| Popis: |
Magnetization, electrical resistivity, specific-heat and thermal-expansion measurements have been made on Gd-Y-Lu single crystals. Low isofield magnetization data for the $a$-axis sample of ${\mathrm{Gd}}_{75}$${\mathrm{Y}}_{17.5}$ ${\mathrm{Lu}}_{7.5}$ exhibit two different Curie-Weiss regimes, which suggests double ferromagnetism. Electrical resistivity, specific-heat, and thermal-expansion data show two anomalies at the transition temperatures. The anomaly at 231.5 K shows a $\ensuremath{\lambda}$-type second-order phase transition and the anomaly at 223 K shows a sharp spike first-order phase transition. |
