Test of Tricritical Point Scaling in Dysprosium Aluminum Garnet

The scaling hypothesis for a tricritical point has not received any tests from experimental data for magnetic systems. Here, data for dysprosium aluminum garnet are used to test the tricritical scaling hypothesis in the directions ${\overline{x}}_2$, ${\overline{x}}_3$ lying in the $H-T$ plane. Specifically, $M-H-T$ data near the tricritical point are found to collapse from a family of curves to a single curve (scaling function), supporting the validity of a tricritical scaling hypothesis.