Abstract
We have investigated the optical absorption spectra of metamagnetic DyAlO3 (T N =3.4 °K) above and below the Néel temperature. We find that the magnetic interactions are predominantly between the ions along the crystallographicc-axis; the interaction energy between two ions isW C =− (2.9±0.6) cm−1. Additional line-shifts below 3.4 °K yield the Néel temperature.
Zeeman effect studies give the magnetic moment of the groundstate as μ=(9.2 ± 0.9)μ B . The direction of the magnetic moments is in thea-b plane, with angles of ± 33.5° and ± 146.5° from theb-axis. The Zeeman effect studies reveal two metamagnetic transitions (forH ext∥μ) at 7.0 and 7.3 kOe respectively.
Additional susceptibility and Mössbauer measurements confirm the Néel temperature and the magnetic moment.
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We thank Prof. Dr.Hellwege for his interest in this work. N.Skribanoweitz for his assistance in the preparation of the crystals, and G.Crecelius for performing the Mössbauer experiment. We are indepted to the Deutsche Forschungsgemeinschaft for financial support.
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Schuchert, H., Hüfner, S. & Faulhaber, R. Optical investigation of metamagnetic DyAlO3 . Z. Physik 222, 105–127 (1969). https://doi.org/10.1007/BF01392289
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DOI: https://doi.org/10.1007/BF01392289