Optical conductivity and penetration depth in MgB2
Abstract
The complex conductivity of a MgB2 film has been investigated in the frequency range 4 cm-1< nu < 30 cm-1 and for temperatures 2.7 K < T <300 K. The overall temperature dependence of both components of the complex conductivity is reminiscent of BCS-type behavior, although a detailed analysis reveals a number of discrepancies. No characteristic feature of the isotropic BCS gap temperature evolution is observed in the conductivity spectra in the superconducting state. A peak in the temperature dependence of the real part of the conductivity is detected for frequencies below 9 cm-1. The superconducting penetration depth follows a T2 behavior at low temperatures.
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