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We report first-principles calculations on the electronic, magnetic, and magnetocaloric properties of the perovskite metal compound Mn 3 GeC. We have studied this compound using a combination of density functional theory calculations (DFT) and Monte Carlo methods. The metallic perovskite Mn 3 GeC materials have a secondary ferromagnetic-paramagnetic transition around T C  = 330 K. Our calculations show that this compound is more stable in the equilibrium state of the ferromagnetic network, estimated in agreement with the experimental parameter. The results of the simulation reveal that the Mn 3 GeC structure behaving of metallic nature; using calculations of first-principles, the magnetic and magnetocaloric properties have been calculated. Additionally, the magnetization and the susceptibility have been determined and the obtained critical temperature T C  is in good agreement with the experimental results. The magnetic entropy and the relative cooling power for different external magnetic fields are obtained around T C .

Magnetic properties and large magnetocaloric effect in the perovskite Mn 3 GeC compound: Ab initio and Monte Carlo calculations