Abstract
We present results on thermodynamic properties of single crystalline NdFe 3(BO 3) 4 studied by means of the specific heat c p ( T) and the magnetic susceptibility χ( T). At high temperatures, we observe no anomalies in c p ( T) and χ( T) obeys a Curie–Weiss law. The onset of long-range antiferromagnetic order at 29 K is accompanied by anomalies in both magnetization and specific heat. A Schottky anomaly is visible in c p at ∼4 K. At ∼6 K a low-temperature anomaly is also found in χ( T) if a magnetic field is applied perpendicular to the c-axis. Both phenomena are related to the depopulation of the upper component of the ground Kramers doublet of Nd 3+ split in the magnetically ordered state.
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