Abstract
Single crystals of ErAl 3(BO 3) 4 were produced by flux growing techniques. The principal magnetic susceptibility, χ ⊥, perpendicular to the symmetry axis of the crystal was measured in the range 300-14.2 K, and the principal anisotropy ( χ ∥ − χ ⊥) was determined from 300 to 77 K, which turned out to be negative throughout. A crystal field conforming to D 3 site symmetry (obtained from structural data) accounts very well for the observed thermal variation of the magnetic susceptibilities; this yields g factors, g ∥ and g ⊥, of 2.32 and 8.95, respectively. The electronic heat capacity is computed, and shows a Schottky anomaly at around 45 K. Calculated quadrupole splitting of 167Er due to crystal field effects shows a smooth decrease with decreasing temperature. The hyperfine heat capacity, contributed mainly by magnetic hyperfine splitting, displays a rounded maximum at about 8 mK.
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