Magnetic disorder in cupric oxide

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作者：

Departamento de Física, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, C.C. 67, 1900 La Plata, Argentina ^{[1
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来源：

Hyperfine Interact. | / 1-2卷 / 47-57期

关键词：

Ball milling - Spin glass;

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摘要：

Investigations of the abnormal magnetic properties of cupric oxide reveal discrepancies between both experimental results and theoretical explanations. Through iron-doping cupric oxide by ball-milling and thermal treatments we have been able to obtain Mössbauer results that are an experimental evidence of semi-disorder. The magnetic hyperfine field of the Cu0.995Fe0.005O solid 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 into a local canted state or of magnetic clusters in the CuO matrix.

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