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

TL;DR

This study investigates SeCuO3, revealing site-selective quantum correlations through magnetic anisotropy, with a focus on its 3D tetramer network, exchange interactions, and antiferromagnetic order at low temperatures.

Contribution

It uncovers site-selective quantum correlations in SeCuO3, linking magnetic anisotropy to unique temperature-dependent g-tensors and magnetic axis rotation.

Findings

Intra-tetramer exchange interactions are approximately 200 K.

Long-range antiferromagnetic order develops at 8 K.

Unusual temperature dependence of effective g-tensors observed.

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.