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We present the investigation of a monoclinic compound SeCuO3 using x-raypowder diffraction, magnetization, torque and electron-spin-resonance (ESR).Structurally based analysis suggests that SeCuO3 can be considered as a 3Dnetwork of tetramers. The values of intra-tetramer exchange interactions areextracted from the temperature dependence of the susceptibility and amount to~200 K. The inter-tetramer coupling leads to the development of long-rangeantiferromagnetic order at TN = 8 K. An unusual temperature dependence of theeffective g-tensors is observed, accompanied with a rotation of macroscopicmagnetic axes. We explain this unique observation as due to site-selectivequantum correlations.

Site-selective quantum correlations revealed by magnetic anisotropy in the tetramer system SeCuO3