Phys. Rev. Lett. 87, 097003 (2001) [4 pages]Optical Conductivity and Penetration Depth in MgB2Received 17 April 2001; published 14 August 2001 The complex conductivity of a MgB2 film has been investigated in the frequency range 4<ν<30cm-1 and for temperatures 2.7<T<300K. 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. A peak in the temperature dependence of the real part of the conductivity is detected for frequencies below 9cm-1. The superconducting penetration depth follows a T2 behavior at low temperatures. © 2001 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.87.097003
DOI:
10.1103/PhysRevLett.87.097003
PACS:
74.25.Gz, 74.25.Nf, 74.70.Ad, 74.76.-w
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