Abstract
Microwave power absorption in copper-modified α-C:H films (maximum copper content, 8%) was studied in the 3.8–20 K temperature range. The EPR spectrum is interpreted as being due to a strongly anisotropic absorption of isolated paramagnetic copper centers. A model for the formation of paramagnetic copper centers involving oxygen atoms is proposed. At temperatures above 18 K, the system exhibits a nonresonance absorption of the microwave power. The temperature dependence of this absorption signal is described by an exponential law with the parameter ΔE=250±30 K. This temperature dependence is explained assuming the existence of copper nanoclusters. The ΔE value can be considered as the depth of an energy well corresponding to the nanocluster formation.
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