) dependence smoothly transforms to a nonlinear one. At the same time, the temperature dependence of the electrical resistance at fixed pressure significantly deviates from the Arrhenius activation law and does not obey the Mott law for the hopping conductivity. Experimental data demonstrate the dependence of the activation energy E ac both on pressure and temperature. At T = 0, the gap tends to zero. Theoretical analysis shows that the decrease in E ac upon cooling can be interpreted in terms of the transition of the low-spin FeBO3 phase to the magnetically ordered (antiferromagnetic) state.
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Original Russian Text © I.A. Troyan, A.G. Gavrilyuk, S.G. Ovchinnikov, I.S. Lyubutin, N.V. Kazak, 2011, published in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2011, Vol. 94, No. 10, pp. 811–815.
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Troyan, I.A., Gavrilyuk, A.G., Ovchinnikov, S.G. et al. Electron transport in FeBO3 ferroborate at ultrahigh pressures. Jetp Lett. 94, 748–752 (2012). https://doi.org/10.1134/S0021364011220115
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DOI: https://doi.org/10.1134/S0021364011220115