Abstract
In this work, we report an exotic combination of magnetic entropy change (ΔSM =4.56 Jkg-1K−1), refrigerant capacity (RC=190.6 J kg−1) and adiabatic temperature change (ΔTad=6.8 K) for varying magnetic fields (ΔH) from 0 to 5 T, with near-zero hysteresis loss at the critical point of multiphase coexistence of rhombohedral, cubic and tetragonal phases at x=0.9 in Tb1−xGdxCo2 alloys. Additionally, the ΔSM curves cover a broad temperature range of 42 K. Further analysis demonstrates that the excellent magnetocaloric performance observed at the multiphase coexistence point stems from the flattening free energy, which provides minimal energy barriers, enabling magnetic spins to switch between different crystal symmetries.
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