Superconducting energy gap in MgB2 film observed by infrared reflectance

Details Superconducting energy gap in MgB2 film observed by infrared reflectance Superconducting energy gap in MgB2 film observed by infrared reflectance

2001-09-25

arxiv.org/abs/cond-mat/0109449v2

Phys. Rev. B 65, 172502 (2002)

Physics

Condensed Matter

Superconductivity

5 pages, figures included

Scientific paper

10.1103/PhysRevB.65.172502

Far-infrared reflectance of a MgB2 film has been measured by Fourier-transform spectroscopy for frequencies 10 cm^{-1}<\nu <4000 cm^{-1} above and below the superconducting transition. The data provide clear experimental evidence for the onset of a superconducting gap at 24 cm^{-1} at T=5 K. On increasing temperature the gap energy increases, contrary to what is expected in isotropic BCS superconductors. The small zero-temperature gap value and its unconventional increases on increasing temperature can only be explained by a highly anisotropic or multiple gap function.

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