2025/05/08 by M. Pula, Pula, M., Smita Sharma +9
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Chemical and Physical Properties of Materials #FOS: Physical sciences #Physics of Superconductivity and Magnetism #Strongly Correlated Electrons (cond-mat.str-el)
paper · pdf · doi:10.48550/arxiv.2505.04868
openalex publication_date 2025/05/08 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The recent realization that the rare-earth melilites RE2Be2GeO7 host the Shastry-Sutherland lattice within planes of RE3+ ions has sparked a number of studies. This family of materials lacks appreciable site mixing and conductivity, making them promising candidates for the Shastry-Sutherland model. Herein, we present the magnetic ground states of two of these rare-earth melilites: RE = Gd and Dy. We find, through measurements of magnetic susceptibility, magnetization, and specific heat capacity (RE = Dy only), that these two melilites are antiferromagnets (TN ∼~1~K). Gd2Be2GeO7, in accordance with its electronic configuration, has isotropic single-ion anisotropy but shows a quadratic contribution to its magnetization. Dy2Be2GeO7 has Ising-like single-ion ansiotropy and is likely an effective spin-1/2 system. Both materials exhibit metamagnetic transitions. We identify this transition in Dy2Be2GeO7, occurring at 86(1)~mT for T=500~mK, to likely be a spin-flip transition.