A magnetocaloric study on the series of 3d-metal chromites ACr$_{2}$O$_{4}$ where A = Mn, Fe, Co, Ni, Cu and Zn

Anzar Ali; Yogesh Singh

doi:10.1016/j.jmmm.2019.166253

paper

A magnetocaloric study on the series of 3d-metal chromites ACr $_{2}$ O $_{4}$ where A = Mn, Fe, Co, Ni, Cu and Zn

arXiv:1912.00116 · doi:10.1016/j.jmmm.2019.166253

Abstract

The 3d-metal chromites ACr $_{2}$ O $_{4}$ where A is a magnetic ion, show the paramagnetic to ferrimagnetic phase transition at T $_{C}$ while for non-magnetic A-site ion, ACr $_{2}$ O $_{4}$ show paramagnetic to antiferromagnetic phase transition at T $_{N}$ . In this report, we present the detailed study of magnetic and the magnetocaloric effect (MCE) of the 3d-metal chromites ACr $_{2}$ O $_{4}$ (where A = Mn, Fe, Co, Ni, Cu, and Zn) near T $_{C}$ and T $_{N}$ . We find the magnitude of MCE (- $Δ$ S $_{M}$ ) decreases on decreasing the magnetic moment of A-site ion with an exception for CuCr $_{2}$ O $_{4}$ . Additionally, to know more about the order and nature of phase transition, we have made a scaling analysis of (- $Δ$ S $_{M}$ ) for all the chromites across the phase transition temperatures T $_{C}$ and T $_{N}$ .

12 pages, 6 figures, 3 tables

A magnetocaloric study on the series of 3d-metal chromites ACr2​O4​ where A = Mn, Fe, Co, Ni, Cu and Zn

Abstract

A magnetocaloric study on the series of 3d-metal chromites ACr $_{2}$ O $_{4}$ where A = Mn, Fe, Co, Ni, Cu and Zn