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Effect of high pressures on exchange and hyperfine interactions in rare-earth orthoferrites |
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| Authors: | A G Gavrilyuk G N Stepanov I S Lyubutin A S Stepin I A Troyan V A Sidorov B Palosz S Stel’makh M Winzenick |
| Institution: | 1. Institute of High-Pressure Physics, Russian Academy of Sciences, Troitsk, Moscow oblast, 142092, Russia 2. Institute of Crystallography, Russian Academy of Sciences, Moscow, 117333, Russia 3. High Pressure Research Center, Polish Academy of Sciences, Warsaw, Poland 4. Univesit?t-G-H Paderborn, 33098, Paderborn, Germany |
| 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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