Abstract
The high-pressure magnetic states of iron borate 57FeBO3 single-crystal and powder samples have been investigated in diamond anvil cells by nuclear forward scattering (NFS) of synchrotron radiation at different temperatures. In the low-pressure (0 < P < 46 GPa) antiferromagnetic phase, an increase of the Neél temperature from 350 to 595 K induced by pressure was found. At pressures 46–49 GPa, a transition from the antiferromagnetic to a new magnetic state with a weak magnetic moment (magnetic collapse) was discovered. It is attributed to the electronic transition in Fe3+ ions from the high-spin 3d 5 (S = 5/2, 6 A 1g ) to the low-spin (S = 1/2, 2 T 2g ) state (spin crossover) due to the insulator-semiconductor-type transition with extensive suppression of strong d-d electron correlations. At low temperatures, NFS spectra of the high-pressure phase indicate magnetic correlations in the low-spin system with a magnetic ordering temperature of about 50 K. A tentative magnetic P-T phase diagram of FeBO3 is proposed. An important feature of this diagram is the presence of two triple points where magnetic and paramagnetic phases of the high-spin and low-spin states coexist.
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From Zhurnal Éksperimental’noĭ i Teoreticheskoĭ Fiziki, Vol. 127, No. 4, 2005, pp. 780–789.
Original English Text Copyright © 2005 by Gavriliuk, Trojan, Lyubutin, Ovchinnikov, Sarkissian.
This article was submitted by the authors in English.
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Gavriliuk, A.G., Trojan, I.A., Lyubutin, I.S. et al. High-pressure magnetic properties and P-T phase diagram of iron borate. J. Exp. Theor. Phys. 100, 688–696 (2005). https://doi.org/10.1134/1.1926429
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DOI: https://doi.org/10.1134/1.1926429