Abstract
Polycrystalline ErCo4Ge2 was investigated by magnetic susceptibility and heat capacity measurements. The results show that ErCo4Ge2 undergoes a transition from the paramagnetic to the antiferromagnetic (AFM) state around 2.6 K. The second order character of this magnetic transition is confirmed from the lambda-like peak of the heat capacity data. Both χ′ and χ″ of ErCo4Ge2 are strongly dependent on the ac magnetic field frequency and bias dc magnetic field. A field induced metamagnetic transition from AFM to ferromagnetic state is observed below TN. Under a magnetic field change of 50 kOe, the maximum value of the magnetic entropy change (magnetocaloric effect) −ΔSM is 14.2 J/kg K at 2.75 K and the adiabatic temperature change ΔTad is 5.7 K. In particular, a large −ΔSM value of 11.7 J/kg K is achieved for a low magnetic field change of 20 kOe.
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