Low Magnetic Field Magnetocaloric Effect in $\text {Gd}_{\mathrm {5-}_{x}}$EuxGe4

The magnetocaloric effect is investigated for \(\text {Gd}_{\mathrm {5-}_{x}}\)Eu _x Ge₄ (0.25 ≤ x ≤ 2) system near a phase transition from a ferromagnetic to a paramagnetic state as a function of temperature with low external magnetic field change of 100 Oe. The sample with x = 1 has the smallest value of maximum magnetic entropy change and the specific heat change, and highest values of full-width at half-maximum and relative cooling power. The results indicate that the \(\text {Gd}_{\mathrm {5-}_{x}}\)Eu _x Ge₄ system has a prospective application for magnetic refrigerant in an extended high temperature range. Consequently, \(\text {Gd}_{\mathrm {5-}_{x}}\)Eu _x Ge₄ compounds are very attractive candidates for magnetic refrigeration applications, especially nitrogen liquefier.