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

Abstract

We present the investigation of a monoclinic compound SeCuO3 using x-ray powder diffraction, magnetization, torque and electron-spin-resonance (ESR). Structurally based analysis suggests that SeCuO3 can be considered as a 3D network of tetramers. The values of intra-tetramer exchange interactions are extracted from the temperature dependence of the susceptibility and amount to ~200 K. The inter-tetramer coupling leads to the development of long-range antiferromagnetic order at TN = 8 K. An unusual temperature dependence of the effective g-tensors is observed, accompanied with a rotation of macroscopic magnetic axes. We explain this unique observation as due to site-selective quantum correlations.

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• Triplons, Magnons, and Spinons in a Single Quantum Spin System: SeCuO3
• Unconventional field induced phases in a quantum magnet formed by free radical tetramers
• Critical spin-$\frac{1}{2}$ tetramer compound CuInVO${}_5$: Exploring the vicinity of two multimerized singlet states
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