Abstract
The absorption spectrum of antiferromagnetic dysprosium aluminium garnet (DAG) (T N =2.50 °K) has been investigated at low temperatures.
The groundstate splitting due to all interactions in the antiferromagnetic state is (5.27±0.10) cm−1 extrapolated to 0 °K. The temperature dependence of the lineshift of the absorption lines is measured. Zeeman effect studies give theg-tensor of the groundstate asg z =18.4±0.5,g x =g y =0.5±0.2. The studies also allow the determination of the critical fields asH [100] c =(5.0±0.1) koe,H [111] c =(3.9±0.2) koe andH [110] c =(4.9±0.6) koe. In addition an investigation of a number of satellite lines is performed. Some of them can be interpreted as spin wave sidebands (Stokes and anti-Stokes); others obviously come from dysprosium ions which have impurity ions on regular lattice sites as neighbours.
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We would like to thank Dr. G. Burns for sending us his preprint.
We acknowledge many helpful discussions with Prof. Hellwege. This work was supported by the Deutsche Forschungsgemeinschaft.
Some very useful comments on the manuscript by W. P. Wolf are also very much appreciated.
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Faulhaber, R., Hüfner, S. Optical spectroscopy of Dysprosium Aluminum Garnet (DAG). Z. Physik 228, 235–253 (1969). https://doi.org/10.1007/BF01392130
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DOI: https://doi.org/10.1007/BF01392130