Emerging mechanisms of magnetocaloric effect in phase-separated metals

Giant kinks in the entropy change temperature dependence of the magnetocaloric effect in layered phase-separated metals

“…In contrast to the results for the Bethe lattice, 38 the two-peak behavior of the temperature dependence of the entropy change or a positive phase contribution to the entropy change under an applied the magnetic field are not found. The weakness of PS effects for this lattice can be explained by the fact that appearance of the ferrimagnetic phase between the paramagnetic and antiferromagnetic phases results in two types of phase separation region: PM+Fi (strong FOPT) but with a rather weak ferromagnetic and positive response to a magnetic field; and Fi+AFM (weak FOPT).…”

“…Moreover, m f for the ferrimagnetic phase exhibits a negative response to the magnetic field, which is typical for the PS region (see ref. 38). Fig.…”

“…33, 35, 39, 40 and application to MCE for a Bethe lattice in ref. 38. All sums over k are obtained using integration over a square lattice density of states 42 where is the complete elliptic integral of the first kind.…”