Abstract
By performing a series of thermodynamic measurements in an applied magnetic field , we investigated the effects of Eu substitution on the Pr sites in the filled skutterudite compound (). A heat capacity Schottky anomaly is present over the whole doping range. For the samples with , the temperature of the maximum, , shifts to lower temperature with increasing . We argue that this behavior reflects the antiferromagnetic (AFM) ordering of the Eu moments, as the AFM transition is suppressed by . The Schottky anomaly in the samples with shifts to higher temperatures with increasing magnetic field, signaling the presence of an internal magnetic field due to short-range AFM correlations induced by magnetic moments of neighboring Eu sites. In low , the Schottky gaps show a nonlinear relationship with as the magnetic moments become weakly magnetized. In high , the magnetic moments of Eu sites become completely aligned with . Thus, increasing does not further increase the magnetization; hence the Schottky gaps increase linearly with .
- Received 13 February 2019
- Revised 17 October 2019
DOI:https://doi.org/10.1103/PhysRevB.100.174509
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