Infrared studies of superconducting MgB2 thin films

摘要

Reflectance of superconducting MgB2 thin films (T-c approximate to 35 K) has been measured in a broad spectral range from 30 to 110,000 cm(-1). A typical plasma edge with a reflectance minimum at 15,000 cm(-1) has been found. In the far-infrared region we observe a pronounced rise of the reflectance below 60 cm(-1), which appears below T-c and can be associated with superconducting state. The temperature-dependent complex conductivity at infrared frequencies has been determined. The real and imaginary parts of the conductivity below T-c show a temperature evolution, which is characteristic for superconducting gap opening (decrease in sigma(1) and rise in sigma(2)) (C) 2003 Elsevier Science B.V. All rights reserved. [References: 10]