Novel magnetism on single crystalline YbMn2Ge2

Abstract Magnetization measurements of single crystal YbMn 2 Ge 2 were performed in temperature range from 4.2 to 290 K under magnetic fields up to 13 T, indicating a novel magnetic phase diagram. The results suggest that the Mn 3d – Mn 3d ferromagnetic interaction enhanced by magnetic field competes a strong antiferromagnetic correlation in Mn sublattice which is originated in a significant Mn 3d – Yb 4f hybridization.