2024/03/04 by S. Mohanty, A. Magar, Mohanty, S. +13 · 2 citations
Materials Science · #Crystal Structures and Properties #FOS: Physical sciences #Magnetic and transport properties of perovskites and related materials #Materials Science (cond-mat.mtrl-sci) #Multiferroics and related materials #Strongly Correlated Electrons (cond-mat.str-el)
paper · pdf · doi:10.48550/arxiv.2403.02082
openalex publication_date 2024/03/04 · openalex created_date 2024/03/06 · openalex updated_date 2026/07/28
A detailed study of the magnetic and magnetocaloric properties of a garnet compound Mn3Cr2Ge3O12 is carried out using x-ray diffraction, magnetization, heat capacity, and neutron diffraction measurements as well as ab initio band-structure calculations. This compound manifests two successive magnetic transitions at T\rm N1 ≃ 4.5 K and T\rm N2 ≃ 2.7 K. Neutron powder diffraction experiments reveal that these two transitions correspond to the collinear and non-collinear antiferromagnetic ordering of the nonfrustrated Cr3+ and frustrated Mn2+ sublattices, respectively. The interactions within each of the Cr and Mn sublattices are antiferromagnetic, while the inter-sublattice interactions are ferromagnetic. The H-T phase diagram is quite complex and displays multiple phases under magnetic field, which can be attributed to the frustrated nature of the spin lattice. Mn3Cr2Ge3O12 shows a large magnetocaloric effect with a maximum value of isothermal entropy change ΔS\rm m ≃ -23 J/kg-K and adiabatic temperature change ΔT\rm ad ≃ 9 K for a field change of 7 T. Further, a large value of the relative cooling power (RCP ≃ 360 J/kg) demonstrates the promise of using this compound in magnetic refrigeration.