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We have studied the magnetic, thermal and magnetotransport properties ofpolycrystalline Gd5Ge3. It is found that the compound is a strongantiferromagnet and does not undergo any strong metamagnetic transition even ina field of 90 kOe. However, a small but visible ferromagnetic component isfound to coexist with the antiferromagnetic order at low temperatures, asrevealed by the anomalies in magnetization, magnetoresistance and heat capacitydata. Our data suggest that the ferromagnetic component is of magnetostructuralin origin, as evidenced by the strong field induced irreversibility of themagnetoresistance and heat capacity isotherms. The first order likemagnetostructural distortion established in this material is found to result ina martensitic like scenario wherein the kinetic arrest controls thefield/temperature dependence of physical properties such as heat capacity andmagnetoresistance.

Anomalous magnetic, transport and thermal properties of Gd5Ge3