Inverse magnetocaloric effect in the spin-1/2 Fisher's super-exchange antiferromagnet

The isothermal entropy change and the adiabatic temperature change for the exactly solved spin-1/2 Fisher’s super-exchange antiferromagnet are rigorously calculated in order to examine magnetocaloric properties of the model in a vicinity of the second-order phase transition. It is shown that the large inverse magnetocaloric effect occurs around the temperature interval $T_c(h\mathrm{\ne }0)<T<T_c(h=0)$ for any magnetic-field change $\mathrm{\Delta }h:0\to h$. The most pronounced inverse magnetocaloric effect can be found for the magnetic-field change, which coincides with the critical field of a zero-temperature phase transition from the antiferromagnetically ordered ground state to the paramagnetic one.