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In order to investigate the origin of the magnetic circular dichroism (MCD) in Ga1-xMnx As, we prepared a series of paramagnetic samples with a very low Mn content (x~0.0005 and 0.0003), grown at different substrate temperatures. The samples grown at low temperatures (< 300 degC) show a sign change in the MCD, while those grown at higher temperatures (>300degC) reveal broad positive MCD spectra...
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