Magnetocaloric effect in the high-temperature antiferromagnet YbCoC2

The magnetic $H$-$T$ phase diagram and magnetocaloric effect in the recently discovered high-temperature heavy-fermion compound YbCoC${}_2$ have been studied. With the increase in the external magnetic field YbCoC${}_2$ experiences the metamagnetic transition and then transition to the ferromagnetic state. The dependencies of magnetic entropy change -$\mathrm{\Delta }{S}_m(T)$ have segments with positive and negative magnetocaloric effects for $\mathrm{\Delta }H\le 6$~T. For $\mathrm{\Delta }H=9$~T magnetocaloric effect becomes positive with a maximum value of -$\mathrm{\Delta }{S}_m(T)$ is 4.1 J / kg K and a refrigerant capacity is 56.6 J / kg.