Abstract
Magnetic and magnetocaloric properties of polycrystalline Ho5Ge4 (orthorhombic, Sm5Ge4-type, Space group Pnma, No. 62, oP36) compound have been studied. This compound orders antiferromagnetically at ~24K (TN). From the magnetization vs field isotherms obtained close to the magnetic transition temperature, magnetocaloric effect (MCE) has been estimated. The isothermal magnetic entropy change (ΔSM) reaches a maximum value of ~−27J/kg-K at ~30K for a field change of 140kOe. A metamagnetic transition is observed in the field dependent magnetization data at temperatures below 20K, for critical fields above 20kOe, giving rise to a ferromagnetic order and hence a large MCE. The magnetic moment value at 2.5K is ~8μB/Ho3+ in 90kOe field.
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