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We have studied the effects of C- and Mn-substitution on physical properties of MgB 2 , using single crystals. Optical reflectivity measurements have successfully separated the changes in plasma frequency and scattering rate in σ- and π-band. The former indicates that electrons are doped by C-substitution but the two dimensional σ-band Fermi surfaces survive at least up to 10% doping. Increase...
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