1208.3326 (I. Živković et al.)

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

I. Živković, D. M. Djokić, M. Herak, D. Pajić, K. Prša, P. Pattison, D. Dominko, Z. Micković, D. Cinčić, L. Forro, H. Berger, H. M. Ronnow

We present the investigation of a monoclinic compound SeCuO3 using x-ray powder di?raction, 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.

View original: http://arxiv.org/abs/1208.3326