Abstract
The effect of high pressures P on the Néel temperature T N , the crystal lattice parameters, and the magnitude of the hyperfine magnetic field H Sn at a nucleus of a diamagnetic tin atom was studied in pure and tin-doped orthoferrites RFeO3 (R = Nd, Lu). The dependence of these quantities on the geometry of the exchange bonds, specifically, the angle and length of the chemical bond Fe-O-Fe(Sn), was analyzed. It was established that under pressure the angular contribution decreases and the radial contribution increases T N and H Sn, the radial contribution being greater than the angular contribution in absolute magnitude. Numerical estimates were obtained for the angular and radial contributions to T N and H Sn. In lutecium orthoferrite, at P > 30 GPa anomalies indicating a possible phase transition were observed in the behavior of the lattice parameters and the value of H Sn.
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Translated from Zhurnal Éksperimental’no\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\) i Teoretichesko\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\) Fiziki, Vol. 117, No. 2, 2000, pp. 375–386.
Original Russian Text Copyright © 2000 by Gavrilyuk, Stepanov, Lyubutin, Stepin, Troyan, Sidorov, Palosz, Stel’makh, Winzenick.
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Gavrilyuk, A.G., Stepanov, G.N., Lyubutin, I.S. et al. Effect of high pressures on exchange and hyperfine interactions in rare-earth orthoferrites. J. Exp. Theor. Phys. 90, 330–340 (2000). https://doi.org/10.1134/1.559108
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DOI: https://doi.org/10.1134/1.559108