A complete investigation of the complex magnetic behaviour of Gd 5 Ge 4 by means of linear thermal expansion and magnetostriction measurements (5–300 K, 0–120 kOe) has been carried out. Our results support the suggested existence in this system of a coupled crystallographic–magnetic transition from a Gd 5 Ge 4 -type Pnma (antiferromagnetic) to a Gd 5 Si 4 -type Pnma (ferromagnetic) state. Strong magnetoelastic effects are observed at the field-induced first-order magnetic–martensitic transformation. A revised magnetic and crystallographic H – T phase diagram is proposed.
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Magén et al. (2003) studied this question.
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