2024/06/25 by R. Kolay, A. Magar, Kolay, R. +5
Engineering · Materials Science · Mathematics · #FOS: Physical sciences #Holomorphic and Operator Theory #Materials Science (cond-mat.mtrl-sci) #Microwave Dielectric Ceramics Synthesis #Multiferroics and related materials
paper · pdf · doi:10.48550/arxiv.2406.17623
openalex publication_date 2024/06/25 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
A detailed study of the structural and magnetic properties of the spin-3/2 hyperkagome lattice compound Li2MgMn3O8 is reported. This material shows ferromagnetic response below T\rm C ≃ 20.6 K, the temperature almost three times lower than the Curie-Weiss temperature θ\rm CW ≃ 56.6 K. Density-functional band-structure calculations suggest that this reduction in T\rm C may be caused by long-range antiferromagnetic couplings that frustrate nearest-neighbor ferromagnetic couplings on the hyperkagome lattice. Large magnetocaloric effect is observed around the T\rm C with a maximum value of isothermal entropy change ΔS\rm m≃ 20 J/kg-K and a maximum relative cooling power of RCP≃ 840 J/kg for the 7 T magnetic field change. Critical analysis of the magnetization data and scaling analysis of the magnetocaloric effect suggest the 3D Heisenberg/XY universality class of the transition. The DC and AC magnetization measurements further reveal glassy nature of the ferromagnetic transition. A detailed study of the non-equilibrium dynamics via magnetic relaxation and memory effect measurements demonstrates that the system evolves through a large number of intermediate metastable states and manifests significant memory effect in the cluster-glass state.