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Rare-earth (RE) based frustrated magnets as typical systems of combiningstrong spin-orbit coupling, geometric frustration and anisotropic exchangeinteractions, can give rise to diverse exotic magnetic ground states such asquantum spin liquid (QSL). The discovery of new RE-based frustrated materialsis crucial for exploring the exotic magnetic phases. Herein, we report thesynthesis, structure and magnetic properties of a family of melilite-typeRE2Be2GeO7 (RE = Pr, Nd, Gd-Yb) compounds crystallized in a tetragonalstructure, where magnetic RE3+ ions lay out on Shastry-Sutherland lattice (SSL)within ab-plane and are well separated by nonmagnetic GeBe2O7 polyhedrons alongc-axis. Temperature-dependent susceptibilities and isothermal magnetizationM(H) measurements reveal that most RE2Be2GeO7 compounds except RE=Tb show nomagnetic ordering down to 2 K despite the dominant antiferromagnetic (AFM)interactions, where Tb2Be2GeO7 undergoes AFM transition with Neel temperatureTN~ 2.5 K and field-induced spin flop behaviors (T< TN). In addition, thecalculated magnetic entropy change from the isothermal M(H) curves reveal aviable magnetocaloric effect (MCE) for RE2Be2GeO7 (RE =Gd, Dy) in liquid heliumtemperature regimes, Gd2Be2GeO7 shows maximum Sm up to 54.8 J K-1 Kg-1 at H= 7T and Dy2Be2GeO7 has largest value Sm=16.1 J K-1 kg-1 at H= 2 T in this family.More excitingly, rich diversity of RE ions in this family enables an archetypefor exploring exotic quantum magnetic phenomena with large variability of spinlocated on SSL lattice.

Structure and magnetic properties of melilite-type compounds RE2Be2GeO7 (RE = Pr, Nd, Gd-Yb) with Rare-Earth ions on Shastry-Sutherland lattice