We present a theoretical analysis of the magnetocaloric effect in the frustrated antiferromagnet EuIr2P2. Based on a magnetic Hamiltonian with parameters estimated using total energy density functional theory calculations, we perform classical Monte Carlo simulations to obtain the magnetocaloric effect as a function of the temperature and the external magnetic field. We find a large magnetic entropy change ∆S max M ∼ 5.14 J kg −1 K −1 at T = 2.45K for a moderate change in the external magnetic field ∆H = 1.2 Tesla. Magnetic frustration in EuIr2P2 leads to a rich phase diagram with a first order (spin-flop) transition between two antiferromagnetic phases and a continuous transition between a non-collinear antiferromagnetic phase and a high entropy collinear antiferromagnet. A paramagnetic phase for high fields or temperatures completes the phase diagram. A phenomenological Landau functional analysis suggests that the four phases meet at a multicritical point (Tm, Hm), and provides a simplified description of the phase diagram and of the magnetocaloric effect. The highest value of ∆SM is obtained for a temperature T ∼ Tm but it persists with similar values for a broad range of temperatures T Tm.
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