Magnetic disorder in cupric oxide

Investigations of the abnormal magnetic properties of cupric oxide reveal d iscrepancies between both experimental results and theoretical explanations . Through iron-doping cupric oxide by ball-milling and thermal treatments w e have been able to obtain Mossbauer results that are an experimental evide nce of semi-disorder. The magnetic hyperfine field of the Cu0.995Fe0.005O s olid solution displays a spin-glass-like thermal dependence that undergoes two transitions, one at about 150 K, that can be assigned to the long-range ordering of the cupric oxide spins, and the second one at some temperature between 4.2 and 15 K, that exposes either the freezing of the Fe3+ spins i nto a local canted state or of magnetic clusters in the CuO matrix.