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 T^2 behavior at low temperatures.

4 pages, 4 figures

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• MgB2 superconducting thin films with a transition temperature of 39 Kelvin
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• High-Resolution Photoemission Study of MgB2
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• Transition Spectra for a BCS Superconductor with Multiple Gaps: Model Calculations for MgB_2
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