Abstract
We present the study of frustrated magnets R2M2O7, where R = Gd, Dy, Tb and M = Ti, Zr. Magnetic susceptibility χ and low-temperature magnetization of perfectly ordered pyrochlores R2Ti2O7, partially disordered fluorites R2Zr2O7, and their completely disordered amorphous phases were measured and analyzed. We have found that structural disorder weakens the exchange interaction of the rare-earth ions. Magnetic moments of dysprosium and terbium, obtained from nearly saturated magnetization, are slightly affected by the disorder while the gadolinium moment is completely independent of it. The local structure of the compounds, including oxygen environment of the rare-earth ions, is discussed in terms of the influence of the crystal electric field on the magnetic properties of R2M2O7.
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Notes
We consider the quantities reduced to a mole of rare-earth ions. Here kB is the Boltzmann constant.
All curves were fitted by the dependence (3), but in three cases, the constant C∗ turned out to be zero.
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Acknowledgements
The authors acknowledge ESRF program committee (Grenoble, France) and Kurchatov Synchrotron Radiation Center (Moscow, Russia) program committee for providing the opportunity of XAFS and S-XRD measurements.
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This work was financially supported by the Grant No. 18-12-00133 from Russian Science Foundation.
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Kuznetsov, A.V., Churkin, O.A., Popov, V.V. et al. Magnetization of Crystalline and Amorphous Phases of R2Ti2O7 and R2Zr2O7 (R = Gd, Dy, Tb). J Supercond Nov Magn 33, 2395–2404 (2020). https://doi.org/10.1007/s10948-019-05388-y
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DOI: https://doi.org/10.1007/s10948-019-05388-y